Has been repaired and archive has been replaced.Įdit2: File has been edited again and now contains patched BIOSes for all TRAY loading based models: US SEGA-CD, PAL MEGA-CD and JPN/Asia (Pal compatible) MEGA-CD. To achieve this I replaced the original SUB-CPU BIOS with RAQ's, changed the MEGA-CD MD side BIOS call at 0x0364 to point to a patched copy of the Japanese logo at 0圆F20 which executes and then returns execution to the game.Įdit: File failed on real hardware due to wrong SEGA checksum. His patch to the PAL ROM displays the SONIC logo on PAL or NTSC export discs and skips the logo if the disc is Japanese/domestic. The JP one contains his patched SUB-CPU BIOS and extra patches on the MEGA Drive side of the code to aways display the "PRODUCED BY OR UNDER LICENCE OF KABUSHIKI KAISHA SEGA ENTERPRISES" regardless of the inserted disc region. That and the XEYE BIOS were put up on Sonic Cult a while ago. This is a mirror of RAQ's original release: Emulating Sega Cd In Kega Fusion The Sega Cd is a peripheral which can be coupled Mega Drive, and therefore it could be a video-game Cd. 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 For use with Gens Emulating Never used this emu but this is the basic steps for setting up a bios for an emulator that needs one. Thanks to RAQ's work on the SUB-CPU bios I was able to put this MEGA/SEGA-CD BIOS package together with slightly extra bit of hacking: It's only been tested on an emulator (Kega Fusion) but i don't see why it wouldn't work on actual hardware. QuoteHere is a link to a modified Europen BIOS i did This 'hack' removes the country protection check and the CD security check, it's not perfect but it does work. Thanks to Russell OQuigley (RAQ) excellent work on reverse engineering the PAL MEGA-CD SUB-CPU BIOS this become possible:
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