X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 15 - system

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INT 15 - SYSTEM - ENABLE/DISABLE WATCHDOG TIMEOUT (PS50+)
        AH = C3h
        AL = 00h disable
             01h enable
                BX = timer counter
Return: CF set on error
        CF clear if successful
Note:   the watchdog timer generates an NMI

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