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A helper project to dynamically generate the opcodes for each Game Boy CPU instruction mnemonic

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meganesu/generate-gb-opcodes

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Generate Game Boy CPU Opcodes

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This is a side project that came out of my attempt to make a Game Boy emulator. I was trying to make a table of opcodes for the Game Boy CPU (similar to the one on pastraiser), but doing it by hand was quite tedious. So this project dynamically creates a similar table!

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Code Key

  • r - 8-bit register (e.g. A)
  • rr - 16-bit register pair (e.g. HL)
  • d8 - 8-bit immediate data value
  • d16 - 16-bit immediate data value
  • a8 - 8-bit immediate value specifying an address in the range 0xFF00 - 0xFFFF
  • a16 - 16-bit immediate address value
  • s8 - 8-bit signed immediate data value

Note: Some conditional jump instructions take a different number of cycles depending on whether or not the specified condition is true (e.g., JP NZ, a16).

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A helper project to dynamically generate the opcodes for each Game Boy CPU instruction mnemonic

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