Undocumented Math instructions with the IY register
Undocumented math instructions for IY register
Opcode Matrix
| INC | DEC | ADD A | ADC A | SUB | SBC A | AND | XOR | OR | CP | |
|---|---|---|---|---|---|---|---|---|---|---|
| IYh |
INC IYh
FD24 |
DEC IYh
FD25 |
ADD A,IYh
FD84 |
ADC A,IYh
FD8C |
SUB IYh
FD94 |
SBC A,IYh
FD9C |
AND IYh
FDA4 |
XOR IYh
FDAC |
OR IYh
FDB4 |
CP IYh
FDBC |
| IYl |
INC IYl
FD2C |
DEC IYl
FD2D |
ADD A,IYl
FD85 |
ADC A,IYl
FD8D |
SUB IYl
FD95 |
SBC A,IYl
FD9D |
AND IYl
FDA5 |
XOR IYl
FDAD |
OR IYl
FDB5 |
CP IYl
FDBD |
|
Instruction
Opcode hex
| Undocumented |
Last modified November 16, 2021: Optimise undocumented pages (5f13800)