HP-41CY re-initialization ROM

[Jurgen Keller]

(11-04-2019 09:35 PM)Diego Diaz Wrote:  Hi Jurgen, all,

I would say that your "monologue" feeling comes mostly from the fact that there are very, very few CYs out there; and not because your M-coding efforts are not appreciated. They are! :-)

I don't have a CY myself, however, a well known contributor here sent me his CY for repair... IICR one memory chip and a logic IC were damaged (as weird as it may sound.)

Once the HW was fixed, reinstalling the W&W OS was not trivial. I made a heavily modified Clonix-D, running HEPAX at and odd page (preventing auto allocation) and use the CRF (Crash Recovery Function) stolen from the NoV-64 code, to prevent polling crashes.

A lot of fun (for a real geek :-) but certainly doing all that with a simple Clonix and M-code at page #4 is a serious programming achievement.

Congrats from Spain.

Diego.

Agreed, the 41CY community is probably quite small and there are many other interesting topics about HP calculators. Sometimes, talking to yourself or writing down your thoughts helps even if you don't get a reply. And in the end, there were some interesting inputs and encouraging words. Highly appreciated!

Your quote "Do not suppose, check it twice" perfectly applies to this project. I programmed the CLONIX module (love it) over and over again to check assumptions and verifying each step. And sometimes I was at that point:
Real coders ... love their machine

Now I started to write some documentation ... boring ;-)