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Results tagged with instruction-set
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user 16008
For questions regarding the instruction sets of microprocessors.
5
votes
1
answer
962
views
6502 - AND instruction updates flags differently than other logic operations
Why AND instruction updates flags in the fetch step?
Others logic instructions like ORA and EOR update flags in the same step that they update accumulator, in the decode step.
Is it a bug of visual6 …
- 389
19
votes
1
answer
4k
views
How did the 6502 ALU perform a decrement?
Assuming that this diagram is correct:
Instructions like INC, INX, and INY can easily perform increment using ALU sum with data on B input, 0 on A input and carry_in set.
But how do instructions like …
- 389