INT 16 - Shamrock Software EMAIL - GET CURRENT COMMUNICATIONS PARAMETERS
        AX = 4502h
        DL = port number (01h = COM1)
Return: AX = 4D00h if EMAIL installed on specified port
            BL = current value of serial port's Line Control Register
            BH = flags
                bit 0: ISO code
                bit 1: pause
                bit 2: linefeed
                bit 3: ANSI sequences
            CX = selected country code (33 = France, 49 = Germany, etc)
            DX = baudrate divisor (115200/DX = baudrate)
SeeAlso: AX=4500h

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