hpcalc.org - HP 48 Archive

HP 48 Documentation Files

The first size listed is the downloaded file size and the second size listed is the size on the calculator.


There are 542 files totaling 205180KB in this category.

.symbol file: ROM disassembly   (details) 48 ENG   22KB
Disassembly of the ROM for programmers to use.
By Sune Bredahl. 1997/08/21

"Wicked" Directory   (details) 48 ENG   5KB
Explains a bit about the operation of the hidden directory, and shows a roundabout way to get to it on an SX.
By Eric Toonen. 2017/08/13

10 Interviews from hp-network.com   (details) 48 ENG FRA   133KB
Contains 10 interviews from the French website www.hp-network.com. Included are the interviews of Arnaud Schmidt, Bernard Parisse, Paul Courbis, Gerald Squelart, HPGandalf, HPTroll, Zoak, LuDo and SunHP. You can find new interviews on www.hp-network.com. Only the interview of Eric Rechlin is in English.
By Bebert. 2002/09/16

128 KB RAM Card PCB   (details) 48 ENG   62KB
Design for a PCB for a 128 KB RAM card.
By Erik Adler. 2017/06/11

1941 RPN Computer?   (details) 48 ENG   6KB
Article from PPC Calculator Journal (April 1980, V7 N3 P25) about the first RPN computer, from 1941.
By Paul Ceruzzi. 1998/08/24

1998 HP Handheld Conference Report   (details) 48 ENG   7KB
Report on the 1998 HP Handheld Conference in Vancouver, Washington, US.
By Jake Schwartz. 1998/09/12

41CV Emulator Card   (details) 48 ENG   5KB
Brief review of the HP 41CV Emulator Card that was sold for the 48SX.
By Joseph K. Horn. 2008/08/13

48G RAM Upgrades   (details) 48 ENG   14KB
Contains several documents telling how to go to 128K, 256K, 768K, and even 4M on the HP 48G.
Author unknown. 1998/10/29

48G/S to 256K/288K   (details) 48 ENG   42KB
Explains how to go to 256K on the HP 48G and 288K on the HP 48S.
By Thomas Otten. 1997/08/21

48GX Quick Start Guide in Greek   (details) 48   1281KB
Greek-language 89-page PDF quick start guide for the 48GX.
By John Kosmidis. 2017/03/11

48GX User's Guide in Greek   (details) 48   941KB
Greek-language 142-page PDF user guide for the 48GX.
By John Kosmidis. 2017/03/11

48S Memory Scanner Information   (details) 48 ENG   5KB
General information about the memory scanner on the 48S series.
By Jeremy Smith and Warren Furlow. 1998/04/02

48SX First Impressions   (details) 48 ENG   3KB
Some first impressions of the 48SX, from the perspective of a 28S user.
Author unknown. 2017/08/13

48SX Internals   (details) 48 ENG   9KB
Internal information about the 48SX, including SYSEVALs and the library scanner.
By Alonzo Gariepy. 1998/03/15

48SX Keyboard Input   (details) 48 ENG   13KB
Shows how to handle keyboard input in ML. Should be valid for the G series too.
By Joe Ervin. 1998/03/15

48SX Menus   (details) 48 ENG   11KB
A list of all the menus in the 48SX, numbered for input to the MENU function.
By Jake Schwartz. 2017/07/02

48SX Owner's Manuals Index   (details) 48 ENG   43KB
Index to the most important topics of the 48SX Owner's Manuals.
By Jake Schwartz. 1998/01/23

48SX vs 28S   (details) 48 ENG   17KB
A list of all the improvements in the 48SX compared to the 28S.
By Jake Schwartz. 2017/07/02

48SX/GX Keyguides   (details) 48 ENG   11KB
Handy two-page tables listing the functions of all the keys on both the S series and G series. In Microsoft Word format.
By Sterling Babcock. 2017/07/02

A Little Bit of HP History   (details) 48 ENG   7KB
Tells about what led up to the HP 49G, giving a brief history of HP calculators in 1993-1999 and the switch from Corvallis to Singapore to Australia for development.
By Jake Schwartz. 1999/05/27

AC/DC Adapter 1.0   (details) 48 ENG   186KB
Instructions telling how to make a power circuit to run the HP 48 on an AC adapter.
By Mauricio Sánchez Cruz. 2002/02/10

AddHard 48   (details) 48 ENG   1205KB
This .zip file contains a lot of information in the form of text files and pictures about opening and modifying the HP 48. It covers topics such as networking, memory upgrades, RAM cards, connection cables, and opening the case using two different methods.
Author unknown. 1997/08/21

Advanced User RPL Guide 0.12   (details) 48 ENG   14KB
This guide is for people already familiar with User RPL to the extent of the manuals. Knowledge of programming and program syntax is assumed. This is just a listing of all commands and their usage.
By Justin Dossey. 1998/06/19

Adventures of Calculator Man   (details) 48 ENG   12KB
Can an HP 48GX come alive and enslave all the TI's?
By Vimal Bhalodia. 1998/06/07

Airplane   (details) 48 ENG   3KB
Question written by a [stupid] new user of the HP 48, and a humorous reply rewriting the question in an airplane context by Joe Horn.
Author unknown. 1997/09/06

All about the System RPL word 'EXPAND'   (details) 48 ENG   2KB
Comments about EXPAND, which appends zeros onto a character string or hex string.
By Joseph K. Horn. 2008/08/13

All New HP48 FAQ!   (details) 48 ENG   5KB
Six questions about the HP 48 and its successor.
By Bill Markwick. 1998/07/24

Alphabetize a String   (details) 48 ENG   12KB
Mini Challenge to alphabetize the characters in a string, in User RPL.
Author unknown. 1998/08/17

An HP-48 RAM Card 1.0   (details) 48 ENG   2113KB
Contains the schematics and Gerber files needed to create a 128 KB RAM card for the 48SX/GX calculators. Data sheets for the parts used are also included. The Bill of Material calls out specific vendor and vendor part numbers for the passive components used, but any equivalent part in the SMD 0805 package can be substituted. Battery backup is by use of a 12 mm lithium coin cell, either the CR1216 or the CR1225. The CR1225 has the higher capacity rating of the two at 48 mAh. Although that's only half the capacity of a CR2016, the Cypress MoBL SRAM memory device only requires 1 uA in standby mode when the memory is not selected so battery life should be reasonably long.
By Mark A. Fleming. 2019/07/20

Answers to Common Questions   (details) 48 ENG   4KB
Humorous answers to common questions about the 48SX.
By Jeff Brown. 2017/08/13

Apart 48   (details) 48 ENG   11KB
Describes an alternative (less destructive) method of taking apart the HP 48.
By David Fenyes. 1997/08/21

Aphorisms for Programmers   (details) 48 ENG   6KB
Article from the PPC Journal (September 1979, V6 N6 P19) on programming aphorisms.
By Bill Kolb. 1998/08/18

Argument Checking   (details) 48 ENG   2KB
A note about System RPL argument type checking without bogus XLIB error messages.
By Joe Ervin. 2008/08/12

Army   (details) 48 ENG   3KB
Article from 65 Notes (July 1976, V3 N6 P2) on why the Army still didn't have calculators.
By Richard Kirka. 1998/08/18

Array Data Types   (details) 48 ENG   7KB
Explains the outcome of some investigations into various array data types in the 48SX.
By Conrad Winchester. 2017/08/13

ASM LE   (details) 48 FRA   152KB
Assembly language tutorial (still in progress) in PDF format.
By Sébastien Munch. 1999/05/19

Assembly Timings   (details) 48 ENG   1KB
Talks about how some assembly instructions take a different amount of time to run depending on memory address.
By Dan Kirkland. 1999/01/06

Authors   (details) 48 ENG   459KB
PostScript list of HP Journal article authors.
Author unknown. 1998/08/23

Automatic List Processing   (details) 48 ENG   2KB
Comments about automatic list processing in the G series and the CKn&Dispatch System RPL words.
By William C Wickes. 2008/08/13

Avoiding SOL/editline conflicts   (details) 48 ENG   3KB
Explains how to avoid SOL/editline conflicts, as was found in an early version of BLIND.
By Mika Heiskanen. 2008/08/12

Bad Card Data   (details) 48 ENG   1KB
A little tip on what to do if you get a "Bad Card Data" error message.
By Stephen J. Thomas. 1997/08/21

Bad Screens   (details) 48 ENG   1KB
If you are having trouble with the screen in your HP 48, you may be eligible for a free replacement.
Author unknown. 1997/08/21

Bank Switching   (details) 48 ENG   5KB
Commentary on automatic bank switching (48GX cards) versus manual bank switching (TDS cards for the 48SX).
By Joseph K. Horn. 2008/08/12

Batlife   (details) 48 ENG   10KB
Explanation of the relationship between used memory and power usage. Again, a joke.
Author unknown. 1997/09/06

Batteries   (details) 48 ENG   3KB
Do you want to know how to get more battery life? Maybe this can help.
By Joseph K. Horn. 1997/09/06

Battery Drain Information   (details) 48 ENG   4KB
Lists some things that use up more battery power. This information is provided to help you conserve battery life.
By John H Meyers. 1998/01/10

Battery Drain Table   (details) 48 ENG   6KB
Shows how much power different operations on the HP 48 take.
By Doug Cannon. 1997/08/30

Battery Drain Table #2   (details) 48 28 ENG   2KB
Compares battery usage of the HP 48 and HP 28.
By Simone Rapisarda. 1997/08/21

Battery Information   (details) 48 ENG   1KB
Explains why it is best not to use rechargeable batteries in the HP 48.
Author unknown. 1997/09/06

Battery Leak Keyboard Repair   (details) 48 ENG   338KB
Description and photos of how one person repaired a keyboard failure in a 48GX due to the batteries leaking.
By Vito Presicci. 2008/08/09

Beep Frequencies   (details) 48 ENG   18KB
An analysis of the way the 48SX produces beeps, and side effects that can be noticed due to the implementation.
By Eric T. Lane and Joe Ervin. 2017/07/02

Bestfit Bug   (details) 48 ENG   2KB
Details on the BESTFIT bug on GX revisions M-P.
By Boris Ivanovic. 1998/01/10

Bitwise Operators   (details) 48 ENG   2KB
Explains how to do OR, NOT, and XOR in assembly language
By Detlef Müller. 2008/08/12

Brazo (Arm)   (details) 48 ESP   4KB
Shows how one could possibly write a program to control a robot arm.
By José M. Alarcón Aguin. 1998/04/16

Brazo in English   (details) 48 ENG   2KB
Shows how one could possibly write a program to control a robot arm.
By José M. Alarcón Aguin. 1998/09/28

Broken Reset Button   (details) 48 ENG   2KB
If your reset button breaks, this is how to reset your calculator.
By Dave Arnett. 1999/01/06

Buglist   (details) 48 ENG   9KB
Discussion of early bug reports about the HP 48SX and the fixes for the actual bugs.
By William C Wickes. 2008/08/12

Built-In CRC   (details) 48 ENG   1KB
Some notes about the 48's built-in hardware CRC.
By Alonzo Gariepy and others. 2008/08/13

Buzz   (details) 48 ENG   5KB
The real reason why the HP 48's keyboard buzzes.
By John H Meyers. 1998/06/12

Cable Connector Info   (details) 48 ENG   3KB
Gives specific information about the connector from the HP 48 Serial Interface Kit.
By Mark Adler. 1998/02/28

CalcCompare2003 1.1   (details) 48 ENG DEU   276KB
Included are two PDF tables (English and German) with an equipment comparison between the HP 49G and some comparable 2003 graphic calculators from Casio (CFX-9850GB+, Algebra FX 2.0+, ClassPad 300), Sharp (EL-9650, EL-9900, PC-E500S) and TI (89, Voyage 200).
By Dirk Duetemeyer. 2003/05/08

Calculator Command Comparison Sheet 2.00   (details) 49/50 48 28 ENG   279KB
A command comparison sheet of HP symbolic RPN calculators, containing a description of every command. Covers the HP 28C, 28S, 48S/SX, 48G/G+/GX, and 49G/48gII/49g+. The sheet is color coded based on the model for easy reading. In Excel format but also compatible with OpenOffice and Pocket Excel.
By Veli-Pekka Nousiainen. 2005/05/24

Calculator Comparison 5   (details) 49/50 48 28 ENG   5KB
Compares the HP 49 with the 48GX, 48G+, 48G, 48SX, 48S, 28S, and 28C.
By Veli-Pekka Nousiainen. 2000/09/21

Card Not Full   (details) 48 ENG   2KB
Humorously explains that the HP Equation Library card is not fully using the card's capacity because it was write-protected.
Author unknown. 2008/08/12

Card Pins   (details) 48 ENG   3KB
Pinouts of the HP 48SX and GX card slots.
By Joel Kolstad. 1999/01/06

Cartão de Memória   (details) 48 POR   207KB
Diagrams for constructing a 128 KB memory card.
By Eduardo Artur Cunha. 2017/07/29

