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Int 15 Fn C3 - System - Enable/disable Watchdog Timeout (ps50+) [B]
AH = C3h
AL = function
00h disable PS/2 watchdog timer
01h enable PS/2 watchdog timer
BX = timer counter (0001h-00FFh)
02h disable Gearbox system
03h enable Gearbox system
Return: CF set on error
CF clear if successful
Note: the watchdog timer generates an NMI
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