At 07:10 PM 1/28/2004, you wrote:
clc
lda fracvel
bmi .negvel
adc fracpos
sta fracpos
lda intpos
adc #0
; check for overflow & jump to staint
.negvel
adc fracpos
sta fracpos
lda intpos
adc #-1
; check for underflow & jump to .staint
.staint
sta intpos
I'm having a little hard time figuring out how "signed" math works as in
this example.
If the number is negative, why do you do an adc instruction instead of a
sbc instruction?
Is this example complete or is there something missing?
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