HP Forum Archive 07

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HP-41C: Reading ROM contents Message #1 Posted by Bernd Abel on 17 Dec 2001, 12:22 p.m. I own an HP-41C without any ZENROM, CCD-ROM etc. Just some application modules (Advantage, PPC ROM etc.) Is it possible to read the contents (simply the bytes) of a selected ROM (using software) with this minimal configuration? Any synthetic programs which could help me here? I know that in the last century (...well, in 1980/81) there were some folks from Australia working on reading the ROM contents, but I'm not sure whether this was the final solution to the problem. Cheers, --Bernd-- <http://www.berndabel.de>

Re: HP-41C: Reading ROM contents Message #2 Posted by Holger Veit on 18 Dec 2001, 3:52 a.m., in response to message #1 by Bernd Abel I don't know the answer to this concerning a "naked" HP41, but what about one with a CCD-ROM? This ROM contains a function to call an arbitrary procedure in ROM. So what's in principle is missing is some location in some public ROM which does a readrom (sp?) instruction (with IIRC the address in X); then everything else can be synthesized in user code. I doubt there is such a suitable code snippet anywhere in the System ROMs, but maybe in some other ROM, maybe even in the CCD-ROM itself. Does anyone know an address? Regards Holger

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