3Com Corporation
               EtherDisk Diskette for the EtherLink III Adapters
           Diagnostic and Configuration Program Instructions Summary



  Overview
  --------

  The diagnostic portion of the Diagnostic and Configuration program
  is designed to make sure that the adapter is installed correctly and
  functioning properly in your computer.  The Group 1 tests check the
  physical components, connectors, and circuitry of the adapter and
  require only that the adapter be installed in the computer.  The 
  Group 2 test check the adapter's ability to transmit data on the 
  network and require that the adapter be connected to a loopback plug 
  or to a network.  The Group 3 test check the adapter's ability to 
  correctly transmit and receive data over the network and require 
  that the adapter be connected to a network on which an echo server 
  has been set up.

  The configuration portion of the program allows you to change the
  configuration parameters for the adapter to fit the specific environment
  in which the adapter is installed.


  Starting the Diagnostic and Configuration Program
  -------------------------------------------------

  The computer containing the adapter to be tested or configured must be
  running DOS.

  NOTE:  If this computer is an operating server, notify all users of the
         server to save their work and log out from the network.  The
         Diagnostic and Configuration program disrupts the normal operation 
         of servers and workstations, so work that is not saved may be lost.

  There are two ways to start the diagnostic and configuration program:

  1.  Automatically from the "MENU.COM" program, by selecting the options in
      the Diagnostic and Configuration submenu.

  2.  Manually, from the root directory of the EtherDisk diskette by typing
      the following command:

      3C509 [command keyword] [parameter list]

      Here 3C509 represents the 3Com diagnostic program name.  The brackets
      indicate that the command keyword and parameter list are optional.

      3C509 without any arguments invokes the program in full windows mode.
      This includes mouse support and context-sensitive help.
      The optional command keywords are:

      CONFIGURE - Configures an adapter either automatically or by using a
                  specified adapter configuration file.

      ECHOSERVER - Enables a designated adapter to function within the echo
                   server.

      HELP - Displays general or command-specific help information.  To get
             command-specific help, enter: 3C509 HELP [command keyword]

      LANGUAGE - Invokes the program in full windows mode using a specified
                 external resource file.  This option provides support for
                 multiple languages via a different resource file for each
                 language supported.

      LIST - Displays a list of installed adapters recognized by this program
             and their assigned adapter numbers.

      RUN - Executes the diagnostic tests, which can also be specified from a
            file, on a selected adapter and writes the results to the screen,
            a file, or a printer.

      You can use the first two characters of a [command keyword] or a
      [parameter identifier] as a shortcut.  For example, 3C509 HE RU means
      3C509 HELP RUN.


  Using the Diagnostic and Configuration Program
  ----------------------------------------------

  The menus and dialog boxes that make up the Diagnostic and Configuration
  program guide you through testing and configuring your adapter.  The lines
  at the bottom of the display tell which keys can be used and the function
  each of them performs.  Context-sensitive help is always available by
  pressing the F1 key.

  If the adapter fails any of the diagnostic tests, see the TROUBLE.TXT file
  in the \DIAG directory on the EtherDisk diskette for troubleshooting
  procedures.


  Further Information
  -------------------

  For more information about the Diagnostic and Configuration program and how
  to use it, refer to the appropriate adapter guide.  The SUPPORT.TXT file in
  the \INFO subdirectory on the EtherDisk diskette provides information about
  obtaining product support for the adapter.

  The TROUBLE.TXT and SUPPORT.TXT files can be automatically displayed and
  printed from the "MENU.BAT" program.


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