;Note: if you do X*0, where X is other than 0, it will glitch.
;multiplication 8-bit--------------------------------------------------------------

!scratch_ram = $00	;>scratch ram to use.
!input_value = $0DBF	;\can be ram addresses: "$xx" or specific values: "#$xx".
!multiply_by = #$05	;/>value should not be #$00
!output_value = $0DBF	;>should be only ram (unless you change this code)


	LDA !input_value	;\save value to memory.
	STA !scratch_ram	;/
	LDY !multiply_by-1	;>how many times to repeatly add. (if using long
				;address, use "LDA !multiply_by-1 : TAY" instead).
-	CLC : ADC !scratch_ram	;>use memory to repeatly add.
	DEY			;>"consume" number of times being added.
	BNE -			;>if number of repeats not 0, then loop.
	STA !output_value

;multiplication 16-bit-------------------------------------------------------------

!scratch_ram = $00	;>[2 bytes] scratch ram to use.
!input_value = $13E6	;>can be ram addresses: "$xx" or specific values: "#$xxxx",
!multiply_by = #$0005	;>should be only specific value greater than #$0000
!output_value = $13E6	;>should be only ram (unless you change this code)

	REP #$30
	LDA !input_value
	STA !scratch_ram
	LDY !multiply_by-1
-	CLC : ADC !scratch_ram
	DEY
	BNE -
	STA !output_value
	SEP #$30