Post Reply 
Peculiarities in HP supplied S/SX and G/GX ROM dumps
03-26-2019, 10:38 PM
Post: #5
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!
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
RE: Peculiarities in HP supplied S/SX and G/GX ROM dumps - Giuseppe Donnini - 03-26-2019 10:38 PM



User(s) browsing this thread: 1 Guest(s)