INT 16 - KEYBOARD - GET KEYBOARD FUNCTIONALITY                                  
	AH = 09h
Return: AL = supported keyboard functions (see #00585)
	AH destroyed by many BIOSes
Note:	this function is only available if bit 6 of the second feature byte
	  returned by INT 15/AH=C0h is set (see #00509)
SeeAlso: AH=03h,AH=0Ah,AH=10h,AH=11h,AH=12h,AH=20h,AH=21h,AH=22h,INT 15/AH=C0h


Bitfields for supported keyboard functions:
Bit(s)	Description	(Table 00585)
 7	reserved
 6	INT 16/AH=20h-22h supported (122-key keyboard support)
 5	INT 16/AH=10h-12h supported (enhanced keyboard support)
 4	INT 16/AH=0Ah supported
 3	INT 16/AX=0306h supported
 2	INT 16/AX=0305h supported
 1	INT 16/AX=0304h supported
 0	INT 16/AX=0300h supported
SeeAlso: #00511