INT 16 - DOS/V - DOUBLE-BYTE CHARACTER SET SHIFT CONTROL                        
	AH = 13h
	AL = function
	    00h set shift status
		DX = shift status (see #00589), must preserve internal status
			  bits
	    01h get shift status
		Return: DX = current shift status (see #00589)
Note:	these functions are supplied by the Japanese Front-End Processor
SeeAlso: AH=14h,INT 21/AX=6301h


Bitfields for DOS/V shift status:
Bit(s)	Description	(Table 00589)
 0	full-size rather than half-size
 2-1	character input mode
	00 alphanumeric, 01 Katakana, 10 Hiragana, 11 unused
 5-3	internal status
 6	Romaji enabled
 7	Katakana to Kanji conversion enabled
 15-8	internal status