Clock Jitter   (details) 48 ENG   1KB
Information on noise in the HP 48 quartz timing crystal.
By Dave Arnett. 1999/01/06

Closest Integer in a List   (details) 48 ENG   4KB
Mini Challenge to find the closest integer in a list to a given integer, in User RPL.
Author unknown. 1998/08/17

CMT Memory Card Information   (details) 48 ENG   8KB
Information about using CMT-brand RAM cards in the HP 48.
By Stephen J. Thomas. 1997/09/06

Common Voyager Questions and Answers   (details) 48 ENG   4KB
Common questions and answers about Voyager, an old tool for DOS for disassembling 48 software.
By Joseph K. Horn. 2008/08/12

Como fazer o cabo 1.0   (details) 48 POR   6KB
With this document you will build and improve your HP 48-PC cable. The HP-PC cable allows you to get programs from your computer and transmit to your HP.
By Marcos Peres. 2001/05/18

comp.sources.hp48 Posting Information   (details) 48 ENG   17KB
A little out of date now and only here for historical reasons, but it contains posting information for comp.sources.hp48 along with source code for SHIP.
Author unknown. 1998/01/12

Compiling a String   (details) 48 ENG   3KB
Explains several methods of compiling a string into an object, and lists advantages and disadvantages of each.
By John H Meyers. 1998/08/29

Complete List of HP 48G Series Messages   (details) 48 ENG ESP   11KB
HP 48G messages listed numerically. All messages are listed. ASCII Document.
By Jordi Hidalgo. 2000/09/13

Complex Numbers Marathon 1.5   (details) 49/50 48 ENG   971KB
Detailed documentation of the algebraic and graphics capabilities of the HP 49G working with complex quantities. New orthographically corrected version. The ZIP archive includes all programs of the marathon.
By Nick Karagiaouroglou. 2003/06/30

Complex Units   (details) 48 ENG   2KB
Questions and answers about imaginary units.
By William C Wickes. 2008/08/17

Connect HP48 via IR   (details) 48 ENG   6KB
This document explains how to connect your HP 48 series to your computer through an IR device (originally written for an HP notebook).
By Bora. 2002/01/21

Constants   (details) 48 ENG   5KB
Lists memory locations of many constants in the 48SX ROM.
By Jan Brittenson. 1998/04/01

Converting Vectors To Array   (details) 48 ENG   3KB
Gives several examples of how to convert two vectors to an array.
By Jan Brittenson, Scott Burke, Ruben Rostamian and others. 2008/08/12

Copying Protected Libraries   (details) 48 ENG   4KB
Shows how to use a SYSEVAL to extract libraries from read-only cards, which otherwise cannot be recalled with the RCL command.
Author unknown. 2017/07/02

Corso 1.10   (details) 48 ITA   122KB
User RPL tutorial in HTML format.
By Salvatore Miano. 1999/06/11

Cours sur les tables de caractères   (details) 48 FRA   2KB
Explains how to make and use a table of characters in assembly language. Includes a sample program.
By Axkiller49. 2001/06/16

CPU Bug   (details) 48 ENG   2KB
Comments about a bug in the Saturn CPU affecting instructions like A=A+CON fs,expr.
By Dan Kirkland. 2008/08/13

CRC Information   (details) 48 ENG   3KB
Contains information about how the checksums for objects are determined and gives two C routines to calculate them.
By Alonzo Gariepy and Dave Kaffine. 1998/06/09

Creating Built-In Functions   (details) 48 ENG   1KB
Given x and F on the stack, where x is any argument, and F is a function of one argument (user-defined or built-in), this shows how to get 'F(x)'
By William C Wickes. 2008/08/12

Creating Unallowed Names   (details) 48 ENG   2KB
Explains how to create disallowed names using SYSEVALs.
By Rick Grevelle. 1997/08/21

Creating Your Own HP48.MEM File   (details) 48 ENG   7KB
Explains how to create your own HP48.MEM file for use with the obsolete Voyager tool.
By Joseph K. Horn. 2008/08/17

Curso de Programação HP 48G/GX   (details) 48 POR   147KB
Course in Adobe PDF format on programming the HP 48 in User RPL.
By Anderson Juarez Moreira and Luciano da Silva Ribas. 1998/11/15

Curso de programacion en User RPL 1.0   (details) 49/50 48 ENG   620KB
Guide for programming in User RPL on both the 48 and 49. Written in Spanish and in PDF format. Includes examples related to civil engineering.
By Sandro Choque Martinez. 2006/08/28

Curso de Programcion UserRPL en español 1.0   (details) 48 ESP   62KB
Tutorial about programming User RPL in Spanish.
By Luis M. Gallardo. 2003/07/19

Cute HP 48 Bug   (details) 48 ENG   1KB
Comments about a bug in the 48 that lets you enter system binaries from the command line.
By John Paul Morrison. 2008/08/13

Cybersnobs   (details) 48 ENG   9KB
Article from 65 Notes (July 1976, V3 N6 P2) on cybersnobbery.
By Craig Pearce. 1998/08/18

Cycles   (details) 48 ENG   26KB
Cycle counts of various assembly language instructions on the 48GX.
By Mika Heiskanen. 1998/02/22

Cycles du Saturn 2.0   (details) 49/50 48 39/40 FRA   55KB
Listing of cycle counts for the Saturn CPU.
By Julien Angeli (telchar). 2001/12/02

Data Entry Information in Spanish   (details) 48 ESP   38KB
Explains how to do data entry in programs.
By Mario de Lama. 1998/02/22

Dave's ROM Dump Copying Comments   (details) 48 ENG   5KB
Comments on the moral issues of copying ROM dumps.
By Dave Arnett. 1999/01/06

Digital Oscilloscope   (details) 48 ENG   29KB
PostScript file of documentation for a digital scope using an HP 48 and a Motorola HC11 microprocessor kit.
By Bill Madden. 1997/08/21

Display Memory Addresses   (details) 48 ENG   3KB
Explains how to access display memory in ML.
By Jan Brittenson. 1997/08/21

Do It Yourself RAM Card   (details) 48 ENG   989KB
Schematics for building a RAM card in Adobe PDF format. Also includes photos and a screenshot of one possible PCB layout.
By Marcel Flipse. 1999/05/12

DoInputForm Tutorial   (details) 48 ENG   10KB
Explains how to create inform menus in System RPL. Document in Word 6.0/95 format.
By Han Duong (HPSolo). 1998/07/09

DomeHP00.txt   (details) 48 ENG   2KB
Description file to go with the DomeHP images.
By Andrea Domenichini. 1997/08/21

DomeHP01.jpg   (details) 48 ENG   86KB
Complete image of the ORIGINAL internal top part of the opened HP 48G.
By Andrea Domenichini. 1997/08/21

DomeHP02.jpg   (details) 48 ENG   60KB
Complete image of the ORIGINAL internal bottom part of the opened HP 48G.
By Andrea Domenichini. 1997/08/21

DomeHP03.jpg   (details) 48 ENG   39KB
Zoomed-in vision of the RAM/ROM original part of the HP.
By Andrea Domenichini. 1997/08/21

DomeHP04.jpg   (details) 48 ENG   25KB
Very zoomed-in vision of the added SMD 74HC00.
By Andrea Domenichini. 1997/08/21

DomeHP05.jpg   (details) 48 ENG   81KB
Complete image of the UPGRADED internal top part of the opened HP 48G.
By Andrea Domenichini. 1997/08/21

DomeHP06.jpg   (details) 48 ENG   62KB
Complete image of the UPGRADED internal bottom part of the opened HP 48G.
By Andrea Domenichini. 1997/08/21

DomeHP07.jpg   (details) 48 ENG   12KB
Very zoomed-in external vision of the added dip-switch under top-left rubber foot, which serves to swap between Read/Write and Only Read State of the second 128kB chip.
By Andrea Domenichini. 1997/08/21

Dueling Lawyers   (details) 48 ENG   6KB
Press release from the PPC Journal (July 1978, V5 N6 P4) from Hewlett Packard announcing the new HP-67.
Author unknown. 1998/08/18

Editor Plus Notes 2.0   (details) 48 ENG   4KB
Explains how to use Editor Plus, exploring the configuration object PluS (in the hidden directory), plus how to remove PLUS from CST.
By Brian Kelley. 2017/05/14

EduCALC   (details) 48 ENG   6KB
Article explaining why EduCALC went out of business.
By Joseph K. Horn. 1999/07/12

EduCALC HP 48 Programming Class Student Challenges   (details) 48 ENG   4KB
List of 6 "Mini Challenges" along with solutions from the EduCALC weekly programming classes in the mid-1990s.
By Joseph K. Horn. 2008/08/13

EduCALC Product List   (details) 48 ENG   11KB
Listing of EduCALC's HP 48 products and prices from late 1990 and early 1991. Interesting to see the 48SX sell for $275 and other high prices...
Author unknown. 1998/01/12

EduCALC Technical Notes   (details) 48 ENG   93KB
Fourteen documents about the HP 48 involving programming and other topics by EduCALC.
Author unknown. 1997/10/15

Entering Machine Code   (details) 48 ENG   5KB
Shows how to enter machine code directly on to the HP 48.
By Adam Kao. 1998/03/15

Equation Library Card Review   (details) 48 ENG   3KB
A brief overview of the Equation Library Card produced for the 48SX (and built-in to the 48G series).
By Dave Seaman. 2017/08/13

Errata for the 48SX Manual   (details) 48 ENG   24KB
Lists all the mistakes and the corresponding corrections for the 48SX manual.
Author unknown. 2017/08/13

Expanding RAM in the G   (details) 48 ENG   11KB
Yet another 48G opening/RAM expansion guide.
By Paul Smith and others. 1997/08/21

External Keyboard 1.1   (details) 48 ENG   690KB
Explains how to build an external keyboard for the HP 48.
By Nacho Vialta. 2003/12/27

External Power Jack   (details) 48 ENG   8KB
Shows how to put an external power jack into the HP 48 for plugging in an AC adapter or any other external power supply. Great feature to add if you're upgrading the memory of your S or G!
By Carles Albert Vallvè Guionnet. 1997/10/25

External Power Jack (HTML)   (details) 48 ENG   16KB
Shows how to put an external power jack into the HP 48 for plugging in an AC adapter or any other external power supply. This file is more comprehensive than the above file, and is in HTML format.
By Carles Albert Vallvè Guionnet. 1998/02/25

Flag -34   (details) 48 ENG   1KB
An important note about flag -34, where the manual is wrong.
By Tony Duell. 2008/08/16

Flag Listing   (details) 48 ENG   4KB
Lists what flags are used by what programs for the HP 48.
By Joseph K. Horn. 1997/08/21

Frequency   (details) 48 ENG   6KB
Article from 65 Notes (October 1977, V4 N8 P7) on Frequency. By HP-65 User's Club Member #1507.
Author unknown. 1998/08/18

Full Path   (details) 48 ENG   4KB
Discussion of how to execute a variable in another path and then return.
By David J Fred and others. 2008/08/16

Fundamentos de User RPL   (details) 48 ESP   865KB
Well-formatted introduction to User RPL. In Adobe PDF format.
By Marcos Navarro. 2011/07/24

G Series ROM Versions   (details) 48 ENG   4KB
Lists the ROM versions used in the G series and the bugs that each of them have.
Author unknown. 1997/08/21

Gamma   (details) 48 ENG   2KB
Introduction to the Gamma function.
By Eric Postpischil. 2008/08/16

Garbage Collection   (details) 48 ENG   4KB
Explains exactly how garbage collection works.
By Joe Ervin. 2008/08/16

Garbage Collection During PUSH   (details) 48 ENG   2KB
Explains garbage collection during PUSH.
By James Unterburger. 2008/08/16

General Info about Learning Remotes   (details) 48 ENG   5KB
General information on making learning remote controllers.
By Julian Taplin. 1998/01/10

General Memory Info   (details) 48 ENG   1KB
General information on the 48GX memory structure.
By Dave Arnett. 1998/01/03

GOTO   (details) 48 ENG   2KB
Talks about the System RPL "GOTO" command.
By Joseph K. Horn. 2008/08/16

Greek Documentation   (details) 48 ENG   2230KB
Documentation for the HP 48G Series in Greek, based on HP's Quick Start Guide and User's Guide.
By Hewlett-Packard and others. 2006/11/24

Grob Bug   (details) 48 ENG   2KB
Explains a bug related to grobs, that can cause a Memory Clear when attempting to create a grob with one dimension over about a million pixels.
By John Paul Morrison. 2008/08/16

Grob Encoding Information 1.0   (details) 49/50 48 ENG   1KB
Documentation on how grobs are encoded in hexadecimal on the HP 48/49.
By Ciro Mies de Souza. 2001/12/20

GROB Format   (details) 48 ENG   2KB
An explanation of the binary object format of GROB graphics objects.
By William C Wickes. 2017/08/13

