[HP41] mcode question polling point entries

[Ángel Martin]

(03-28-2023 02:34 PM)MeindertKuipers Wrote:  In hindsight, we could have known this all. When writing HP41 mcode I usually have the HP41CX Programming Handbook open, and take a look at page 16 (in the attachment). So this info was very close to me all the time (.. sigh ..). It cleary says the logical keycode is in nybble 1 and 2 of N. Now maybe find a way to save just these two nybbles.

I agree Poul Kaarup's manual is an excellent reference for MCODE as well.
The use of N for the logical keycode was always clear, the question was whether this information was used. I was trying to find where exactly in the OS/X I/O poll code the N register was read, but did not succeed - but it's quite logical to assume there's some usage somewhere given the impact it has when modifying it.