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Neison1
 Post subject: [28.1] 6502 Instruction
PostPosted: Mon Feb 28, 2000 4:10 am 
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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WizWom
 Post subject: [28.2] 6502 Instruction
PostPosted: Sun Mar 05, 2000 5:28 pm 
That should give you 0x99.


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