SLL Shift left Logical and store in register
Undocumented Shift left logical and store in register
This instruction performs an SLL (IX+dd) or SLL (IX+dd) operation but then also stores
the result in a register as well as in the memory location.
Note: This is an undocumented extension to an undocumented instruction.
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
|---|---|---|---|---|---|---|---|---|
| SLL r,(IX+d) | ||||||||
| 1 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | DD |
| 1 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | CB |
| d | ||||||||
| 0 | 0 | 1 | 1 | 0 | r | |||
| SLL r,(IY+d) | ||||||||
| 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | FD |
| 1 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | CB |
| d | ||||||||
| 0 | 0 | 1 | 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) |
SLL A,(IX+d)
DDCBnn37 |
SLL B,(IX+d)
DDCBnn30 |
SLL C,(IX+d)
DDCBnn31 |
SLL D,(IX+d)
DDCBnn32 |
SLL E,(IX+d)
DDCBnn33 |
SLL H,(IX+d)
DDCBnn34 |
SLL L,(IX+d)
DDCBnn35 |
| (IY+d) |
SLL A,(IY+d)
FDCBnn37 |
SLL B,(IY+d)
FDCBnn30 |
SLL C,(IY+d)
FDCBnn31 |
SLL D,(IY+d)
FDCBnn32 |
SLL E,(IY+d)
FDCBnn33 |
SLL H,(IY+d)
FDCBnn34 |
SLL L,(IY+d)
FDCBnn35 |
|
Instruction
Opcode hex
| Undocumented |
Last modified November 16, 2021: Optimise undocumented pages (5f13800)