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The serial device operates like the other Amiga devices.  To use it, you
must first open the serial device, then send I/O requests to it, and then
close it when finished.  See the "Introduction to Amiga System Devices"
chapter for general information on device usage.

The I/O request used by the serial device is called IOExtSer.

    struct IOExtSer
        struct   IOStdReq IOSer;
        ULONG    io_CtlChar;    /* control characters */
        ULONG    io_RBufLen;    /* length in bytes of serial read buffer */
        ULONG    io_ExtFlags;   /* additional serial flags */
        ULONG    io_Baud;       /* baud rate */
        ULONG    io_BrkTime;    /* duration of break in microseconds */
        struct   iOTArray  io_TermArray;  /* termination character array */
        UBYTE    io_ReadLen;    /* number of bits per read character */
        UBYTE    io_WriteLen;   /* number of bits per write character */
        UBYTE    io_StopBits;   /* number of stopbits for read */
        UBYTE    io_SerFlags;   /* serial device flags */
        UWORD    io_Status;     /* status of serial port and lines */

See the include file devices/serial.h for the complete structure

 Opening The Serial Device 		 Writing To The Serial Device 
 Reading From The Serial Device 	 Closing The Serial Device 

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