IY <- IY - 1
DEC
IY
| b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0 | |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | $DD |
| 0 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | $2B |
The contents of Index Register IY are decremented.
None
If Index Register IY contains the integer $2271, then upon the execution of
DEC IY
Index Register IY contains $2270.