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Int 15h, C3h Enable/disable Watchdog Time-Out PS/2
Entry AH = C3h
AL = 00h Disable watchdog time-out
01h Enable watchdog time-out
BX = Watchdog timer count (1-255)
Return For PCjr and PC:
AH = 80h, CF = 1
For PC XT, AT, XT 286, Convertible, PS/2 30:
AH = 86h, CF = 1
For All Others:
CF = 0 Operation successful
= 1 Operation unsuccessful
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The watchdog time-out is specifically inteded for use in operating
system software, and is rarely of use in application programs.
However, you can enable or disable the watchdog time-out with this
service.