hello

Hi, thank you for the kind appreciation.

My first goal was to finish the work for the 35.
It's done. I'm presently reviewing and cleaning the pages and drawing a global schematic with an electronic CAD software.

Regarding the programmable calculators, I worked hard last year with E. Smith to make the Java HP67 emulator running the rom image, with the card reader part.
It was a real hard work since we did not know exactly how the CRC (card reader circuit) was actually working. A bunch of micro code OP were unknown.

It's done : the java emulator is running the ROM dump.

HP 67 ROM emulator

I have done alone the same work for the HP25 - HP55 (both not yet publish-Eric does them in Nonpareil) and for the HP65 (for which I have a ROM image -object and source) and a robust Java emulator), since August 2007
For this last calc, a lot of OP were to guess. I was helped a lot by a friend in 2007 B.H. (he will recognize himself).

HP 65 ROM emulator


Let say it straight, I have not the courage to do, for the HP65 for example, the same thing I did for the 35.

I started this work in 2004 and I'm finished in 2009.

I only publish things on this web site when it adds value to the information already available. I'm very proud for example of two of my best sellers:
- the HP power unit page (took me two months of work),
- the HP35 ROM mapping (took me almost one year).

The best thing I can do for keeping trace of how a HP programmable calculator work, is to publish a commented ROM. I have the material and the knowledge.

Maybe I'll find the courage.

As you may have guessed, I'm now a retired engineer. So theoretically I got more time.
But there are so many other things to do in life . And time is slipping away …