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HP 35 hardware in depth analysis
01-26-2023, 04:39 PM (This post was last modified: 01-27-2023 04:05 PM by ThomasWendl.)
Post: #1
HP 35 hardware in depth analysis
Maybe this website might be helpfull for somebody?

https://archived.hpcalc.org/laporte/HW%20Exploration.htm

Regards
Thomas
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01-28-2023, 08:52 PM
Post: #2
RE: HP 35 hardware in depth analysis
Yes, it was very helpful for the work Tony and I did on the replacement board for the classic calculators.
I based the interface to the original display drivers on Jacques work. Very sad he isn't around to see them results anymore.
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01-28-2023, 09:46 PM
Post: #3
RE: HP 35 hardware in depth analysis
I worked closely with Jacques on reverse-engineering the instruction set of the HP-67/97 CRC (Card Reader Controller) chip. His work on documenting the algorithms of the HP-35 was excellent. From other sources we already knew on a rudimentary level how the HP-35 worked, but he uncovered and documented all of the details. I miss him very much.
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01-28-2023, 11:06 PM
Post: #4
RE: HP 35 hardware in depth analysis
Reading Jacques' notes inspired me to try and add a bit more in my Classic Notes file.

cheers

Tony
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01-31-2023, 01:14 PM
Post: #5
RE: HP 35 hardware in depth analysis
Jacques Laporte's website was an inspiration and an invaluable source of knowledge for my HP-35 reverse engineering presentation at Hackaday's Remoticon 2021. In fact, everyone who replied above me in this thread falls into that category.

Thanks everyone!

-Rob
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