Peculiarities in HP supplied S/SX and G/GX ROM dumps
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03-26-2019, 10:38 PM
Post: #5
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RE: Peculiarities in HP supplied S/SX and G/GX ROM dumps
(03-26-2019 06:27 PM)Jonathan Busby Wrote: It would seem that the authors of most of the 48 emulators have known about this problem and the emulators must patch the ROM dump, or something similar, or else, during the IROM self test, one would get an error. Correct! Emu48 uses a special byte-oriented format where each nibble is expanded to a full byte with the high-order nibble left zero (which is very convenient in C where half-bytes aren't natively supported). So, in order to work, every ROM dump must first be converted to EMU format and during the conversion, guess what? ... the region from #00100h - #0013Fh (now 64 bytes, not nibbles) is silently filled with zeros! |
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Messages In This Thread |
Peculiarities in HP supplied S/SX and G/GX ROM dumps - Jonathan Busby - 03-26-2019, 03:28 PM
RE: Peculiarities in HP supplied S/SX and G/GX ROM dumps - Jonathan Busby - 03-26-2019, 03:53 PM
RE: Peculiarities in HP supplied S/SX and G/GX ROM dumps - Giuseppe Donnini - 03-26-2019, 05:32 PM
RE: Peculiarities in HP supplied S/SX and G/GX ROM dumps - Jonathan Busby - 03-26-2019, 06:27 PM
RE: Peculiarities in HP supplied S/SX and G/GX ROM dumps - Giuseppe Donnini - 03-26-2019 10:38 PM
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