yllawwally Posted March 12, 2013 Share Posted March 12, 2013 Does the 7800 bios do anything other than determine if a game is 7800 or 2600? Quote Link to comment Share on other sites More sharing options...
EricBall Posted March 13, 2013 Share Posted March 13, 2013 (edited) 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.com/7800/archives/bios7800.asm Edited March 13, 2013 by EricBall Quote Link to comment Share on other sites More sharing options...
DanBoris Posted March 17, 2013 Share Posted March 17, 2013 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. Quote Link to comment Share on other sites More sharing options...
Blue Azure Posted March 19, 2013 Share Posted March 19, 2013 Hello to Eric & Dan & Wallyworld, This is a full disassembly of the original 1984 release. I put the hex on it. 7800_NTSC_OLD_BIOS_DISASSY_E972.rtf Can someone plug this 1984 binary into a 1986+ machine and tell me if it works? It seems like it should. 7800BIOS_old_E972.bin THX, BLUE Quote Link to comment Share on other sites More sharing options...
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