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What does the 7800 bios do?


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IIRC it also does some sanity checks on the 6502 & other hardware along with the fuji graphic while it verifies the digital signature. There's even a disassembly with some comments: http://www.atariage....es/bios7800.asm


Yep, this is all it does. Once the verification is complete the bios is swapped out for the cartridge ROM so isn't even used after the game starts. So technically it's more of a boot loader then an actual bios.

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