20 X=15
30 Y=8
40 K=SW
60 IF K AND 8 THEN X=X+1
70 IF K AND 4 THEN X=X-1
80 IF K AND 2 THEN Y=Y+1
90 IF K AND 1 THEN Y=Y-1
100 IF X<0 THEN X=0
101 IF X>120 THEN X=120
102 IF Y<0 THEN Y=0
103 IF Y>31 THEN Y=31
110 CLS
120 LOCATE X,Y:PRINT "A"
140 GOTO 40
