I needed to add two 16 bit integers to produce a 16-bit answer using absolute mode addressing. I, however, messed up the memory addresses and can't figure out why. Please advise me on correcting my code:
x1 = $0410
y2 = $0411
s1 = $0412
Start at $0500
CLC 18
LDA x1 AD 10 04
ADC y1 6D 11 04
STA s1 8D 12 04
LDA x1+1 AD 11 04
ADC y2+1 6D 12 04
STA s1+1 8D 13 04
BRK 00
As a 16-bit integer takes two bytes, your locations overlap. You need to space them two bytes apart:
x1 = $0410
y2 = $0412
s1 = $0414
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