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| [28] 6502 Instruction http://forum.6502.org/viewtopic.php?f=7&t=286 |
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| Author: | Neison1 [ Mon Feb 28, 2000 4:10 am ] |
| Post subject: | [28.1] 6502 Instruction |
Dear All: I met a problem with the operation mode of WDC65C02. In the ALU: if I add 1 and 2, the Acc will be 3. if I sub 1 and 2, the Acc will be 0xFF. But what would I get if sub 1 and 2 at the time I set the flag D (in BCD mode)? |
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| Author: | WizWom [ Sun Mar 05, 2000 5:28 pm ] |
| Post subject: | [28.2] 6502 Instruction |
That should give you 0x99. |
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