cseg at 0
jmp start

value equ 20h
mem equ 24h
z bit acc.0

x1 bit value.0
x2 bit value.1
y1 bit value.2
y2 bit value.3

start:
mov r6, #2
mov value, #0
portCounterLoop:
	clr a
	mov r7, #8
	mainLoop:
		rl a
		mov     c,x1
		cpl		c
     	orl     c,/x2
     	anl     c,y2
  		mov     mem.0,c
     	mov     c,x2
     	anl     c,/y1
	  	orl     c,mem.0
     	mov     z,c
		inc 	value
		djnz r7, mainLoop
	endMainLoop:

	cjne r6, #2, storeP1
	mov p0, a
	djnz r6, portCounterLoop

	storeP1:
	mov p1, a
end