> To check D6 you can use either of these...
>
> lda CXP0FB
> bit #0
> bvs D6set
But the BIT instruction doesn't support immediate addressing.
(what a stupid thing to leave out!!!) So how does this work?
Oh. I see what you're doing. If my understanding of the BIT
instruction is correct, then it performs a logical AND of the
accumulator and the operand and sets the Z flag accordingly.
But it also copies bits 6 and 7 of the operand into the V and N
flags respectively. If this is correct, then simply changing
the addressing mode would achieve the intended effect:
bit CXP0FB ; moves bits 6 and 7 to the status register
bvs D6set ; checks bit 6 of CXP0FB
bmi D7set ; checks bit 7 of CXP0FB
-Chris
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