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renormalist/math.asm

Forked from hausdorff/math.asm
Created March 3, 2020 12:02
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mod and div implemented in 6502 asm
Raw
math.asm
; load some data up
LDA #$7
STA $00 ; memory addr A
LDA #$05
STA $01 ; memory addr B
JMP Divide
;modulus, returns in register A
Mod:
LDA $00 ; memory addr A
SEC
Modulus: SBC $01 ; memory addr B
BCS Modulus
ADC $01
;division, rounds up, returns in reg A
Division:
LDA $00
LDX #0
SEC
Divide: INX
SBC $01
BCS Divide
TXA ;get result into accumulator
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