Message #1 Posted by Gerry Schultz on 2 Nov 2007, 4:23 p.m.
Before I pose my question, I want to mention that my copy of "A Guide to HP Handheld Calculators and Computers" by Wlodek Mier-Jedrzejowicz arived this morning and I haven't gotten a lick of work done since. I am really enjoying all the information it has about old HP calculators. It's a great read and a job well done. I first read about this book earlier this week here in the forum, so thanks.
Anyway, recently I spent way too much money and bought a bunch of HP-IL stuff to expand my 41C collection. It motivated me to go looking for a bunch of my old stuff buried away in boxes in my attic. To that end, I found my old HHP-16K 41C ROM Emulator made by Hand Held Products along with it's documentation. (As a side note, I also found my Port-X-tender, Model 4107 by AME Design along with all its documentation. Talk about memories!)
Now, the EPROMs that are in the ROM Emulator contain software called the JIMROM. I do have the documentation for the JIMROM that came with the Emulator but I would like to find more information as the documentation is pretty sketchy. There are routines mentioned like GTOROM, SXL, NSTO, NRCL, TP and VP. These routines look pretty simple but there is a long letter at the end of the documentation from John McGechie written on January 12, 1982 and goes into great detail about the JIMROM and I don't understand a lot of it.
If anyone has any more insight into this ROM, I would appreciate just being pointed in the right direction, and I'll go from there.
Thank you for your time.