1260 IF PEEK(20)<30 AND PEEK(19)=0 THEN 1330›1280 CHANGE=-CHANGE:POKE 1791,129-PEEK(1791):POKE 19,0:POKE 20,0:POKE 53255,127+77*CHANGE›5430 POKE 53278,0:POKE 19,0:POKE 20,0›