Tiny Computer Moving Pixel

!@xPos        m32 !
!@yPos        m33 !
!@buttonTemp  m34 !
!@temp        m35 !

sub @xPos @xPos @xPos
sub @yPos @yPos @yPos
sub @buttonTemp @buttonTemp @buttonTemp

Loop:
	add 0 0 @temp
ClearScreenLoop:
	add 0 0 *@temp
	add @temp 1 @temp
	bne @temp 32 ClearScreenLoop

	add 0 b0 @buttonTemp
	and 128 @buttonTemp @buttonTemp
	bne 128 @buttonTemp SkipRight
	add @xPos 1 @xPos
SkipRight:

	add 0 b0 @buttonTemp
	and 32 @buttonTemp @buttonTemp
	bne 32 @buttonTemp SkipLeft
	sub @xPos 1 @xPos
SkipLeft:

	add 0 b0 @buttonTemp
	and 16 @buttonTemp @buttonTemp
	bne 16 @buttonTemp SkipUp
	sub @yPos 1 @yPos
SkipUp:

	add 0 b0 @buttonTemp
	and 64 @buttonTemp @buttonTemp
	bne 64 @buttonTemp SkipDown
	add @yPos 1 @yPos
SkipDown:

	bne @xPos -1 SkipResetXLow
	add 0 0 @xPos
SkipResetXLow:

	bne @yPos -1 SkipResetYLow
	add 0 0 @yPos
SkipResetYLow:

	bne @xPos 32 SkipResetXHigh
	add 0 31 @xPos
SkipResetXHigh:

	bne @yPos 32 SkipResetYHigh
	add 0 31 @yPos
SkipResetYHigh:

	ls 1 @xPos *@yPos

	vsync
	jmp Loop