INT 4A - TI Professional PCIBM PC - KEYBOARD - GET KEYBOARD MODE
	AH = 02h
Return: AL = shift states (see #03213)
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h,INT 16/AH=02h


Bitfields for TI Professional PCIBM PC keyboard shift states:
Bit(s)	Description	(Table 03213)
 0	Ctrl key pressed
 1	Alt key pressed
 2	either Shift key pressed
 3-6	0
 7	CapsLock is ON