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The Gameboy is not a Z80, it's a separate 8080-descendant sibling. The NES had zero modification to the 6502 core, except that the binary-coded decimal flag wa
by krallja 3y ago
The Gameboy is not a Z80, it's a separate 8080-descendant sibling.
The NES had zero modification to the 6502 core, except that the binary-coded decimal flag was hardcoded to always be off (to avoid infringing on the one patent that MOS filed; chip design was not copyrightable at the time).