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kc5tja
PostPosted: Wed Jan 16, 2008 4:16 am 
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Joined: Sat Jan 04, 2003 10:03 pm
Posts: 1706
http://6502org.wikidot.com/software-incdec

The 16-bit decrement with test for zero appears to be buggy. Shouldn't that code read:

Code:
      LDA NUML
      BNE LABEL
      LDA NUMH
      BEQ ZERO ; branch when NUM = $0000 (NUM is not decremented in that case)
      DEC NUMH
LABEL DEC NUML

??
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dclxvi
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PostPosted: Wed Jan 16, 2008 5:41 am 
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Joined: Thu Mar 11, 2004 7:42 am
Posts: 362
Yes it should. Good eye. I've corrected it.
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