Guide to the HP48GX Hardware   (details) 48 ENG   64KB
Detailed information about the HP 48GX with pictures. HTML and Text versions.
By Philippe Teuwen. 1998/07/27

GX RAM variables   (details) 48 ENG   11KB
Lists some of the GX RAM variable addresses to help you convert programs designed for the S series to run on the G series.
By Mika Heiskanen. 2008/08/17

GXBROWSR 1.2   (details) 48 ENG   11KB
This describes how to use the HP 48 built-in browser in your own System RPL programs.
By Ludvik Krulik. 1997/08/21

Handi-Calc   (details) 48 ENG   47KB
Article explaining why Handi-Calc went out of business and HP's poor business practices. In Adobe PDF format.
By Richard Nelson and Jim Lawson and others. 2000/02/20

Hardware Registers   (details) 48 ENG   3KB
Explains the bit uses of the hardware registers.
By Julian Taplin. 2008/08/16

Hiss   (details) 48 ENG   3KB
Explains the "hiss" that comes out of the HP 48 keyboard.
By Dave Arnett. 2008/08/17

Hiss   (details) 48 ENG   5KB
An alternate explanation for the "hiss" that comes out of the HP 48 keyboard.
By John H Meyers. 2008/08/17

How To Build A Radio Module 1.0   (details) 49/50 48 39/40 ENG FRA   247KB
Documentation that explains how to build a radio module.
By Bebert and Yoann Désir. 2001/08/19

How to Find the Variables in 'EQ'   (details) 48 ENG   2KB
Explains how to find the variables in EQ on a 48.
By Joseph K. Horn. 2008/08/13

How to make a 128K RAM Card   (details) 48 ENG   635KB
This file has pictures and documentation explaining how to make a 128K RAM card for the HP 48.
By Olaf. 1997/10/25

How to Make Grayscale Grobs   (details) 48 ENG   4KB
Explains how to make grayscale grobs.
By Ricardo Miller. 1997/08/21

How to open your HP48   (details) 48 ENG   10KB
This has basic information about opening the 48G/S.
By Paul Smith. 1997/08/21

How to use Jazz with Jim Donnelly's Book   (details) 48 ENG   6KB
Explains how to use Jazz for programming the examples in Jim Donnelly's book "An Introduction to HP 48 System RPL and Assembly Language Programming".
By Joseph K. Horn. 2008/08/13

How's and Why's to the HP 48 Lobotomization   (details) 48 ENG   20KB
Information about the HP 48's memory.
By Steve Sousa. 1999/06/30

How2Open   (details) 48 ENG   1682KB
This is a tar'ed, gzip'ed file of the HTML document how2open.htm, and the jpegs that go with it giving illustrated instructions on how to open your HP 48 by making cuts from the back, severing rivets inside the case.
By Adrian Drury. 1997/08/21

HP 28 to HP 48 Changes   (details) 48 ENG   5KB
A discussion of some of the differences between the HP 28 and the HP 48.
By William C Wickes. 2008/08/13

HP 28S to HP 48SX Transitions   (details) 48 ENG   16KB
A summary of functional differences of 28S operations as implemented on the 48SX. It is not intended to present all of the many improvements and new commands in the 48, but is primarily an aid for 28 users who wish to use their previously-developed programs on the 48. The comments on any given topic are not exhaustive, but are quick summaries of operational differences.
By Stephen J. Thomas. 2017/07/02

HP 41CV Emulator Application Card Overview   (details) 48 ENG   18KB
A comprehensive review of the HP82210A HP 41CV Emulator Application Card for the 48SX.
By Stephen J. Thomas. 2017/08/13

HP 42S Memory Scanner   (details) 48 ENG   2KB
Explains how to access the memory scanner on the HP 42S.
By Jay B. Harlow. 1998/04/02

HP 48 Cartridge 2.0   (details) 48 ENG POR   121KB
Document explaining a way to upgrade the HP 48 using a NVRAM, Non Volatile RAM (that is, it still keeps data even when there's no power) of 128K from Texas Instruments Corp to make something like a external cartridge. The great advantage of this is that these NVRAM chips can be obtained for free, as TI has a samples program.
By Jonathan B Araujo Neto. 2001/04/15

HP 48 Catalog   (details) 48 ENG   1KB
A small example of how the standard catalog configuration can be used to view a catalog of random strings.
By Jan Brittenson. 2008/08/17

HP 48 Currents   (details) 48 ENG   4KB
Shows current draws of the HP 48SX during various operations.
By Doug Cannon. 1997/08/21

HP 48 FAQ 4.46 em Português (Aug. 7, 1997)   (details) 48 POR   118KB
Portuguese translation of the HP 48 FAQ. Before asking a question about the HP 48, read the FAQ first. It is the number two source of information about the HP 48 (after the user's manual, of course), and everyone should get a copy of this Frequently Asked Questions list. Text version.
By André Schoorl and Carlos Marangon. 1998/07/01

HP 48 FAQ en Español 4.47 (Sept. 8, 1997)   (details) 48 ESP   126KB
Spanish translation of the HP 48 FAQ. Before asking a question about the HP 48, read the FAQ first. It is the number two source of information about the HP 48 (after the user's manual, of course), and everyone should get a copy of this Frequently Asked Questions list. HTML version.
By André Schoorl and Alejandro Arrieta (HPMaster). 1998/04/15

HP 48 FAQ HTML Edition 4.62 (April 14, 2000)   (details) 48 ENG   145KB
Before asking a question about the HP 48, read this first. It is the number two source of information about the HP 48 (after the user's manual, of course), and everyone should get a copy of this Frequently Asked Questions list. HTML version. If you'd prefer to read the FAQ online, click here.
By André Schoorl. 2000/05/13

HP 48 FAQ PDF Edition 4.62 (April 14, 2000)   (details) 48 ENG   419KB
Before asking a question about the HP 48, read this first. It is the number two source of information about the HP 48 (after the user's manual, of course), and everyone should get a copy of this Frequently Asked Questions list. Adobe PDF version.
By André Schoorl. 2000/05/13

HP 48 FAQ PostScript Edition 4.62 (April 14, 2000)   (details) 48 ENG   255KB
Before asking a question about the HP 48, read this first. It is the number two source of information about the HP 48 (after the user's manual, of course), and everyone should get a copy of this Frequently Asked Questions list. PostScript version.
By André Schoorl. 2000/05/13

HP 48 FAQ SGML Source 4.62 (April 14, 2000)   (details) 48 ENG   118KB
Before asking a question about the HP 48, read this first. It is the number two source of information about the HP 48 (after the user's manual, of course), and everyone should get a copy of this Frequently Asked Questions list. SGML source, for easy conversion into many different formats.
By André Schoorl. 2000/05/13

HP 48 FAQ Text Edition 4.62 (April 14, 2000)   (details) 48 ENG   121KB
Before asking a question about the HP 48, read this first. It is the number two source of information about the HP 48 (after the user's manual, of course), and everyone should get a copy of this Frequently Asked Questions list. ASCII text version.
By André Schoorl. 2000/05/13

HP 48 Graphics   (details) 48 ENG   6KB
Review on R. Ray Depew's "HP 48 Graphics." This is the S/SX version of the above book.
By David Porter. 1998/08/22

HP 48 I/O Technical Interfacing Guide PDF   (details) 48 ENG   122KB
This document gives HP 48 hardware information required to connect serial devices to the wired (serial) I/O port or to communicate with the HP 48 via the 2-way infrared (IR) I/O port. In PDF format.
By Hewlett-Packard. 2001/06/24

HP 48 I2C Interface   (details) 48 ENG   543KB
I2C interface demonstrated at the 1997 London HP conference. Contains the program listings (both for the HP 48 and the PIC microcontroller) and the source of the manual in LaTeX. Tar/GZip archive containing files with Unix EOL characters.
By Tony Duell. 1997/09/29

HP 48 I2C Interface   (details) 48 ENG   543KB
I2C interface demonstrated at the 1997 London HP conference. Contains the program listings (both for the HP 48 and the PIC microcontroller) and the source of the manual in LaTeX. PKZip archive containing files with MS-DOS EOL characters.
By Tony Duell. 1997/09/29

HP 48 Repair   (details) 48 ENG   4971KB
Contains documentation and 45 photographs explaining how to open the HP 48 series for repair, including tips on repairing screen and keyboard problems.
By Han Duong (HPSolo). 2005/12/01

HP 48 Schematics 1.6   (details) 48 ENG   286KB
Adobe Acrobat PDF file of the HP 48's schematics (1.6) and circuit board diagram (1.0).
By Marcel Flipse. 2019/10/25

HP 48 Speed   (details) 48 ENG   3KB
Explains the relation between temperature and the speed of the HP 48.
Author unknown. 1997/09/06

HP 48 USENET archive   (details) 48 ENG   117KB
Archive of posts related to the HP 48 in comp.sys.handhelds in 1990.
Author unknown. 1997/09/21

HP 48 USENET software archive   (details) 48 ENG   133KB
Archive of software related to the HP 48 posted to comp.sys.handhelds in 1990.
Author unknown. 1997/08/21

HP 48 Workshop   (details) 48 ENG   33KB
"Moving Up to the HP 48 Calculator Workshop" aimed at surveyors who are moving up from another HP calculator, with a focus on User RPL programming. In MS Word format.
By Richard Stanaway. 2000/03/18

HP 48G AUR Command Reference   (details) 48 ENG   294KB
Lists the commands contained in the Advanced User's Reference and shows their stack syntax.
By Adrian Drury. 1998/06/23

HP 48G Series Advanced User's Reference Manual   (details) 48 ENG   10KB
Review on Hewlett Packard's "HP 48G Series Advanced User's Reference Manual" (AUR).
By Jarno Peschier. 2000/03/25

HP 48G Series Advanced User's Reference Manual   (details) 48 ENG   36933KB
Complete copy of the fourth edition of the HP 48G Series Advanced User's Reference Manual. This PDF document has 764 pages and was scanned at 300 dpi color by an unknown individual. I cleaned up the several hundred megabytes of scanned images and converted them into into a relatively compact black and white PDF file.
By Hewlett-Packard. 2004/05/11

HP 48G Series Quick Start Guide   (details) 48 ENG   3838KB
Complete copy of the fifth edition of the HP 48G Series Quick Start Guide. This PDF document has 116 pages and was scanned from the original book.
By Hewlett-Packard. 2012/12/26

HP 48G Series User's Guide   (details) 48 ENG   16394KB
Complete copy of the eighth edition of the 48G series instruction manual. This PDF document has 612 pages and was scanned by me at 300 dpi monochrome. Fully bookmarked in order to easily jump between sections. Included on this site with the permission of HP tech support.
By Hewlett-Packard and Eric Rechlin. 2000/09/07

HP 48GX Tutorial in Portuguese 1.02   (details) 48 POR   59KB
Explains how to use the HP 48GX. 31 page Word-document.
By Ricardo Sales. 2000/11/08

HP 48SX Bugs and Fixes   (details) 48 ENG   8KB
A list of possible bugs seen in the 48SX Revision D ROM, and an answer from an HP engineer.
By Eric Toonen and William C Wickes. 2017/08/13

HP 48SX Expansion Port Pinouts   (details) 48 ENG   3KB
Explains the purpose of all the pins in the expansion port card slot of the 48SX.
By Gary Friedman. 2017/08/13

HP 48SX Feature Summary   (details) 48 ENG   5KB
A summary of all the features in the 48SX.
By Wlodek Mier-Jedrzejowicz. 2017/08/13

HP 48SX Hardware Registers Document 1.0   (details) 48 ENG   4KB
Lists the hardware registers of the HP 48SX.
By Julian Taplin. 1997/08/21

HP 48SX Internals   (details) 48 ENG   27KB
Describes some of the internals of the HP 48SX calculator from a variety of sources, including the HP-71B Internal Design Specifications, ROM analysis and other posted information. Its intended audience is people with a good understanding of the basic HP 48SX who want to explore the internals of the HP 48SX. Goes into depth about object types and important memory addresses.
By Derek S. Nickel. 2017/06/11

HP 48SX Keyboard Replacement and LCD Upgrade   (details) 48 ENG   25083KB
Shows how to open a 48SX, replace its keyboard, and upgrade the LCD to a black-and-white-one from a 39G. In PDF format.
By Sanjeev Visvanatha. 2019/04/22

HP 48SX Notes   (details) 48 ENG   2KB
Some observations about the HP 48SX and its differences from previous HP calculators.
By Dan Allen. 1998/04/06

HP 48SX Remarks   (details) 48 ENG   6KB
Some initial remarks about the 48SX made after its announcement but before its release.
By William C Wickes. 2017/08/13

HP 48SX Review   (details) 48 ENG   7KB
A review of the 48SX written in 1991.
By Dan Allen. 2017/08/13

HP Calc Command Comparison   (details) 48 28 ENG   18KB
Comparison of the HP 75C, 71B, 28S, 42S, and 48SX commands in MS Works spreadsheet format.
Author unknown. 1998/04/18

