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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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4
Task/Twos-complement/6502-Assembly/twos-complement-1.6502 Normal file
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@ -0,0 +1,4 @@
LDA #%01010101
EOR #255
CLC
ADC #1 ;result: #%10101011

22
Task/Twos-complement/6502-Assembly/twos-complement-2.6502 Normal file
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myVar equ $20
LDA #3
STA myVar
LDA #0
STA myVar+1 ;equivalent C: uint16_t myVar = 3;
negate:
LDA myVar+1
EOR #255
STA myVar+1
LDA myVar
EOR #255
STA myVar
CLC
ADC #1
STA myVar
;this handles the case if we started with something where the low byte was zero.
LDA myVar+1
ADC #0
STA myVar+1