10 GRAPHICS 23›20 FOR X=0 TO 39›30 FOR I=0 TO 3›40 COLOR I›50 PLOT 4*X+I,O›60 DRAWTO 4*X+1,95›70 NEXT I›80 NEXT X›90 A=PEEK(712)›100 POKE 712,PEEK(710)›110 POKE 710,PEEK(709)›120 POKE 709,PEEK(708)›130 POKE 708,A›