RL Rotate bits left with Carry and store in register
Undocumented Rotate bits left with carry and store in register
This instruction performs an RL (IX+dd) or RL (IX+dd) operation but then also stores
the result in a register as well as in the memory location.
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
|---|---|---|---|---|---|---|---|---|
| RL r,(IX+d) | ||||||||
| 1 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | DD |
| 1 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | CB |
| d | ||||||||
| 0 | 0 | 0 | 1 | 0 | r | |||
| RL r,(IY+d) | ||||||||
| 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | FD |
| 1 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | CB |
| d | ||||||||
| 0 | 0 | 0 | 1 | 0 | r | |||
| Register | r |
|---|---|
| B | 000 |
| C | 001 |
| D | 010 |
| E | 011 |
| H | 100 |
| L | 101 |
| A | 111 |
Note: r=%110 does exist. It doesn't do a copy into a register as it's the existing official, documented instruction.
Opcode Matrix
| A | B | C | D | E | H | L | |
|---|---|---|---|---|---|---|---|
| (IX+d) |
RL A,(IX+d)
DDCBnn17 |
RL B,(IX+d)
DDCBnn10 |
RL C,(IX+d)
DDCBnn11 |
RL D,(IX+d)
DDCBnn12 |
RL E,(IX+d)
DDCBnn13 |
RL H,(IX+d)
DDCBnn14 |
RL L,(IX+d)
DDCBnn15 |
| (IY+d) |
RL A,(IY+d)
FDCBnn17 |
RL B,(IY+d)
FDCBnn10 |
RL C,(IY+d)
FDCBnn11 |
RL D,(IY+d)
FDCBnn12 |
RL E,(IY+d)
FDCBnn13 |
RL H,(IY+d)
FDCBnn14 |
RL L,(IY+d)
FDCBnn15 |
|
Instruction
Opcode hex
| Undocumented |
Last modified November 9, 2021: Add undocumented auto-copy RL (913d189)