HP Calculator History   (details) 48 ENG   6KB
Lists code names and prices of nearly every HP calculator, from the 35 to the 48.
By Dan Allen. 1997/08/21

HP Calculator Manuals   (details) 48 ENG   3KB
Slightly-paraphrased excerpt from the first page of older HP calculator manuals, and a "translated" (from legalese) first page of newer calculator manuals.
By Joseph K. Horn. 1998/09/12

HP Database   (details) 48 ENG   458KB
Information about every HP calculator ever made.
By Craig A. Finseth. 2017/07/09

HP Handheld Serial Ports   (details) 48 ENG   245KB
Excel spreadsheet showing pinout diagrams for the serial ports in several HP handheld devices (the 48, the 38/49, and the 200LX), as well as the standard RS-232 pinouts and how they map to the HP serial cables.
By Thomas Chrapkiewicz. 2017/05/28

HP Handheld User's Conference 1999   (details) 48 ENG   7KB
Programming challenge from the 1999 HP Handheld User's Conference to write a program to adjust the time in hours, minutes, and seconds.
Author unknown. 1999/08/27

HP Handhelds of the 1980s   (details) 48 ENG   24KB
A high-level overview comparing the functionality of the high-end calculators introduced by HP in the 199th decade AD -- the 75, the 71, the 28, the 42S, and the 48SX. Also includes a tab-separated-values list comparing the functions built into each calculator.
By Dan Allen. 2017/07/02

HP Inside   (details) 48 ENG   1KB
Description file to go with the images below.
By KENDY. 1997/08/21

HP Inside 1   (details) 48 ENG   79KB
Disassembled HP 48, whole view.
By KENDY. 1997/08/21

HP Inside 2   (details) 48 ENG   100KB
HP-board with 256K-PCB, top view.
By KENDY. 1997/08/21

HP Inside 3   (details) 48 ENG   104KB
HP-board with 256K-PCB, right side.
By KENDY. 1997/08/21

HP Inside 4   (details) 48 ENG   62KB
Bottom of HP case + R/W dip-switch.
By KENDY. 1997/08/21

HP Inside 5   (details) 48 ENG   122KB
HP-board, GX (!) model, top view.
By KENDY. 1997/08/21

HP Inside 6   (details) 48 ENG   112KB
HP-board, GX (!) model, slot-detail.
By KENDY. 1997/08/21

HP Journal article on the HP 48GX (PDF)   (details) 48 ENG   196KB
HP Journal article from August 1994 on the HP 48GX in Adobe PDF format. Copyright Hewlett Packard, distributed with permission.
By Hewlett-Packard. 1998/03/15

HP Journal article on the HP 48GX (PS)   (details) 48 ENG   526KB
HP Journal article from 1994 on the HP 48GX in PostScript format. Copyright Hewlett Packard, distributed with permission.
By Hewlett-Packard. 1998/03/15

HP Journal article on the HP 48SX (PDF)   (details) 48 ENG   9119KB
HP Journal article from June 1991 on the HP 48SX in Adobe PDF format. Copyright Hewlett Packard, distributed with permission.
By Hewlett-Packard. 2017/02/25

HP SoundBooster   (details) 48 ENG   623KB
Schematics for a combination 1MB RAM card and sound card. In Adobe PDF format.
By Marcel Flipse. 2000/01/28

HP Tools Documentation   (details) 48 ENG   194KB
Documentation for HP's programming tools in Microsoft Word 2.0 format.
Author unknown. 1997/08/21

HP-01   (details) 48 ENG   6KB
Advertisement/announcement from Scientific American (September 1977) for the HP-01 calculator-watch.
Author unknown. 1998/08/27

HP-25 Printer   (details) 48 ENG   6KB
Article from the PPC Journal (September/October 1978, V5 N8 P5) on 'printing' with an HP-25.
By Justus A. Villa. 1998/08/18

HP-65 in Space   (details) 48 ENG   5KB
Press release from 65 Notes (July 1975, V2 N6 P7) announcing the use of the HP-65 in space.
By Hewlett-Packard. 1998/08/18

HP-Minitel Cable   (details) 48 FRA   2KB
Explains how to make an HP 48 to Minitel cable.
Author unknown. 1997/08/21

hpc Vol. 4 Num. 1   (details) 48 38 ENG   267KB
Newsletter for educators about HP calculators from April, 1998. This issue covers the HP 48G+, HP 38G ApLets, and some general HP calculator information.
By Grapevine Publications. 1998/10/10

hpc Vol. 4 Num. 2   (details) 48 38 ENG   220KB
Newsletter for educators about HP calculators from September, 1998. This issue covers calculators on the AP Calculus exam, HP 38G ApLets, and some general HP calculator information.
By Grapevine Publications. 1998/10/10

hpc Vol. 5 Num. 1   (details) 48 38 ENG   193KB
Newsletter for educators about HP calculators from January, 1999. This issue covers defining functions, Taylor polynomial approximation, exponential decay, and general HP calculator information.
By Grapevine Publications. 1999/06/30

hpc Vol. 5 Num. 2   (details) 48 38 ENG   536KB
Newsletter for educators about HP calculators from April, 1999. This issue covers animated Taylor polynomials, visualizing the pivot from derivative to integral, polar plots, and general HP calculator information.
By Grapevine Publications. 1999/06/30

hpc Vol. 5 Num. 3   (details) 49/50 48 38 ENG   543KB
Newsletter for educators about HP calculators from September, 1999. This issue covers the 49G, Taylor polynomials, polar plots, and general HP calculator information.
By Grapevine Publications. 1999/10/07

hpc Vol. 6 Num. 1   (details) 49/50 48 38 ENG   846KB
Newsletter for educators about HP calculators from January, 2000. This issue covers combinatorials, menus, coordinate geometry, limits, and general HP calculator information.
By Grapevine Publications. 2000/06/20

hpc Vol. 6 Num. 2   (details) 49/50 48 39/40 ENG   872KB
Newsletter for educators about HP calculators from April, 2000. This issue covers the 39G, the 30S, histograms and probability, maximizing volume, recipes, units and key assignments, confidence intervals, and general HP calculator information.
By Grapevine Publications. 2000/06/20

hpc Vol. 6 Num. 3   (details) 49/50 48 39/40 ENG   670KB
Newsletter for educators about HP calculators from August, 2000. This issue covers the Xpander, factoring on the 39G, sequences on the 30S, derivatives on the 49G, and general HP calculator information.
By Grapevine Publications. 2000/09/01

HP48 I/O Technical Interfacing Guide   (details) 48 ENG   24KB
This document gives HP 48 hardware information required to connect serial devices to the wired (serial) I/O port or to communicate with the HP 48 via the 2-way infrared (IR) I/O port.
By Hewlett-Packard. 1997/08/21

HP48 Machine Language Starter Kit   (details) 48 ENG   153KB
Set of documentation and example code that would have been good for a beginning 48SX machine language programmer back in 1991.
By Joe Ervin, Jake Schwartz, and Derek S. Nickel. 2017/06/11

HP48G 32KB to 640KB Upgrade 2.0   (details) 48 ENG   323KB
Small PDF document describing a 32KB to 640KB upgrade on a 48G with instructions and photos.
By Joao Carlos Rodrigues Barbosa. 2001/12/20

HP48G128   (details) 48 ENG   189KB
Picture of a HP 48G circuit board on a workbench, with 128 K of RAM (using SMD RAM chips). Also faster than normal.
Author unknown. 1997/08/21

HP48GX Battery Usage   (details) 48 ESP   6KB
Information about the battery usage of many different functions on the 48GX.
By cvag@tinet.fut.es. 1998/01/10

HP48GX Bug   (details) 48 ENG   4KB
Explains a bug in the G/GX, rev K-P that causes a Memory Clear when doing statistics (I tried it, it's real!).
By Joseph K. Horn. 1997/08/21

HP48SX + 128 K   (details) 48 ENG   53KB
Photos (and a very brief explanation) of a 48 SX upgrade with a 128 K SRAM.
By Istvan Totka. 2003/01/10

HP82240B Printer Communication Information   (details) 48 ENG   3KB
Information about the format of data sent to the HP82240B infrared printer.
By Jarno Peschier. 1997/09/06

HP82240B Technical Interfacing Guide PDF   (details) 48 ENG   74KB
This document gives comprehensive information about communicating with the HP 82240B infrared printer. In PDF format.
By Hewlett-Packard. 2001/06/24

HPAUSB_1   (details) 48 DEU   115KB
Side view of an HP 48G circuit board on a workbench that has been upgraded to 384K, using two stacked DIP chips.
Author unknown. 1997/08/21

HPAUSB_2   (details) 48 ENG   214KB
Top view of an HP 48G circuit board on a workbench that has been upgraded to 384K, using two stacked DIP chips.
Author unknown. 1997/08/21

HpIrDA   (details) 48 39/40 38 ENG   2KB
Document about the basics of the HP calculator and PC IrDA infrared port communication.
By Christoph Gießelink. 2001/10/27

HPLunch   (details) 48 ENG   6KB
Fake menu for the Hewlett Packard cafeteria.
Author unknown. 1997/09/06

HPUP384k   (details) 48 ENG   124KB
Explains (with pictures) how to upgrade your 48G to 384K of RAM.
By Philippe Teuwen. 1997/08/21

I/O Guide   (details) 48 ENG   16KB
Gives HP 48 hardware information required to connect serial devices to the wired (serial) I/O port or to communicate with the HP 48 via the 2-way infrared (IR) I/O port. In a weird archaic Unix file format, so it isn't easily readable.
Author unknown. 2008/08/06

I/O Test   (details) 48 ENG   3KB
Explains how to test an HP to PC connection without bothering with Kermit.
By Ray Depew. 1997/08/21

IDClock 1.0   (details) 48 ENG   3KB/1KB
Source code (only) of an interrupt-driven digital clock with big numbers. Meant to be an example of how to make use of calculator system clock activation interrupt. It enables low power consumption between screen updates. Program is small, because it does not contain IRQ handlers itself and does not mess with system time counters.
By Robert Tiismus. 2002/12/28

Improved Matrix Accuracy   (details) 48 ENG   6KB
Shows how the matrix inversion accuracy of the 48GX is better than the 48SX.
By Joseph K. Horn. 2017/07/02

IN bug   (details) 48 ENG   1KB
Explanation of the bug with the IN instruction in the Saturn.
By Jan Brittenson. 2008/08/17

Increase IR Range   (details) 48 ENG   3KB
This document explains how to increase the range of the infrared port. Involves opening the calculator and replacing a resistor.
Author unknown. 1997/08/21

Index to Jim D's Book   (details) 48 ENG   7KB
Page index of supported System RPL entries in "An Introduction to HP 48 System RPL and Assembly Language Programming" by Jim Donnelly.
By Joseph K. Horn. 2008/08/15

Inf and NaN   (details) 48 ENG   4KB
Talks about the entry points for Inf and Nan.
By James Unterburger. 2008/08/17

Info on UBASE Bug   (details) 48 ENG   4KB
Information on a bug in the UBASE command.
By John H Meyers. 1998/10/17

INPUT Function Info   (details) 48 ENG   2KB
Some general information about how to use the User RPL INPUT command.
By Steve VanDevender. 1998/04/06

Inside the HP48   (details) 48 ENG   5KB
Tells about what it looks like inside the HP 48.
By David Holmes. 1997/08/21

Installing Libraries   (details) 48 ENG   7KB
Explains how to install libraries onto the HP 48. In Word format and from the FAQ.
Author unknown. 1997/08/21

Instructions for RPLCOMP   (details) 48 ENG   17KB
Documentation for HP's RPL compiler for MS-DOS.
By Hewlett-Packard. 1997/08/21

Intervalometer for Canon EOS 1.0   (details) 49/50 48 ESP   236KB
Explains the ways to make a serial link cable between the 48/49G and a Canon EOS camera. Turns the calculator into an intervalometer.
By Abraham Acevedo Garcia. 2008/05/11

Introduction to Saturn Assembly Language (HTML) Second Edition   (details) 48 ENG   108KB
Comprehensive introduction to Saturn assembly language. This isn't complete yet, so some sections are missing, but it is already 141 pages long. In HTML format; not recommended because of its size.
By Gilbert Fernandes and Eric Rechlin. 1999/08/10

Introduction to Saturn Assembly Language (PDF) Third Edition   (details) 49/50 48 ENG   822KB
Comprehensive 189-page introduction to Saturn assembly language. In Adobe Acrobat PDF format; this is the recommended format.
By Gilbert Fernandes and Eric Rechlin. 2005/07/16

Introduction to Saturn Assembly Language (Text)   (details) 48 ENG   87KB
Comprehensive introduction to Saturn assembly language. In text-only format; this is Gilbert's first document, based on Usenet posts, and contains many mistakes.
By Gilbert Fernandes. 1999/01/29

