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There's already a region-free hack to the WonderMega and X'Eye BIOSes. I forget where they were posted... AssemblerGames or maybe SonicRetro... Anywho, if you want them, you can PM me. I know, I made most of them. :oops: Anyway I just copied Raq's idea ... lol 8) the problem with X'Eye and Wonderme...

On a talk I had with Tiido about the Wondermega2 BIOS, apparently the problem was something related to the Mega Drive side of it being different from the normal units. Your observation about the BRAM could be exactly what was causing the issue. It will likely help me too with hacking the Wondermega2...

Hi there ! As you know already, what the CDC do is collect data "frames" from the CD align it on a SRAM buffer, apply a layer of error correction (on top of the very basic one the CD drive does by itself already) then serve it to the host computer in "bursts" of parallel data... What you might not k...

I think you could test this by modifying a Genesis emulator to have a 512K save RAM cartridge with an ID of 0x05 instead of 0x04, and see if the BIOS allows that much data to be saved and loaded. I emulate 512KB cartridge RAM by default in Genesis Plus GX (but returns 0x06 as RAM ID, not 0x05) and ...

The only MEGA-CD rom which can't use 8192 blocks (512KB) backup ram cart is: SEGA MEGA DRIVE (C)SEGA 1991.NOV MEGA-CD BOOT ROM 12/17-1991 12:00 1.00p MEGA-CD BOOT ROM Basically the very first release of the BIOS(9111) for Japan. The 9112 1.00 version (I tested ASIA version which bears "PAL COMPATIBL...

I think that the first step towards making an *WORK RAM* expansion is search the MD side of the CD-BIOS and see if it has mechanisms to detect and determine if any extra connected memory is or isn't backup memory. From that information we can derive an circuit for such a cartridge. I believe that 1M...

Nice! The only problem I see is you labeled A1-15 as D1-15 in the sram diagram. Good point. 10 years later and I never noticed I did that typo... :( I wounder just an idea.What if you made a similar cartridge with sdram (for example) For example with this 64m chip http://www.jameco.com/webapp/wcs/s...

Hello ! I am the "friend" mentioned by TmEE. Back in 2000 or 2001 I contacted Steve Snake and he provided me with some information regarding how this works. I even remind vaguely trying to contact Charles MacDonald about this as well. So I rigged this up back in 2001 (or 2002): Memory map: https://l...