http://www.smspower.org/dev/docs/wik...are/BIOS#toc12
There's information about the Game Gear's BIOS, and from what I'm seeing, it seems to serve the same purpose as the MegaDrive's TMSS: lock out games that don't have a certain ASCII string in the ROM. It would also appear that Game Gears with a BIOS can select the correct palette data depending on whether a Game Gear or Master System cartridge is inserted.


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Death To MP3, 

