( my default test file )

:dev/r fff8 ( std read port )
:dev/w fff9 ( std write port )

|0100 @RESET 
	
	,02 ,dev/r STR ( set dev/read mouse#02 )
	,01 ,dev/w STR ( set dev/write screen#01 )

	,00 ,01 ,0001 ,0000 ,putpixel JSR
	,00 ,01 ,0000 ,0001 ,putpixel JSR
	,00 ,01 ,0002 ,0001 ,putpixel JSR
	,01 ,02 ,0001 ,0002 ,putpixel JSR

BRK

|c000 @FRAME

	( get mouse button, or break )
	,04 IOR
	,01 NEQ
	BRK?
		
	( paint a white pixel )
	,01 ,01 
	,getmouse JSR
	,putpixel JSR

BRK

@getmouse
	,02 IOR^ ( get mouse y )
	,00 IOR^ ( get mouse x )
	RTS

@putpixel 
	IOW^ ( y short )
	IOW^ ( x short )
	IOW ( color byte )
	IOW ( redraw byte )
	RTS

|d000 @ERROR BRK 
|FFFA .RESET .FRAME .ERROR