Introduction to Saturn Assembly Language (Word) Third Edition   (details) 49/50 48 ENG   286KB
Comprehensive 189-page introduction to Saturn assembly language. In Microsoft Word 2000 format.
By Gilbert Fernandes and Eric Rechlin. 2005/07/16

Introduction to SysRPL - Queensland Surveyor 2.0   (details) 49/50 48 ENG   670KB
A series of articles published in the Queensland Surveyor to introduce surveyors and other related professionals to System RPL programming on the HP 48GX and HP 49.
By Timothy Ney and Roger Fraser. 2003/08/30

Introduction to System RPL and Assembly Language   (details) 48 ENG   1836KB
This is a newly typeset version of the second edition of Jim Donnelly's famous "An Introduction to HP 48 System RPL and Assembly Language Programming" book, a 267-page introduction to programming the HP 48 with System RPL and Saturn assembly language. Included with permission of the author. Completely remade from scratch due to the original electronic copy being lost. Also includes a copy of the original disk. Please direct any errata to me (Eric) so I can fix any mistakes I may have made. In PDF format for US Letter paper.
By James Donnelly. 2009/05/19

Introduction to System RPL and Assembly Language (A4 Paper)   (details) 48 ENG   1416KB
This is a newly typeset version of the second edition of Jim Donnelly's famous "An Introduction to HP 48 System RPL and Assembly Language Programming" book, a 244-page introduction to programming the HP 48 with System RPL and Saturn assembly language. Included with permission of the author. Completely remade from scratch due to the original electronic copy being lost. Please direct any errata to me (Eric) so I can fix any mistakes I may have made. In PDF format for A4-sized paper.
By James Donnelly. 2009/05/31

Introduction to the HP48 in Spanish   (details) 48 ESP   123KB
Explains the very basics of using an HP 48.
By rojecas@maxwell.univalle.edu.co. 1998/11/15

IR Boosting Infomation   (details) 48 ENG   2KB
Tells what resistor to replace to increase the IR range to 30' (about 10 meters) or more.
By Scott Marlowe. 1997/09/06

IR Boosting Information 2   (details) 48 ENG   3KB
More information about increasing the range of the infrared port.
By Ivan Blumenschein. 1997/09/06

IR Box 4.0   (details) 48 ENG   30KB
Explains how to make an infrared port booster box for the HP 48.
By Tom Wong. 1997/08/21

IR Dust   (details) 48 ENG   3KB
A possible usage of your HP 48 as a portable heater.
By Joseph K. Horn. 1999/01/06

IR Information   (details) 48 ENG   3KB
This document explains how the infrared port on the 48 works.
By Dave Arnett. 1997/08/21

IR Remote Codes   (details) 48 ENG   5KB
Gives technical details about the IR remote control codes use for Sony and RCA equipment (TV, VCR, receiver, etc), useful for making your own universal remote. These codes are already built in to Remote.
By Brian Plumb and Rick McTeague. 2017/08/13

IR to RS-232 Adapter   (details) 48 ENG   58KB
Schematics (in PostScript and ASCII) for an IR to RS-232 adapter.
By Tony Duell and Uwe Ziegenhagen and others. 1997/08/21

IR Transfers in Assembly Language   (details) 48 ENG   4KB
Explains how to transfer data by infrared in assembly language at 7500 bps.
By Jean-Yves Avenard. 1998/10/17

It All Adds Up   (details) 48 ENG   10KB
Article from Measure, HP's employee magazine, (July-August 1991, page 18) on Bill Wickes, the father of RPL.
By Jay Coleman. 1998/09/07

Iterative Functions and the HP48   (details) 48 ENG   22KB
A look at the remarkable effects that can happen when you repeatedly give a function its own output (the foundation of chaos/fractal theory), some sobering facts on calculator precision, and lots of demo programs.
By Bill Markwick. 1999/05/04

Iterative Functions II   (details) 48 ENG   50KB
Sequel to the above document, with information on chaos, order, and the complex plane, and Julia and Mandelbrot fractals.
By Bill Markwick. 1999/10/16

Jim Davidson   (details) 48 ENG   8KB
Article from 65 Notes (July/August 1977, V4 N6 P25) on calculators for recreation.
By Jim Davidson. 1998/08/18

Jornal do HP Club do Brasil 1   (details) 48 POR   104KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 1999/03/13

Jornal do HP Club do Brasil 10   (details) 49/50 48 POR   110KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2000/01/26

Jornal do HP Club do Brasil 11   (details) 49/50 48 POR   107KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2000/02/13

Jornal do HP Club do Brasil 12   (details) 49/50 48 POR   136KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2000/03/14

Jornal do HP Club do Brasil 13   (details) 49/50 48 POR   69KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2000/04/29

Jornal do HP Club do Brasil 14   (details) 49/50 48 POR   71KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2000/06/20

Jornal do HP Club do Brasil 15   (details) 49/50 48 POR   101KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2000/08/23

Jornal do HP Club do Brasil 16   (details) 49/50 48 POR   148KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2000/09/12

Jornal do HP Club do Brasil 17   (details) 49/50 48 POR   97KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2000/11/18

Jornal do HP Club do Brasil 18   (details) 49/50 48 POR   117KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2001/01/03

Jornal do HP Club do Brasil 19   (details) 49/50 48 POR   62KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2001/01/24

Jornal do HP Club do Brasil 2   (details) 48 POR   142KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 1999/04/22

Jornal do HP Club do Brasil 20   (details) 49/50 48 POR   133KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2001/02/12

Jornal do HP Club do Brasil 21   (details) 49/50 48 POR   95KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2001/03/18

Jornal do HP Club do Brasil 22   (details) 49/50 48 POR   68KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2001/05/18

Jornal do HP Club do Brasil 23   (details) 49/50 48 POR   64KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2001/07/16

Jornal do HP Club do Brasil 24   (details) 49/50 48 POR   124KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2001/10/27

Jornal do HP Club do Brasil 25   (details) 49/50 48 POR   57KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2002/02/16

Jornal do HP Club do Brasil 26   (details) 49/50 48 POR   175KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2003/05/06

Jornal do HP Club do Brasil 27   (details) 49/50 48 POR   198KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2003/05/12

Jornal do HP Club do Brasil 28   (details) 49/50 48 POR   381KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2003/07/01

Jornal do HP Club do Brasil 29   (details) 49/50 48 POR   299KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 2003/12/26

Jornal do HP Club do Brasil 3   (details) 48 POR   139KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 1999/05/13

Jornal do HP Club do Brasil 4   (details) 49/50 48 POR   398KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 1999/06/12

Jornal do HP Club do Brasil 5   (details) 49/50 48 POR   235KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 1999/07/13

Jornal do HP Club do Brasil 6   (details) 49/50 48 POR   129KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 1999/08/13

Jornal do HP Club do Brasil 7   (details) 49/50 48 POR   121KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 1999/09/14

Jornal do HP Club do Brasil 8   (details) 49/50 48 POR   334KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 1999/11/15

Jornal do HP Club do Brasil 9   (details) 49/50 48 POR   109KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski. 1999/12/14

Journey to the Center of the HP 48   (details) 48 ENG   32516KB
English translation (by Doug Cannon) of the famous French book "Voyage au Centre de la HP 48", one of the best known books about low level programming of the 48S/SX. 397 page PDF.
By Paul Courbis, Sébastien Lalande, and Doug Cannon. 2017/09/29

Jumper Information   (details) 48 ENG   2KB
Explains why there are jumpers on the HP 48G series to adjust the clock speed.
By Dave Arnett. 1997/09/06

JYLOG HPROM Files   (details) 48 FRA   62KB
Guide to the 48SX Revision E ROM, documenting many of the entry points. Also includes basic guides to System RPL programming and some assembly language examples.
By Laurent Jouanneau. 2017/07/22

Kangaroo 2   (details) 48 ENG   2KB
Humorous excerpt from the HP-75 Internal Design Specification. Included on Goodies Disk 2.
Author unknown. 1997/09/06

Kangaroo 3   (details) 48 ENG   1KB
Humorous excerpt from the HP-75 Internal Design Specification. Included on Goodies Disk 3.
Author unknown. 1997/09/06

Kangaroo 5   (details) 48 ENG   2KB
Humorous excerpt from the HP-75 Internal Design Specification. Included on Goodies Disk 5.
Author unknown. 1997/09/06

Kangaroo 7   (details) 48 ENG   1KB
Humorous excerpt from the HP-75 Internal Design Specification. Included on Goodies Disk 7.
Author unknown. 1997/09/06

Kangaroo 8   (details) 48 ENG   2KB
Humorous excerpt from the HP-75 Internal Design Specification. Included on Goodies Disk 8.
Author unknown. 1997/09/06

Kangaroo 9   (details) 48 ENG   3KB
Humorous excerpt from the HP-75 Internal Design Specification. Included on Goodies Disk 9.
Author unknown. 1997/09/06

Key Locator Chart   (details) 48 ENG   18KB
Lists the keystrokes necessary for every function in the 48G series.
By Jake Schwartz. 2017/08/05

Key Table   (details) 48 ENG   4KB
Lists the key assignments on the 48S series that are useless at certain times and thus ready to be reassigned.
By Simone Rapisarda. 2008/08/17

Keyboard Interface   (details) 48 ENG   4KB
Shows how to poll the keyboard in assembly language, using AG mnemonics.
By Jan Brittenson. 2017/08/13

LASTARG   (details) 48 ENG   2KB
Explains how to use LASTARG to recover from stupid keyboard mistakes involving PURGE, STO, and shift-STO.
By Joseph K. Horn. 2008/08/17

LIBEVAL   (details) 48 ENG   4KB
Talks about the LIBEVAL command that was introduced in the G series.
By Joseph K. Horn. 2008/08/17

LIBEVAL list   (details) 48 ENG   3KB
Listing of LIBEVALs from the G series.
By Joseph K. Horn. 1998/01/03

Library File Format   (details) 48 ENG   5KB
Some information about the file structure of libraries.
Author unknown. 1998/03/06

Library History   (details) 48 ENG   9KB
A bit about the history behind libraries.
By Charles Patton. 2008/08/17

Library ID Numbers   (details) 48 ENG   16KB
Listing of many of the currently used library ID numbers.
By Joseph K. Horn and Balazs Fischer and others. 1998/06/08

Library IDs for HP 48   (details) 48 ENG   51KB
Listing of the numbers of library ID's of all easily-identifiable libraries for the HP 48 that are contained on this web site. Automatically updated every Sunday (despite the date in this listing).
By Carsten Dominik. 2001/03/09

Library IDs on Goodies Disks   (details) 48 ENG   16KB
Listing of the library ID numbers in use on the Goodies Disks and various ROM cards.
By Joseph K. Horn. 2008/08/17

Library Numbers   (details) 48 ENG   2KB
Lists the original rules for assignment of library numbers.
By Hewlett-Packard. 2008/08/17

Life is Short and ROM is Full   (details) 48 ENG   2KB
The original source of the "life is short and ROM is full" quote.
By William C Wickes. 2008/08/17

Link Tables   (details) 48 ENG   2KB
Explains how link tables work for locating XLIB numbers.
By Derek S. Nickel. 2017/08/13

Links to Manuals 1.1   (details) 49/50 48 ENG ESP POR   1KB
Contains a text file that gives the addresses on HP's site from which one can download PDF versions of HP 48 and HP 49 instruction manuals in various languages.
By Julián Kaihara. 2002/11/17

Long Ago   (details) 48 ENG   1KB
A couple predictions about calculators from "The Hewlett-Packard Personal Calculator Digest, Volume two, 1977".
By Hewlett-Packard. 2008/08/17

Long Answers to Short Questions About Entry Points   (details) 48 ENG   5KB
Discussion about entry points and their relation to SYSEVALs.
By Joseph K. Horn. 2008/08/13

MACHIN48   (details) 48 ENG   118KB
Miscellaneous programming documents written for the HP 48S series, covering primarily Machine Language and System RPL.
Author unknown. 1997/08/21

Machine Language Infomation   (details) 48 ENG   8KB
Contains information about programming in ML.
Author unknown. 1997/08/31

Machine Language Tips   (details) 48 ENG   10KB
Some tips for programming the HP 48 in machine language (assembly language).
By Steve VanDevender. 1997/08/21

MAKEROM Bugs   (details) 48 ENG   4KB
Some information about some bugs in MAKEROM from HP Tools.
By Mika Heiskanen. 2008/08/17

MAKEROM Docs in Spanish   (details) 48 ESP   8KB
Documentation for MAKEROM from Goodies Disk 4. Has a lot of useful information on creating libraries that's applicable for other library creators, too.
By Hewlett-Packard. 1998/05/02

Making a PC to HP Link Cable   (details) 48 ENG   8KB
Easy to follow directions for making a PC to HP link cable.
By Vimal Bhalodia. 1998/05/04

Making Custom Messages   (details) 48 ENG   7KB
Gives detailed information on how to create custom messages, like the Bart Simpson library.
By Rick Grevelle. 1998/03/15

