Miscelaneous Instructions
How to decode IO, EX and Interrupt instructions from binary
Only four rotate instructions are defined in the main opcode set, all the rest
require the CB prefix.
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|
| IO | |||||||
| 1 | 1 | 0 | 1 | D | 0 | 1 | 1 |
| EXX | |||||||
| 1 | 1 | 0 | 1 | 1 | 0 | 0 | 1 |
| EX | |||||||
| 1 | 1 | 1 | 0 | W | 0 | 1 | 1 |
| Interrupts | |||||||
| 1 | 1 | 1 | 1 | E | 0 | 1 | 1 |
| Instruction | D |
|---|---|
| Out | 0 |
| In | 1 |
| Instruction | W |
|---|---|
| DE_HL | 0 |
| (SP)_HL | 1 |
| Instruction | E |
|---|---|
| DI | 0 |
| EI | 1 |
Last modified November 12, 2021: Add Misc decoding (4c9e5b6)