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INT 2F - Multiplex - DOS 3+ internal - CHECK IF CHARACTER DEVICE
        AX = 1223h
        SDA+218h (DOS 3.10-3.30) = eight-character blank-padded name
        SDA+22Bh (DOS 4.0x) = 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 (assumes DS=SS=DOS CS)
SeeAlso: INT 21/AX=5D06h,5D0Bh