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You may also find useful this other schematic, which I find easier to read, though some of the design details differ. It's from the NesDev wiki which is a fount of useful technical information about older Nintendo consoles. All of the chips you mention are low-level interface logic, and probably not important for your emulation. You'll need to do the same ...


The NES game Gimmick! uses self modifying code as part of its anti-piracy check failure response. 96 bytes are decrypted while being copied from ROM to RAM and then jumped to. This is to hide a routine that halts the game and displays the message BLACK HOLE when certain conditions are met.!

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