INT 14 - Alloy MW386 v2+ - CHANGE PHYSICAL PORT PARAMETERS
        AH = 24h
        CX = physical I/O port number
        DS:DX -> configuration table (see below)
Return: AH = 00h
Note:   invalid port numbers are merely ignored
SeeAlso: INT 17/AH=96h

Format of configuration table:
Offset  Size    Description
 00h    BYTE    baud rate (see below)
 01h    BYTE    data bits (00h=5, 01h=6, 02h=7, 03h=8)
 02h    BYTE    parity (00h none, 01h odd, 02h even)
 03h    BYTE    stop bits (00h=1, 01h=2)
 04h    BYTE    receive flow control
                00h none, 01h XON/XOFF, 02h DTR/DSR, 03h XPC, 04h RTS/CTS
 05h    BYTE    transmit flow control (as for receive)

Values for baud rate:
 00h    38400
 01h    19200
 02h    9600
 03h    7200
 04h    4800
 05h    3600
 06h    2400
 07h    2000
 08h    1200
 09h    600
 0Ah    300
 0Bh    150
 0Ch    134.5

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