Re: That's new info! Message #9 Posted by Raymond Hellstern (Germany) on 27 Dec 2001, 10:01 a.m., in response to message #8 by Vieira, Luiz C. (Brazil)
Hi Luiz,
I don't know they have ever been produced as modules,
but they are 'normal' 4K ROM images.
Maybe the HP-41 service manual gives a hint.
I used the images many years ago in my MBK ProfiSet,
a 32K RAM box from W&W.
I loaded them into the first RAM bank, then switched the base address to 4xxxh.
After turning the calc off and on again the service ROM had total control of the system.
There were some tests, of which I only recall the keyboard test.
It was somewhat difficult to get rid of it again,
since it's a takeover ROM;-)
I had to deactivate the ON interrupt vector of the image
to be able to delete it...
Regards,
Raymond
BTW: Obviously there existed another maybe interesting module for the HP-41:
The Demo ROM. I only have the keyboard overlay of it.
Black background, upper frame and letters in red, with the word DEMO on the frame, lower frame and letters in green, with the word CHRONO on the frame.
Row labelling from top to bottom:
[DISP KEYS TIMER CHRONO ALARM]
[I/O CARD PRINT PLOT CASSETTE]
[SHIFT HPILPR CUSTOM BST]
[ RCLnnn SST/EXIT]
[SPLIT dSPLIT REG# CLEAR]
the remaining key labels are just the numbers and the R/S label.
I got this kbd overlay from an HP dealer in the early eighties, but unfortunately not the ROM;-)
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