Probably not as many as you might assume. There's also the issue of the Game Boy running on an 8080 derivative, unlike the NES and Super NES, which ran on 6502

Probably not as many as you might assume. There's also the issue of the Game Boy running on an 8080 derivative, unlike the NES and Super NES, which ran on 6502 (and 65816) derivatives. You might be interested in these articles covering each console's architecture: * NES https://www.copetti.org/writings/consoles/nes/ https://www.copetti.org/writings/consoles/nes/ * SNES https://www.copetti.org/writings/consoles/super-nintendo/ https://www.copetti.org/writings/consoles/super-nintendo/ * Game Boy https://www.copetti.org/writings/consoles/game-boy/ https://www.copetti.org/writings/consoles/game-boy/