INT 15 - SYSTEM - POINTING DEVICE BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. INTERFACE (PSIBM PS/2, any model) - EXTENDED COMMANDS
	AX = C206h
	BH = subfunction
	    00h return device status
		Return: BL = pointing device status (see #00524)
			CL = resolution (see #00523)
			DL = sample rate, reports per second
	    01h set scaling at 1:1
	    02h set scaling at 2:1
Return: CF set on error
	    AH = status (see #00522)


Bitfields for pointing device status:
Bit(s)	Description	(Table 00524)
 0	right button pressed
 1	reserved
 2	left button pressed
 3	reserved
 4	0 if 1:1 scaling, 1 if 2:1 scaling
 5	device enabled
 6	0 if stream mode, 1 if remote mode
 7	reserved