Marcel Flipse

ID:1040
First Name:Marcel
Last Name:Flipse
Last Change:2019-10-25
Number of Files:10 (149th most prolific)
Number of Downloads:97,589 (91st most downloaded)

Do It Yourself RAM Card   (details) 48 ENG   989 KB
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

External Serial Buffer   (details) 49/50 ENG   413 KB
Fix for the buggy serial port buffer in early HP 49Gs without requiring opening the calculator. In Adobe PDF format.
By Marcel Flipse. 2000-02-09

HP 48 "X-Ray"   (details) 48   334 KB
A simulated X-ray image of the 48G-series circuit board with all components removed. Created to aid in the creation of the circuit schematic.
By Marcel Flipse. 2017-05-28

HP 48 Bottom   (details) 48   384 KB
Very high quality scan of the bottom of the 48G's motherboard with most components removed.
By Marcel Flipse. 1999-05-22

HP 48 Schematics 1.6   (details) 48 ENG   286 KB
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 Top   (details) 48   432 KB
Very high quality scan of the top of the 48G's motherboard with most components removed.
By Marcel Flipse. 1999-05-22

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

Infrared Adapter 1.2   (details) 49/50 ENG   2,901 KB
Information about an adapter to convert the serial port into an infrared port. I guess this is proof that HP was incorrect about needing an additional high-power pin to support IR.
By Marcel Flipse. 2001-06-24

Inside the HP 49G   (details) 49/50 ENG   581 KB
Huge high-quality photo of the circuit board in the HP 49G.
By Marcel Flipse. 1999-10-06

Serial Port Bug   (details) 49/50 ENG   280 KB
Explains a hardware bug in the serial port of the 49 and shows how to fix it.
By Marcel Flipse. 1999-12-31

Part of the HP Calculator Archive,
Copyright 1997-2025 Eric Rechlin.