example simple assembler - counter

; Example for the following 8-bit machine simulator
; http://schweigi.github.io/assembler-simulator/index.html
; Enumerate numbers from zero to [C]

start:
	MOV C, 10    	; C = 10 
	MOV D, 232	; D = 232 ; D is set to output memory location
	CALL counter	; enumerate from 0 to C, output to *D
HLT		; Stop execution

counter:		; counter(C:max, D:*output)
	PUSH A	; int A
	PUSH B	; int B
	MOV B, 0	; B = 0
.loop:			; while
	MOV A, B	; A = B
	ADD A, '0'	; A = A + '0' ; ASCII printable
	MOV [D], A	; *D = A ; Write to output
	INC B		; B++
	INC D		; D++
	CMP B, C	; if (B != C)
	JNZ .loop	;  continue

	POP B		; forget B
	POP A		; forget A
	RET