INT 15 - Compaq SLT/286 - MODIFY POWER CONSERVATION/MODEM CONFIGURATION         
	AX = 4601h
	BL = system inactivity timeout (1-21 minutes)
	    FFh do not change
	CL = video display inactivity timeout (1-63 minutes)
	    FFh do not change
	DL = current fixed disk drive inactivity timeout (1-21 minutes)
	    FFh do not change
	DH = new modem state (00h turn off, 01h turn on, FFh don't change)
Return: CF clear if successful
	    AH = 00h
	    BL = current system inactivity timeout (1-21 minutes)
	    CL = current video display inactivity timeout (1-63 minutes)
	    DL = current fixed disk drive inactivity timeout (1-21 minutes)
	    DH = modem state (FFh unchanged, 00h turned off, 01h turned on)
	CF set on error
	    AH = error code
		01h input is out of range
		02h no modem present
SeeAlso: AX=4600h,INT 77