(IY+d)b <- 0
RES
b,(IY+d)
| b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0 | |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | $FD |
| 1 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | $CB |
| d | ||||||||
| 1 | 0 | b | 1 | 1 | 0 | |||
Bit b in the memory location addressed by the sum of the contents of the IY register pair and the two's complement integer d is set. In the assembled object code, operand b is specified as follows:
| Bit Tested | b | Hex |
|---|---|---|
| 0 | 000 | $86 |
| 1 | 001 | $8E |
| 2 | 010 | $96 |
| 3 | 011 | $9E |
| 4 | 100 | $A6 |
| 5 | 101 | $AE |
| 6 | 110 | $B6 |
| 7 | 111 | $BE |
None
If the index register contains $2000, then upon the execution of
RES 0,(IY+$3)
bit 0 in memory location 2003h is 1. Bit 0 in memory location $2003 is the least-significant bit.