Marketing Plan for HP's High End Calculator Line   (details) 48 ENG   316KB
A 66-page user community analysis suggesting a possible marketing plan for HP. In Adobe PDF format.
By Richard Nelson and others. 2000/04/29

Memory Card Info   (details) 48 ENG   11KB
This document explains how the memory cards for the HP 48 series work.
By Darryl Okahata. 1997/08/21

Memory Management   (details) 48 ENG   6KB
Lots of information about memory management useful to assembly language programmers.
By Gilbert Fernandes. 1998/12/10

Memory Reservation   (details) 48 FRA   5KB
Explains how to reserve memory and do memory management in assembly language.
By Jean-Yves Avenard. 1998/12/09

Memory Scanner   (details) 48 DEU   10KB
Information on the S-series memory scanner.
By Peter Farwig. 1998/01/12

Middle Battery   (details) 48 ENG   2KB
Explains why the middle battery drains faster.
By Dave Arnett. 1999/01/06

ML This Week   (details) 48 ENG   3KB
A set of 10 examples of programming in machine language, released weekly in 1997.
Author unknown. 2017/08/05

MODE Menu   (details) 48 ENG   5KB
Explains how to add menu items like those found in the MODE menu.
By Simone Rapisarda. 2008/08/17

Modifying Epson RAM cards   (details) 48 ENG   8KB
Explains how to modify Epson RAM cards for use in the HP 48.
By Allan Petersen. 1998/02/28

Mother Goose   (details) 48 ENG   2KB
Selections from "The Cybernetic Mother Goose"
By Lincoln Spector. 2008/08/16

Mystery Mini Challenge   (details) 48 ENG   1KB
This bizarre-looking User RPL program takes any real integer and returns the number of bits required to express it in binary. Mini-Challenge: figure out why it works.
By Joseph K. Horn. 2008/08/12

NASA   (details) 48 ENG   4KB
Tells about the HP 48's use on one of the first shuttle missions and the HP 28's use on later Apollo missions.
By Dave Arnett. 1997/09/06

Newton's Method   (details) 49/50 48 ENG   5KB
This pdf file goes over Newton's Method in lengthy detail. It provides how to program and use your calculator for Newton's Method.
By Aaron Toponce. 2002/11/14

Not a Bug   (details) 48 ENG   2KB
Explains that it's not a bug that the result is imprecise when trying to raise 125 to the 1/3 power.
By Joseph K. Horn. 2008/08/17

Not a Bug 2   (details) 48 ENG   2KB
Explains that it's not a bug, but rather a limitation, that you cannot use exponents on units higher than 127.
By Erik Naggum. 2008/08/17

Notes on RPL   (details) 48 ENG   3KB
Gives some background behind what keywords in RPL refer to and how they translate into the underlying code.
By Rick Grevelle. 2017/07/01

Noyau   (details) 48 FRA   24KB
Explains how to make changes to the kernel of the 48GX, such as changing the error beep sound. Includes sample programs. In Word format.
By Cellophan. 2000/06/20

Null Names   (details) 48 ENG   9KB
Information about null-named variables and directories.
By Rick Grevelle. 2008/08/17

Null Programs   (details) 48 ENG   3KB
Explains how to execute a program while there is a command line.
By Simone Rapisarda. 2008/08/17

Number   (details) 48 ENG   3KB
Explain what a number (1-5) in the status area means.
Author unknown. 1997/09/12

Nyquist Plots   (details) 48 ENG   1KB
Explains how to do Nyquist plots using the parametric plotter.
By Erin S. Catto. 2008/08/17

Object Oriented Manifesto   (details) 48 ENG   26KB
Huge document (74 KB) explaining why the HP 48 is object oriented (and other things).
By Chrstphre Campbell (TinyWanda). 1998/06/17

Observation About Using CLEAR in Programs   (details) 48 ENG   1KB
Short note about using CLEAR in programs. Is CLEAR considered harmful?
By Joseph K. Horn and others. 2008/08/13

Old HP48 FAQs   (details) 48 ENG   27KB
Two older HP 48 FAQ lists from 1991 and 1992. It's here partly because it's interesting to see things from the early Internet times and partly because they contain some information not in the current FAQ.
Author unknown. 1998/01/11

On-D Tests   (details) 48 ENG   12KB
Excerpt from the FAQ listing the various On-D diagnostic tests.
Author unknown. 1997/12/11

On-key Combinations   (details) 48 ENG   4KB
Lists the various On-key combinations.
By Dave Arnett. 1997/12/11

One-Minute MarvelsGet It   (details) 48 ENG   127KB
One hundred simple programs and routines that each take only a minute to type in. Also includes tips for optimizing programs and has a programming challenge at the end. In Adobe PDF format.
By Richard Nelson and Wlodek Mier-Jedrzejowicz. 1999/09/02

Open HP   (details) 48 ENG   6KB
Explains how to open the 48G with minimal damage.
By Scott Marlowe. 2017/08/05

OpenHP48   (details) 48 ENG   2530KB
Pictures and text explaining how to open your 48G without damaging it, using only one tool.
By Pawel Golaszewski. 2001/06/03

Opening from Front   (details) 48 ENG   25KB
Shows how to open the HP 48 by drilling from the front without taking of the keyboard overlay.
By Jim Cook. 1998/07/24

OpenIt2.txt   (details) 48 ENG   6KB
This file shows a mail order source for 128k RAM chips. It also includes basic information about performing the upgrade.
By Brad Keef. 1997/08/21

Overclocking   (details) 48 ENG   85KB
How to easily overclock the HP 48. This may be a joke...
By Nacho Vilalta. 2002/02/16

Parentheses Bug/Feature   (details) 48 ENG   1KB
Explains a bug/feature involving parentheses and the equation writer in ROMs A-E of the S series.
By Chris Holsapple. 2008/08/17

PC Link Cable Mould Designs   (details) 49/50 48 ENG   21KB
Detailed mold design to manufacture a plug for an RS-232 cable for the PC to calculator serial interface.
By John de Ponte. 2001/05/26

PC-HP Cable Instructions   (details) 48 DEU   5KB
Explains how to make a PC-HP serial cable.
Author unknown. 1997/08/31

PDL Spec Sheet   (details) 48 ENG   832KB
Specifications sheet in PDF format for the Firmware Systems Portable DataLab.
By Firmware Systems. 1999/07/31

PDL Tips   (details) 48 ENG   4KB
Some tips for using PDL, old programming software.
By Ted Beers. 2008/08/17

PH or HP   (details) 48 ENG   5KB
Article from 65 Notes (January 1975, V2 N1 P3) on why it's Hewlett-Packard rather than Packard-Hewlett.
By Richard Nelson. 1998/08/18

Plantillas creadas con debug4x   (details) 49/50 48 ESP   34KB
Explains how to create groups for data entry in Debug4x.
By Mauricio Arancibia Laguna. 2004/10/31

Pointers 1.0   (details) 48 ENG   1KB
The list of Saturn registers used in RPL.
Author unknown. 2008/08/19

Polling Keybuffer in ML   (details) 48 ENG   2KB
Explains how to poll the 48SX keyboard buffer in assembly language.
By Rick Grevelle. 1998/04/01

Port Path Bug   (details) 48 ENG   2KB
Identifies a bug in the GX where the RCL command does not work properly when given a high port (2 or higher) and a path to a variable.
By Joseph K. Horn. 2008/08/17

Potential 512k Chip Problem   (details) 48 ENG   2KB
Explains a mistake made in some documentation for adding a 512k chip.
By Blake T. Garretson. 1998/07/24

Power Consumption   (details) 48 ENG   7KB
Shows the power consumption of a 48G upgraded to 256 KB of RAM.
By Robert Tiismus. 1998/09/28

Program Development Link Comments   (details) 48 ENG   7KB
Review of the HP Program Development Link.
By James Dixson. 2017/08/13

Program Editing   (details) 48 ENG   2KB
Explains how can one include pre-written Code objects inside user-code programs without assembling the entire program.
By Joseph K. Horn. 2008/08/13

Programacion con ejemplos aplicados a Ing Civil 3.0   (details) 49/50 48 ESP   554KB
Information on programming in User RPL with examples applicable to civil engineering. Covers objects, types, PICT, the equation solver, and more.
By Andres Ricardo Garcia Morales. 2008/08/09

Programacion de interfases graficas en SysRPL 1.0   (details) 49/50 48 ESP   592KB/10KB
Complete manual of programming of graphic interfaces of the HP 48/49: use of events (message-handler), additional commands and examples with source code. It includes documentation with description of commands, header files and stack diagrams for use with Debug4x.
By Luis Angel Barahona Burgos. 2004/02/22

Programming in System RPL (PDF)   (details) 48 ENG   457KB
Excellent System RPL tutorial in Adobe PDF format. This is a real online book, totaling 249 pages. The second edition is available in the HP 49 section of this site.
By Eduardo M. Kalinowski. 2000/04/29

Programming in System RPL (Programs)   (details) 48 ENG   63KB
All program examples, with source code for Jazz and the PC as well as binaries, from the above book. The second edition is available in the HP 49 section of this site.
By Eduardo M. Kalinowski. 2000/04/29

Programming in System RPL (PS)   (details) 48 ENG   785KB
Excellent System RPL tutorial in PostScript format. This is a real online book, totaling 249 pages. The second edition is available in the HP 49 section of this site.
By Eduardo M. Kalinowski. 2000/04/29

Programming in User RPL in PDF 2.1   (details) 48 ENG   218KB
User RPL tutorial covering topics such as variables, tests, loops, and error handling. In Adobe PDF format.
By Eduardo M. Kalinowski. 2000/08/23

Programming in User RPL in PS 2.1   (details) 48 ENG   123KB
User RPL tutorial covering topics such as variables, tests, loops, and error handling. In PostScript format.
By Eduardo M. Kalinowski. 2000/08/23

Programming Questions in Spanish   (details) 48 ESP   12KB
Contains several programming questions, asked and answered in Spanish.
By Mario de Lama. 1998/02/19

Programming Tutorials   (details) 48 ENG   14KB
Tutorials for programming the HP 48 in User RPL. In HTML format.
By Richard Stanaway. 2000/03/18

Programs That Don't Run in High Ports   (details) 48 ENG   3KB
Explains why some programs don't run in ports higher than 1 and why the 48G is faster than the 48GX.
By David Maze. 1999/01/06

Purging Libraries with ID<100   (details) 48 ENG   2KB
Explains how to purge libraries that have ID numbers of less than 100.
By Joseph K. Horn. 1997/08/21

PUSH in ML   (details) 48 ENG   4KB
Explains how to properly use PUSH in assembly language.
By Mika Heiskanen. 2008/08/17

QUOTE and APPLY   (details) 48 ENG   2KB
Explanation of the QUOTE and APPLY functions.
By Charles Patton. 2017/07/01

Radio   (details) 48 ENG   2KB
Explains how HP was able to put so much into the HP 28.
By Eric Postpischil. 1997/09/06

RAM Expansion Guide   (details) 48 ENG   9KB
This document explains how to open and upgrade the RAM of the 48G.
Author unknown. 1997/08/21

RAM Upgrade Directions   (details) 48 ENG   942KB
The best RAM upgrade guide I have found. Has many pictures and HTML documents providing an easy to follow RAM upgrade guide.
By Stephane Grundschober. 1998/01/07

RAMGX   (details) 48 ENG   5KB/4KB
Seems to be an index of RAM addresses for the Voyager program, but the docs are in French so I can't be sure about that.
By CocoHP. 1998/01/20

RAND   (details) 48 ENG   3KB
Identifies the algorithm used by the random number generator.
By Detlef Müller and Steve VanDevender. 2008/08/17

Random Numbers   (details) 48 ENG   9KB
Lots of information on random numbers with the 48, including chances of getting a repeated number.
By Klaus Wolferts, John H Meyers, and Steve VanDevender. 1999/01/06

RC48-512 RAM Card   (details) 48 ENG   417KB
A design for a 512 KB RAM card for the 48GX, including a schematic and photos and all layout files.
By Paul Onions. 2017/06/11

Recovering Memory   (details) 48 ENG   3KB
Explains what happens when you choose "yes" at the Try To Recover Memory screen.
By Joseph K. Horn. 2008/08/17

Recursive Programming   (details) 48 ESP   10KB
Explains how to do recursive programming in User RPL.
By José M. Alarcón Aguin. 1998/04/13

REPLACE   (details) 48 ENG   2KB
All about the System RPL word 'REPLACE'.
By Joseph K. Horn and Steve VanDevender. 2008/08/17

Revision F   (details) 48 ENG   2KB
Explanation of why there are ROM revision letters and why there is no F despite evidence to the contrary.
By William C Wickes. 2008/08/17

Revista de la ETSIIG de Gijón, Febrero 2001   (details) 49/50 48 ESP   464KB
Newsletter of the users club of the ETSIIG of Gijón. Talks about the HP 48, HP 49, and GNU software.
By CdU ETSIIG. 2001/05/18

