Since there is no official source code available for Super Mario Bros, [Matthew] used a disassembled ... he wrapped the game’s ROM data into py65emu, a Python library emulating the 6502, the ...
ROM hacks like those the site hosted can be as minor as replacing the original Mario sprite with his Super Mario Bros. 3 ...
To someone who doesn’t yet know where the 1-up is in the first level of Super Mario Bros., the Game Genie seems ... into a 15-bit address in the game ROM (from 0x8000 to 0xFFFF for the 6502 ...