LASER DISCO – A type-in program for BBC Basic

10 MODE 5
20 VDU 23,1,0;0;0;0;
30 TIME=0
40 REPEAT
50 T=TIME
60 GCOL 0, RND(3)
70 DRAW RND(1278), RND(1021)
80 UNTIL T>10
90 TIME=0
100 CLS
110 GOTO 40