100 REM "A little stopwatch using the 16*2 shield"
200 REM "The setup()"
210 D=0: T=0: U=0: S=0: C=0
220 PUT &2,12: PRINT &2;"Time = ";
230 GOSUB 600
300 REM "The loop()"
320 GET &2,A
330 IF A=10 AND C=0 THEN C=A: GOTO 400
340 IF C=10 AND A=0 THEN C=0
350 IF A=49 THEN 500
360 DELAY 10
370 IF S=1 THEN T=MILLIS(10)-D
380 IF T<>U THEN U=T: GOSUB 600
390 GOTO 300
400 S=(S+1)%2:IF S=1 THEN D=MILLIS(10)
499 GOTO 300
500 END
600 REM "The display refresh"
610 @Y=0:@X=8:PRINT &2;"       ";
620 @Y=0:@X=8:PRINT &2;T;
630 RETURN