Expects: AX    5309H
BX    ffffH
Returns: AH    APM error code (if CF=CY)
Info: This function resets the power management BIOS and reinitializes
all of its default settings.

You may access this service via INT 15H or by using the APM entry
address obtained via INT 15H 5302H or INT 15H 5303H (protected
mode connect).

See Also: APM API
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INT 15H 5309H: Restore System-BIOS Power-On Defaults