5 FOR F=0 TO 15
10 FOR I=0 TO 39
20 POKE 1024+I,42:POKE 55296+I,F
30 POKE 1024+960+I,42:POKE 55296+960+I,F
40 NEXT I
50 FOR K=0 TO 960 STEP 40
60 POKE 1024+K,42:POKE 55296+K,F
70 POKE 1024+39+K,42:POKE 55296+39+K,F
80 NEXT K
90 NEXT F