IBM CFC2 - Manual (Page 121)

113 Appx. A
The following example shows how you might program the watchdog
timer in BASIC:
10 REM Watchdog timer example program
20 OUT &H443, data REM Start and restart the
watchdog
30 GOSUB 1000 REM Your application task #1
40 OUT &H443, data REM Reset the timer
50 GOSUB 2000 REM Your application task #2
60 OUT &H443, data REM Reset the timer
70 X=INP (&H443) REM Disable the watchdog timer
80 END
1000 REM Subroutine #1, your application task
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1070 RETURN
2000 REM Subroutine #2, your application task
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2090 RETURN