INT 7F - Alloy MW386 - GET TERMINAL PARAMETERS
        AH = 3Ah
        DL = user number (FFh = caller)
        DH = machine number
Return: CF clear if successful
            AH = terminal driver number
            AL = baud rate (00h = 38400, 01h = 19200, etc)
            CL = parity (00h none, 01h even, 02h odd)
            CH = handshaking (00h none, 01h XON/XOFF, 02h DTR/DSR, 03h XPC)
        CF set if invalid user number