Revista de la ETSIIG de Gijón, Marzo 2001   (details) 49/50 48 ESP   464KB
Newsletter of the users club of the ETSIIG of Gijón. Talks about the HP 48, HP 49, and GNU software.
By CdU ETSIIG. 2001/05/18

Revista del CdU ETSIIG   (details) 48 ESP   966KB
Periodical publication that talks about the HP 48 and HP 49 and engineering software.
By CdU ETSIIG. 2001/04/04

ROM Version in S Series   (details) 48 ENG   2KB
Lists three ways to find the ROM revision in the 48S series.
By Joseph K. Horn. 2008/08/17

ROM Version Information   (details) 48 ENG   9KB
Excerpt from the FAQ listing the various ROM versions and their differences.
Author unknown. 1997/12/12

ROMPTAB   (details) 48 ENG   3KB
Explains the ROMPTAB System RPL entry point.
By Rick Grevelle. 2008/08/17

Roo-Man and Joey   (details) 48 ENG   1KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 1998/09/02

Roo-Man and Joey, #10   (details) 48 ENG   1KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 1998/09/09

Roo-Man and Joey, #11   (details) 48 ENG   2KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 2008/11/09

Roo-Man and Joey, #12   (details) 48 ENG   2KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 2008/11/09

Roo-Man and Joey, #2   (details) 48 ENG   2KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 1998/09/02

Roo-Man and Joey, #3   (details) 48 ENG   2KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 1998/09/02

Roo-Man and Joey, #4   (details) 48 ENG   1KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 1998/09/03

Roo-Man and Joey, #5   (details) 48 ENG   2KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 1998/09/04

Roo-Man and Joey, #6   (details) 48 ENG   2KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 1998/09/05

Roo-Man and Joey, #7   (details) 48 ENG   2KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 1998/09/06

Roo-Man and Joey, #8   (details) 48 ENG   3KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 1998/09/07

Roo-Man and Joey, #9   (details) 48 ENG   2KB
Humorous excerpt from the HP-75 Internal Design Specification.
Author unknown. 1998/09/08

RPL   (details) 48 ENG   1KB
Explains definitively what RPL stands for -- officially nothing, unofficially Reverse Polish Lisp.
By William C Wickes. 2008/08/17

RPL Commands new in GX   (details) 48 ENG   2KB
Lists the RPL commands new to the G series from the S series.
By CJ O'Neill. 1997/08/21

RPLComp Docs   (details) 48 ENG   6KB
Documentation for RPLComp, the RPL compiler from Goodies Disk 4.
By Hewlett-Packard. 1998/02/19

RPLComp Docs in Spanish   (details) 48 ESP   6KB
Documentation for RPLComp, the RPL compiler from Goodies Disk 4.
By Hewlett-Packard. 1998/02/19

RPLMAN Bug   (details) 48 ENG   1KB
Describes a bug in the RPLMAN.DOC document about the matchob? command.
By Jack Levy. 2008/08/17

RPLMAN en Español   (details) 48 ESP   983KB
RPL Programming Guide from Goodies Disk 4, translated into Spanish and converted to PDF format.
By Hewlett-Packard. 2012/09/15

RPLMan from Goodies Disk 4   (details) 48 ENG   65KB
RPL Programming Guide from Goodies Disk 4.
By Hewlett-Packard. 1997/08/21

RPLMan in PDF format   (details) 48 ENG   172KB
RPL Programming Guide from Goodies Disk 4 in Adobe Acrobat PDF format.
By Hewlett-Packard. 1998/01/15

RPLMan in Spanish   (details) 48 ESP   70KB
RPL Programming Guide from Goodies Disk 4.
By Hewlett-Packard. 1998/02/19

RS-232/IR Interface   (details) 48 ENG   58KB
Instructions explaining how to make an IR transceiver performing signaling format conversion between the Hewlett-Packard proprietary IR format used on the HP 48, and the standard RS-232 signaling used on any serial port. In PDF format.
By Berni Joss. 2000/07/16

Rules   (details) 48 ENG   3KB
Explanation of the names on the RULES 48G-series easter egg.
Author unknown. 1997/12/11

S/SX and G/GX Software Developing Tips   (details) 48 ENG   9KB
This document provides methods for writing assembly language software that will work on all ROM versions of the HP 48 (S, SX, G, or GX). Many of these methods may be used for System RPL programming as well, but the main focus of the document is for assembly language developers. Includes an example program, DOTS.
By Doug Cannon. 2008/08/15

S/SX and G/GX Software Developing Tips 2.0   (details) 48 ENG   28KB
Some tips for developing assembly language programs, including ways to ensure they work on multiple ROM versions (such as both the S series and G series). Includes sample source code.
By Doug Cannon. 2017/07/01

Safe Garbage Collection   (details) 48 ENG   11KB
Explains exactly how to do safe garbage collection in assembly language programs.
By Mika Heiskanen. 2008/08/16

SASM Docs   (details) 48 ENG   53KB
Information on assembly language programming of the HP 48 from Goodies Disk 4.
By Hewlett-Packard. 1998/01/15

SASM Docs in HTML   (details) 48 ENG   50KB
Information on assembly language programming of the HP 48 from Goodies Disk 4. In HTML format.
By Hewlett-Packard and Adrian Drury. 1998/06/24

SASM Docs in PDF Format   (details) 48 ENG   119KB
Information on assembly language programming of the HP 48 from Goodies Disk 4. In Adobe Acrobat PDF format.
By Hewlett-Packard and Warren Severin. 1998/01/15

SASM Docs in Spanish   (details) 48 ESP   56KB
Information on assembly language programming of the HP 48 from Goodies Disk 4, translated to Spanish.
By Hewlett-Packard. 1998/02/19

Saturn Architecture   (details) 48 ENG   8KB
Contains several documents with general information about the Saturn architecture.
Author unknown. 1998/02/17

Saturn Instruction Set   (details) 48 ENG   9KB
Comprehensively describes the Saturn instruction set.
By Derek S. Nickel. 2008/08/17

Saturn Processor Reference 1.0   (details) 48 ENG   26KB
Highly detailed reference of the Saturn processor architecture. Contains information about the chip registers/interrupt system/HP 48 peripheral interface and more! Distributed with permission.
By Matthew Mastracci. 1998/02/22

Scatter Plots with Lines   (details) 48 ENG   1KB
Explains how to make scatter plots with lines connecting the points.
By Jurjen N.E. Bos. 2008/08/17

Science and Engineering Mathematics with the HP49G   (details) 48 ENG   4KB
Book Review for "Science and Engineering Mathematics with the HP 49G", by Gilberto E. Urroz, PE, PhD.
By James Chapman. 2001/10/27

Scientific Comparison   (details) 48 ENG   264KB
Comparison of entry level scientific calculators. Compares the HP-30S with the TI-30XII and TI-34II. Designed to help one decide on a cheap, backup calculator to buy.
By Tim Wessman. 2001/10/27

Secret Reset Switch   (details) 48 ENG   3KB
All about the Secret Reset Switch hidden inside your HP 48.
By Joseph K. Horn and Ray Depew and others. 2008/08/17

Self-Modifying Programs In Library   (details) 48 ENG   1KB
Explains how to put a self-modifying programs into a library.
By Detlef Müller. 2008/08/17

Serial Cable Pinouts   (details) 48 ENG   3KB
Explains the pinouts for serial cables for connecting the HP to PCs, Macs, or Minitel machines.
By Johan Thornton and Preston Brown and others. 1997/09/21

Serial Connector   (details) 48 ENG   3KB
Information about making a connector to plug into the HP 48 serial port.
By Jeremy Smith. 1998/02/28

Serial Port Pinouts   (details) 48 ENG   3KB
Explanation of the serial port pinout on the HP 48.
Author unknown. 1997/08/21

Server Mode: The Whole Scoop   (details) 48 ENG   4KB
Thoroughly explains all the packets that are sent while in Kermit server mode.
By Joseph K. Horn. 2008/08/17

Seth's SysRPL Starter Doc   (details) 48 ENG   7KB
A primer for programming in System RPL.
By Seth Arnold. 1998/02/18

Short and Sweet Math Challenges for HP Fans   (details) 48 ENG   422KB
Collection of ten "math challenges"for programmers of HP calculators that were posted on the HP Museum discussion forum. Also includes solutions posted by various people. In Adobe PDF format.
Author unknown. 2005/09/03

Slave   (details) 48 ENG   2KB
The Psychology of Studly Nerds: explains why HP users buy an expensive calculator and connect it to their computers with a cheap home-made cable.
By Joseph K. Horn. 1997/09/06

SLoad Docs   (details) 48 ENG   4KB
Documentation for SLoad, the Saturn linker, from Goodies Disk 4.
By Hewlett-Packard. 1998/02/19

SLoad Docs in Spanish   (details) 48 ESP   5KB
Documentation for SLoad, the Saturn linker, from Goodies Disk 4.
By Hewlett-Packard. 1998/02/19

SmartROM Documentation   (details) 48 ENG   49KB
Documentation for the SmartROM ROM card previously available at EduCalc, in IBM printer and HP printer format.
By Smart Technology. 1998/04/19

SMI RAM Cards   (details) 48 ENG   3KB
Information about the RAM cards that SMI used to make for the HP 48.
By Joseph K. Horn. 1998/07/24

Smith Corona RAM Cards   (details) 48 ENG   2KB
One user's experience with Smith Corona RAM cards in the HP 48.
By Robin Getz. 1997/09/06

Softkey Index   (details) 48 ENG   11KB
Lists all of the 48GX's softkeys and shows what buttons to press to get to those softkeys.
Author unknown. 1998/01/23

Some HP 48 Internals Answers   (details) 48 ENG   14KB
Explains some of the fundamentals behind System RPL.
By Jan Brittenson. 2008/08/17

Some Notes about HP 48SX and 50g Calculators 1.0   (details) 49/50 48 ENG   254KB
Gives information about doing a few things on the calculators, including evaluation of polynomials, and corrections to the official manuals.
By Alberto Maria Marchetti. 2011/07/24

Some Unsupported Entry Points Explained   (details) 48 ENG   30KB
Some Unsupported Entry Points for the HP 48G series, with detailed explanation and examples. ASCII document.
By Jordi Hidalgo. 2000/09/13

Spanish HP 48 Tutorial   (details) 48 ESP   128KB
Spanish HP 48 tutorial to learn what the HP 48 can do in expert hands.
By Miguel Quintana Villalba. 2003/12/24

Speed up the HP 48?   (details) 48 ENG   1KB
Gives some basic information about the clock speed of the HP 48 and how it is set.
By Preston Brown. 1997/12/12

Spoof   (details) 48 ENG   4KB
This is the kind of stuff you're missing if you don't read comp.sys.hp48.
By Dave Arnett. 1999/01/06

START/STEP   (details) 48 ENG   2KB
Explains a real-world use of START/STEP, which might normally be thought of as superfluous.
By Klaus Kalb. 2008/08/17

Stat-related Bug   (details) 48 ENG   3KB
Describes a stat-related bug involving SigmaDAT in G series revisions K through P.
By Joseph K. Horn. 2008/08/17

Step-by-step Voyager Tutorial   (details) 48 ENG   5KB
Shows you how easy it is to tear apart an HP 48 library, completely figure out what it's for and how it was written, and even surgically remove routines from a library (manually! without TOOLS!), without having a scrap of documentation for the library itself. And then write an improved version that's shorter and faster!
By Joseph K. Horn. 2008/08/22

String to Real with a Brain   (details) 48 ENG   16KB
Mini Challenge to convert a string with a number and possibly other garbage into a real without making any errors, in User RPL. Also includes an assembly language solution.
Author unknown. 1998/10/15

Submenus in CST menu   (details) 48 ENG   3KB
Shows how to make "tabbed" items for submenus in the CST menu.
By Joseph K. Horn. 1997/08/21

Supported RAM Entry Access   (details) 48 ENG   8KB
Explains how to get the RAM address of some of the formerly supported 48S/SX RAM entry points in a way that will work for any version of the 48S/SX/G/GX. It assumes you already know how to properly and safely use the entries.
By Mika Heiskanen. 2008/08/17

SX RAM Upgrade   (details) 48 ENG   19KB
Explains how to upgrade the RAM in a 48SX.
By Stephane Grundschober. 1998/05/07

Symbolic Division   (details) 48 ENG   3KB
Explains how to do symbolic division.
By Joseph K. Horn. 2008/08/17

SYSEVAL Keys   (details) 48 ENG   3KB
Lists the SYSEVAL addresses corresponding to each of the key presses on the 48SX.
By Rick Grevelle. 2017/08/13

SysRPL Input Forms   (details) 48 ENG   4KB
How to make 48G input forms in System RPL.
By Sune Bredahl. 1997/08/21

SysRPL Programming Tutorial 1   (details) 48 ESP   5KB
A beginner's guide to starting programming in System RPL.
By Mario de Lama. 1998/04/13

