HP-41 Cataiog Enhancement Conflict OS/X vs HP-IL DEV+

[Ángel Martin]

Indeed I did a modified version of the IL-DEVL module back then with a few added HP-IL functions - the original module has a ton of empty space in it, specially in the upper page - The added functions are mostly from the Extended I/O ROM, but not all. I also patched the RREG function following Skwid's (a.k.a. Ken Emery) instructions, published in an old PPC article I'm afraid I lost the reference for... (old brain, bad eyes).

As per the I/O_SRVC polling point conflict - I didn't change that area at all (the IL-DEVL is a very tricky system module, so better not to mess with it). I never encountered that issue, but that's probably because I always use the OS/X in the lowest possibly page. Also I barely use the IL-DEV, so that combination os rare for me. The prompt lengthener is implemented in the OS/X, not in the IL-DVL - but that uses the CALC_ON event, not the I/O_SRVC of course.

I'd suggest reburning the NoVo putting the OSX in a lower port number and see how that fares, sorry I can't be of further assistance.

Cheers,
ÁM

PS. I've added the source code of my mods to this post in case that helps. I must say it's been quite a long time I looked into this code, so it looks quite incomprehensible right now ;-)