Sega cd fusion bios american sega cd bios

Sega cd fusion bios american sega cd bios software#

The CD bios does not change the screen to red, whatever reason they chose to make it work that way is unknown to me. Sega CD+32X Recommended Bios set For use with Fusion Emulating Sega CD/Mega CD, 32X, Mega CD-32X and Sega CD-32X games For use with Gens Emulating Sega CD/Mega CD and 32X games Contains the Recomended bios versions:- 32XGBIOS. Sega Cd Bios Emuparadise and you can know this sega cd usa bios For use with Fusion Emulating Sega CD/Mega CD, 32X, Mega CD-32X and Sega CD-32X games. So no, relax and your EPROM is not rotting.Д®dit2: Actual game cartridges are programmed to change the screen to RED should the checksum routine fails. I know that, because my hacked ROMs have their checksum fixed, after patching and that value need fixing after I am done or else it will work only on emulators (Emulators do fix the rom checksum automagically, usually).

And if it's wrong, the console will crash with a black screen on BIOS boot. The official SEGA checksum routine doesn't check the first 200 bytes of the rom as well, by the way.ДЄt the data '31 2E 31 30 4D 7A 4A 20' the value '4D 7A' is the actual ROM checksum. Also it happens to contain the initial boot vector for the CPU to jump at after a hard reset and the initial address for the main stack pointer.Д«ut point made, except for the bits of the vectors that are actually used by the Mega Drive all the rest is not important at all.

Sega cd fusion bios american sega cd bios software#

The first 200 bytes of address space on the 68000 processor are something called 'vectors' and it means to tell the processor core which addresses are each of the system software routines that handle hardware events such exceptions, interruption requests and other events. The header area you have differences at is not even important to the normal operation of the BIOS. If the ROM works, (and by the look of it, the ROM does work) it's not bitrot but it was actually written that way. FFFF means that particular word wasn't written to.