HP-71B Enhanced Math LEX

[Valentin Albillo]

.
Hi, Jean-François:

(01-09-2020 07:30 PM)J-F Garnier Wrote:  A few months ago I started my "Math ROM source file" project to document the Math ROM code and I reached a point where I can start to implement enhancements. The result is a preliminary version with these additions: [...]

Wow, what a very nice surprise !!

As you pretty well know, I'm truly very fond of the HP-71B Math ROM and its awesome instruction set. I've been having a look at your new page dedicated to it and really you've made my day, it's an awesome project, a dream come true !

In the past I've tried to find source code for the Math ROM, pulling a few strings here and there, HP included, but to no avail as the source code seems to have been lost or else is buried under forty keys and impossible to get to.

My main interest was the source code for matrix operations, including documentation on parse routines, element handling via direct access, etc. I figured that if I could *see* such code I would be able to create my own specialized MAT keywords, as there's been many times where I had to use slow user-code loops (FOR..NEXT and other looping constructs) which could be replaced by a MAT keyword doing it all at assembly-language speeds.

I need to read your page more extensively and intend to see if I can contribute to it in any way. Nevertheless, I've enjoyed it immensely and of course want you to succeed in achieving the goals you state. Perhaps a list of proposed additional functionalities could be created to focus the implementation priorities.

Thank you very much for starting this wonderful project.

Very best regards.
V.