Subtracts the source from the destination, and subtracts 1 extra if the Carry Flag is set.
Results are returned in “dest”.
Usage:
SBB Dest,Src
Modifies flags:
AF CF OF SF PF ZF
286+ only 386+ only
| Clocks | Size | |||||
|---|---|---|---|---|---|---|
| Operands | 808x | 286 | 386 | 486 | Bytes | |
| reg,reg | 3 | 2 | 2 | 1 | 2 | |
| mem,reg | 16+AE | 7 | 7 | 3 | 2-4 | (W88=24+EA) |
| reg,mem | 9+EA | 7 | 6 | 2 | 2-4 | (W88=13+EA) |
| reg,immed | 4 | 3 | 2 | 1 | 3-4 | |
| mem,immed | 17+EA | 3 | 2 | 1 | 3-6 | (W88=23+EA) |
| accum,immed | 4 | 3 | 2 | 1 | 3 | |