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Int 2F Fn 1223 U - DOS 3+ Internal - Check If Character Device [D]
AX = 1223h
DS = DOS DS
SS = DOS DS (must be using a DOS internal stack)
SDA+218h (DOS 3.10-3.30) = eight-character blank-padded name
SDA+22Bh (DOS 4.0-6.0) = eight-character blank-padded name
Return: CF set if no character device by that name found
CF clear if found
BH = low byte of device attribute word
Note: can only be called from within DOS
See Also: INT 21/AX=5D06h,INT 21/AX=5D0Bh
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