41C and modules from eBay — "NONEXISTENT"
Posted: Sun Apr 04, 2021 11:24 am
I just bought what appears to be a fully functional HP-41C, from eBay. (The seller said it "appeared to work," and it passed all rudimentary tests I could come up with.) I then bought the MATH I and STANDARD modules, each from a different vendor. (Both vendors promised that the modules "work perfectly.")
I can key in programs and run them fine (see them in CAT 1 etc.).
All catalog functions seem to work. However when I load programs from either module, I frequently get "NONEXISTENT" while running them.
For example, running the "WORDS" hangman game, from the STANDARD module. The program starts; prompts me for the word; I type in the six-letter word; I hit R/S...the little jet airplane flies across the display (that's how I think of it)...and then I get "NONEXISTENT."
I've tried moving the modules to different slots, but it makes no difference.
Can anyone point me in the right direction? I suspect (based on that last test — moving the modules around) that the problem's with the 41C hardware, but of course I don't have any idea. Is there a way to test the registers?
Thank you very much in advance for your time and attention, whoever can help!
Jordan
I can key in programs and run them fine (see them in CAT 1 etc.).
All catalog functions seem to work. However when I load programs from either module, I frequently get "NONEXISTENT" while running them.
For example, running the "WORDS" hangman game, from the STANDARD module. The program starts; prompts me for the word; I type in the six-letter word; I hit R/S...the little jet airplane flies across the display (that's how I think of it)...and then I get "NONEXISTENT."
I've tried moving the modules to different slots, but it makes no difference.
Can anyone point me in the right direction? I suspect (based on that last test — moving the modules around) that the problem's with the 41C hardware, but of course I don't have any idea. Is there a way to test the registers?
Thank you very much in advance for your time and attention, whoever can help!
Jordan