( controller )

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

;x 2 ;y 2 ;sprite 2

|0100 @RESET 

	#03 =dev/r ( set dev/read to controller ) 
	#02 =dev/w ( set dev/write to sprite ) 
	#0080 =x #0040 =y ( origin )

	#02 ,up_icn ~x ~y ,draw-sprite JSR

BRK

|c000 @FRAME 

	#03 =dev/r ( set dev/read to controller ) 

	,default_icn =sprite

	#00 IOR #10 NEQ ,next1 ROT JMP? POP2
		,up_icn =sprite
		~y #0001 SUB2 =y
	@next1
	#00 IOR #20 NEQ ,next2 ROT JMP? POP2
		,down_icn =sprite
		~y #0001 ADD2 =y
	@next2
	#00 IOR #40 NEQ ,next3 ROT JMP? POP2
		,left_icn =sprite
		~x #0001 SUB2 =x
	@next3
	#00 IOR #80 NEQ ,end ROT JMP? POP2
		,right_icn =sprite
		~x #0001 ADD2 =x
	@end
	( redraw )
	#03 ~sprite ~x ~y ,draw-sprite JSR

BRK

@default_icn [ 3c7e ffdb ffe7 7e3c ]
@up_icn      [ 2466 e7db ffff 7e3c ]
@down_icn    [ 3c7e ffff dbe7 6624 ]
@left_icn    [ 3c7e ef1f 1fef 7e3c ]
@right_icn   [ 3c7e f7f8 f8f7 7e3c ]

@draw-sprite
	IOW2 ( y byte )
	IOW2 ( x byte )
	IOW2 ( sprite address )
	IOW ( layer-color )
	RTS

|d000 @ERROR BRK 

|FFF0 [ 02ac 05bb 0b53 ] ( palette )
|FFFA .RESET .FRAME .ERROR