>
> AND #%01111111 ; this should mask off the sign bit
> ; note that abs(-128) would be 0 using this method
Won't work for absolute values. $FD is -3, but $7D is 125 when masked.
How about:
TAX
LDA ABSVALUE,X
for a total of 6 cycles, at a cost of 256 bytes of ROM (less if the value
is known to be smaller than +/- 128).
Hey, if it's essential to the inner display loop, just do it.
> > ...and a better way to check when A is between two values (#amin <= A < #amax):
>
> Can't help here...
Neither can I. Two CMP's are the best solution.
- Jim
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