INT 15 - Advanced Power Management v1.2 - ENABLE/DISABLE TIMER-BASED REQUESTS

	AX = 5313h
	BX = device ID (see #00474)
	    0000h (APM BIOS)
	    other reserved
	CL = function
	    00h disable timer-based requests
	    01h enable timer-based requests
	    02h get timer-based requests status
Return: CF clear if successful
	    CX = timer-based requests status (0000h disabled, 0001h enabled)
	CF set on error
	    AH = error code (03h,09h,0Ah,0Bh,86h) (see #00473)
Notes:	this function is supported via the INT 15, 16-bit protected mode, and
	  32-bit protected mode interfaces
	some BIOSes set AH on return even when successful
SeeAlso: AX=5300h,AX=5310h,AX=5311h,AX=5312h