mod and div implemented in 6502 asm

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