SysRPL Programming Tutorial 2   (details) 48 ESP   11KB
A beginner's guide to compiling with Jazz.
By Mario de Lama. 1998/04/13

SysRPL Timings   (details) 48 ENG   4KB
Timings of various System RPL commands.
By Mika Heiskanen. 1998/02/22

System RPL Grobs   (details) 48 ENG   6KB
Explains how to include a GROB in System RPL and assembly language.
By Richard Steventon. 2008/08/17

System RPL Online Reference 1.01   (details) 48 ENG   53KB/57KB
ScreenshotLibrary for the HP 48 listing, and explaining, hundreds of System RPL commands. This is very comprehensive and very useful, if you can afford to give up the memory. Requires Eden and BZ.
By Robert H. Parry. 1999/03/08

TEMPOB   (details) 48 ENG   1KB
Explains how to view the TEMPOB area.
By Detlef Müller. 2008/08/17

The Canonical List of HP 48 Flag Usage   (details) 48 ENG   4KB
Table includes both User Flags and System Flags. Definitions already in the HP literature are not included here. Flags which the user need not worry about are not included here.
By Joseph K. Horn. 2008/08/13

The Difference Between CONTEXT and STOPSIGN   (details) 48 ENG   4KB
Explains the difference between CONTEXT and STOPSIGN in System RPL programming.
By Joseph K. Horn. 2008/08/17

The EduCALC   (details) 48 ENG   6KB
Article from 65 Notes (February/March 1976, V3 N2 P8) on the EduCALC teaching calculator.
Author unknown. 1998/08/18

The HP 48 Handbook   (details) 48 ENG   6KB
Review on James Donnelly's "The HP 48 Handbook."
By Eric Rechlin. 1998/08/23

The HP 48 Programmer's ToolKit Review   (details) 48 ENG   8KB
A thorough review of James Donnelly The HP 48 Programmer's ToolKit.
By Alonzo Gariepy. 2017/08/13

The Last of the HP49G   (details) 48 ENG   9KB
Theatrical comedy.
By Rafael Cobo. 2001/12/20

The Matrix   (details) 48 ENG   10KB
Kind of interesting for people who have used the Internet for a long time. Explains how to get HP 48 software and discusses email from back in 1991.
By Jeremy Smith. 1998/01/11

The Perfect Programmer   (details) 48 ENG   2KB
Poem from 65 Notes (January 1977, V4 N1 P1) on the "perfect programmer."
By Lou Ellen Davis. 1998/08/18

The Pitkin Tap   (details) 48 ENG   6KB
Article from the PPC Journal (January-March 1979, V6 N1 P26) on the made-up HP-86 and its "Pitkin Tap."
By John D. Hirsch. 1998/08/18

The Rosetta Stone   (details) 48 ENG   19KB
HP <-> AG Mnemonics.
By Joseph K. Horn, Jan Brittenson, and Dan Kirkland. 1997/10/18

TICKS Revealed   (details) 48 ENG   14KB
Explains how the built-in TICKS command works, including a disassembly of the source code.
By Joe Ervin. 2017/08/13

Token Ring Network   (details) 48 ENG   19KB
Explains how to network several HP 48s with a token ring network.
By Daniel Roggen. 1998/01/11

Token Ring Network (2)   (details) 48 FRA   3KB
Something about the above network setup, but I can't read it since it's in French.
By Daniel Roggen. 1997/09/06

Too Many 1-Bits   (details) 48 ENG   5KB
Humorous newsgroup post about how having too many 1-bits causes the batteries to drain more quickly.
By Steve VanDevender. 2008/08/12

Trace like HP 28   (details) 48 ENG   1KB
Shows how to replicate the TRACE functionality of the HP 28 on the HP 48.
Author unknown. 2008/08/17

Trigonometry Marathon 1.4   (details) 49/50 48 ENG   553KB
Detailed documentation of the capabilities of the HP 49G when working with trigonometric expressions. Orthographically corrected version with better layout.
By Nick Karagiaouroglou. 2003/07/16

Trivia on HP Handheld Calculators and PDAs   (details) 48 ENG   461KB
Lots of good information about virtually every HP handheld calculator or PDA. Contains 58 pages of excellent trivia. This is a pre-release version, so any errors should be reported to the author. In PDF format.
By Marc Staps. 2000/04/10

Turn Off Auto-Shutoff   (details) 48 ENG   2KB
Explains how to disable the 10-minute auto shutoff (doesn't look very easy, though).
By Dave Arnett. 1997/09/06

Tutorial de Integrais   (details) 48 POR   40KB
Explains how to do integrals on the 48G series. In Word 97 format.
By Carlos Marangon. 2017/07/26

Two Easy Ways to Speed Up Your HP 48 Keyboard   (details) 48 ENG   2KB
Tells how to speed up the keyboard on the 48: disabling user keys, and staying out of the library menu.
By Joseph K. Horn. 2008/08/17

UART Information   (details) 48 ENG   9KB
Basic information about the HP 48's UART.
By Jan Brittenson. 1998/03/09

Undocumented HP 48SX features   (details) 48 ENG   3KB
Lists some undocumented features in the 48SX, mostly related to I/O communications.
By Tony Duell. 2017/08/13

Unit Objects   (details) 48 ENG   3KB
General information about unit objects, including their structure and how to create them.
By James H. Cloos. 1998/03/15

Unit Reduction   (details) 48 ENG   4KB
HP Customer Support's explanation of how unit reduction works.
By Hewlett-Packard. 2008/08/17

Universal Lab Interface Software Developer's Guide   (details) 49/50 48 ENG   206KB
The Universal Lab Interface can be used with virtually any computer that has a serial communication port. This opens the door for use with the HP 48GX and 49G calculators, both of which have a serial port.
By Vernier Software. 2003/12/27

Upgrades   (details) 48 ENG   6KB
German document explaining how to upgrade the HP 48.
Author unknown. 1997/12/11

Urple   (details) 48 ENG   1KB
How do I say thee? A pronunciation mnemonic.
By Joseph K. Horn. 2008/08/17

USB48G - Upcycle Broken HP 48 Keyboard   (details) 48 ENG   1644KB
Shows how to "upcycle" a broken 48 to turn it into a USB keyboard.
By Michael P.. 2019/05/27

User Flags   (details) 48 ENG   2KB
Explains what user flags are used for.
By Greg Sanker. 2008/08/13

User Friendly Cartoons   (details) 48 ENG   182KB
Seven User Friendly cartoons from August 25 through September 1, 1999 referring to an old HP calculator. Redistributed with permission.
By Illiad of User Friendly. 1999/09/04

User RPL Online Reference for Eden/ED/TED/VV 1.1   (details) 48 ENG   53KB/57KB
ScreenshotThis is the above reference in two additional formats: one for Eden and one for ED/TED/VV. Requires Eden or ED/TED/VV and BZ.
By Robert H. Parry. 1999/03/04

User RPL Online Reference for Scribe   (details) 48 ENG   105KB/1-112KB
On-HP User RPL command reference based on Adrian Drury's HTML-based reference. Requires Scribe. Also includes a BZ-compressed version.
By Robert H. Parry. 1998/09/28

User RPL Tutorial in HTML 1.0   (details) 48 ENG   97KB
User RPL tutorial covering topics such as variables, tests, loops, and error handling. In HTML format.
By Eduardo M. Kalinowski. 1999/06/03

User RPL Tutorial in Portuguese 2.0   (details) 49/50 48 POR   1053KB
Comprehensive User RPL tutorial for programming the HP 49G and HP 48. Covers 128 commands in detail. In Microsoft Word format.
By Paulino de Jesus Pereira Lourenço. 2004/05/09

User RPL Tutorial in Spanish   (details) 48 ENG   38KB
Beginners guide to User RPL programming in Spanish. HTML format.
By Mario de Lama. 1998/02/19

User Tools   (details) 48 ENG   40KB
Explanation of the user tools part of the HP Journal article listed above in PostScript format.
Author unknown. 1998/08/23

Using a Modem   (details) 48 ENG   4KB
Explains how to connect and use a modem with a 48.
By Diego Berge. 1998/08/01

Using GOTO in UserRPL   (details) 48 ENG   7KB
Explains how to use the BASIC GOTO command when converting BASIC programs to RPL. Includes a maze-generation program as an example.
By Chrstphre Campbell (TinyWanda). 1998/01/22

Using HP 48 Backups With Emu48   (details) 48 ENG   2KB
Explains how to copy the data of a real HP 48 to Emu48 using the backup feature.
By Christoph Gießelink. 2002/01/22

Using Null Tags   (details) 48 ENG   1KB
Shows how to use null tags in a User RPL program to save memory.
By Gilles Martinoty. 1999/01/06

Using Smith Corona RAM Cards   (details) 48 ENG   12KB
Explains how to use Smith Corona RAM cards in the HP 48.
By Allan Petersen. 1997/09/06

Using Subroutines in System RPL   (details) 48 ENG   2KB
Explains how to use subroutines in System RPL internally, in one program.
By Matias Mutchinick. 1998/10/15

UsrLib Docs   (details) 48 ENG   8KB
Documentation for UsrLib, the library creator from Goodies Disk 4. Has a lot of useful information on creating libraries that's applicable for other library creators, too.
By Hewlett-Packard. 1998/02/19

UsrLib Docs in Spanish   (details) 48 ESP   9KB
Documentation for UsrLib, the library creator from Goodies Disk 4. Has a lot of useful information on creating libraries that's applicable for other library creators, too.
By Hewlett-Packard. 1998/02/19

USRLIB Listfiles   (details) 48 ENG   3KB
Most User RPL commands have System RPL commands that are identical but prefixed with an x, and these are used in listfiles generated by USRLIB.EXE. This cross-reference list shows all those that don't follow this pattern.
By Joseph K. Horn. 2017/07/30

USRLIB Tips   (details) 48 ENG   5KB
Frequently asked questions (and their answers) regarding USRLIB, for making libraries.
By Joel Nevison. 1997/12/11

Variation of CPU speed explained!   (details) 48 ENG   5KB
Another explanation of the speed variation of the HP 48.
By Matthew Mastracci. 1997/09/06

Vectored Enter   (details) 48 ENG   2KB
Explains the undocumented (in the 48SX) vectored enter functionality.
By William C Wickes. 2008/08/17

Vernier LabPro Technical Manual   (details) 49/50 48 ENG   346KB
This is the Technical Manual for the Vernier Software LabPro Interface for those adventurous HP programmers out there that might like to try to interface their HP calculators to this device.
By Vernier Software. 2003/12/27

Visio Cable HP 48   (details) 48 ESP   104KB
Graphically explains how to make a cable for the HP 48. In PDF format.
By Fidel Moreno. 2003/08/30

Voyage au Centre de la HP 48   (details) 48 FRA   6236KB
One of the best known books about low level programming of the 48S/SX, originally used by many of the great French programmers. 428 page PDF.
By Paul Courbis and Sébastien Lalande. 2017/09/29

Voyage au Centre de la HP 48G/GX   (details) 48 FRA   10247KB
48G/GX adaptation of one of the best known books about low level programming of the 48S/SX, originally used by many of the great French programmers. 610 page PDF.
By Paul Courbis and Sébastien Lalande. 2017/09/29

Wegwijs door ASM 0.2   (details) 48   287KB
This is an introduction to assembly translated to Dutch. Be aware though that there still is much to be done.
By Michaël De Coninck and Gilbert Fernandes. 2003/05/09

What Exactly Is RPL, Anyway?   (details) 48 ENG   9KB
Explains what exactly RPL is and what it isn't.
By Joseph K. Horn. 2008/08/17

What Kind of Programmer Are You?   (details) 48 ENG   8KB
Article from 65 Notes (September/October 1978, V5 N8 P31) giving a programming challenge and showing different solutions that people would give and what it tells about them.
By Bill Kolb. 1998/09/13

What's Up?   (details) 48 ENG   1KB
How to detect the presence of Bugs.
By Joseph K. Horn. 2008/08/17

WHILE-REPEAT-END Clause   (details) 48 ENG   2KB
Some information about the structure of the WHILE-REPEAT-END clause.
By Steve VanDevender. 2008/08/17

Why did you buy the HP 48?   (details) 48 ENG   7KB
Several users' reasons on why they bought the HP 48.
By Kevin Jessup and Ray Depew. 1997/12/12

Wire vs Infrared   (details) 48 ENG   3KB
Which takes more power, infrared or wire transfers?
By John Wettroth. 2008/08/17

XLIB Information   (details) 48 ENG   3KB
Some information about XLIBs and simple tools for working with them.
By Rick Grevelle. 1998/04/07

Yards, Feet, and Inches   (details) 48 ENG   4KB
Discusses the conversion of numbers involving yards, feet, and inches.
By Joseph K. Horn and Jan Brittenson. 2008/08/17

Part of the HP Calculator Archive,
Copyright 1997-2019 Eric Rechlin.