參考資訊：
http://marc.rawer.de/Gameboy/Docs/GBCPUman.pdf
https://ia801906.us.archive.org/19/items/GameBoyProgManVer1.1/GameBoyProgManVer1.1.pdf
暫存器
| 8 Bits | 8 Bits |
|---|---|
| A | F |
| B | C |
| D | E |
| H | L |
| PC | |
| SP | |
AF、BC、DE、HL可以組成16Bit Register
旗標
| Bit 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|
| Zero(Z) | Subtract(N) | Half Carry(H) | Carry(C) |