I was going to spend some time cleaning and optimizing my code, when I
realized that I hadn't used the BIT instruction (I haven't a complete 6502
reference...)
I remember that it can be used to test bit 7 and 6 without touching the
accumulator content (this can be useful), and that it sets the zero flag
according to the result of the logical AND between the accumulator and the
memory.
This last thing is less clear to me, I mean are these things the same...:
LDA #mask
BIT memory
BEQ ... (BNE ...)
or
LDA memory
AND #mask
BEQ ... (BNE ...)
How should I choose between the two solutions?
Ciao,
P.
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