Acorn Computers BBC Micro Model B w/8271 — Acorn BBC Micro Model B w/8271 User Guide Manual PDF

72 10 *FX 4,1 20 MODE4 30 X=500 40 Y=500 50 REPEAT 60 PLOT 69,X,Y 70 K=INKEY(0) 80 IF K=136 THEN X=X-4 90 IF K=137 THEN X=X+4 100 IF K=138 THEN Y=Y-4 110 IF K=139 THEN Y=Y+4 120 UNTIL Y=0 130 *FX 4,0