hpcalc.org - HP 48 Archive

Instructions on Opening the HP 48

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

There are 31 files totaling 13277KB in this category.

AddHard 48   (details) 48   EN   1239KB
This .zip file contains a lot of information in the form of text files and pictures about opening and modifying the HP48. 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

Apart 48   (details) 48   EN   11KB
Describes an alternative (less destructive) method of taking apart the HP48.
By David Fenyes. 1997/08/21

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

DomeHP01.jpg   (details) 48   EN   86KB
Complete image of the ORIGINAL internal top part of the opened HP48G.
By Andrea Domenichini. 1997/08/21

DomeHP02.jpg   (details) 48   EN   60KB
Complete image of the ORIGINAL internal bottom part of the opened HP48G.
By Andrea Domenichini. 1997/08/21

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

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

DomeHP05.jpg   (details) 48   EN   81KB
Complete image of the UPGRADED internal top part of the opened HP48G.
By Andrea Domenichini. 1997/08/21

DomeHP06.jpg   (details) 48   EN   62KB
Complete image of the UPGRADED internal bottom part of the opened HP48G.
By Andrea Domenichini. 1997/08/21

DomeHP07.jpg   (details) 48   EN   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

Expanding RAM in the G   (details) 48   EN   11KB
Yet another 48G opening/RAM expansion guide.
Author unknown. 1997/08/21

How to open your HP48   (details) 48   EN   10KB
This has basic information about opening the HP48G/S.
By Paul Smith. 1997/08/21

How2Open   (details) 48   EN   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 HP48 by making cuts from the back, severing rivets inside the case.
By Adrian Drury. 1997/08/21

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

HP Inside 1   (details) 48   EN   79KB
Disassembled HP48, whole view.
By KENDY. 1997/08/21

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

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

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

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

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

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

HP48G128   (details) 48   EN   189KB
HP48G Platine in Draufsicht, mit 128 K RAM (SMD-Ram getauscht). Also fast normal.
Author unknown. 1997/08/21

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

HPAUSB_1   (details) 48   DE   115KB
HP48G Platine in Seitenansicht auf 384K aufgeruestet, also zwei Huckepack DIL's auf der Platine.
Author unknown. 1997/08/21

HPAUSB_2   (details) 48   EN   214KB
HP48G Platine in Draufsicht auf 384K aufgeruestet mit den zwei Huckepack DIL's auf der Platine.
Author unknown. 1997/08/21

OpenHP48   (details) 48   EN   2530KB
Pictures and text explaining how to open your HP48G without damaging it, using only one tool.
By Pawel Golaszewski. 2001/06/03

Opening from Front   (details) 48   EN   25KB
Shows how to open the HP48 by drilling from the front without taking of the keyboard overlay.
By Jim Cook. 1998/07/24

OpenIt2.txt   (details) 48   EN   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

RAM Expansion Guide   (details) 48   EN   9KB
This document explains how to open and upgrade the RAM of the HP48G.
Author unknown. 1997/08/21

RAM Upgrade Directions   (details) 48   EN   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 (H). 1998/01/08

Part of the HP Calculator Archive,
Copyright 1997-2008 Eric Rechlin.