3Com Corporation
                      EtherDisk Diskette for the 
               EtherLink 16 and EtherLink 16 TP Adapters
                                        
                Diagnostic Program Instructions Summary



 Overview
 --------
 
  The diagnostic program for the EtherLink 16 adapter is designed to make sure
  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 tests check the adapter's ability to transmit 
  data on the network and require that the adapter be connected to a loopback 
  plug (coax version only) or to a network.  The Group 3 tests 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.


 Starting the Diagnostic Program
 -------------------------------
 
  The computer containing the EtherLink 16 adapter to be tested 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 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 program:

  -   Automatically from the "MENU.BAT" program, by selecting the options in 
      the Diagnostics submenu.

  -   Manually, from the root directory of the Etherdisk diskette by typing
      the following command:
  
      3C507 [/B:xxx] [/C]

      The brackets indicate that the /B and /C switches are optional.

      Use the /B switch to change the current I/O base address setting
      and to assign a new I/O base address, where xxx represents a 3-digit 
      hexadecimal address.

      Use the /C switch to perform continuous testing of the adapter.


 Using the Diagnostic Program
 ----------------------------

 The menus and forms that make up the diagnostic program will guide you
 through the testing.  The following keys can be used during the diagnostic 
 program execution:
 
 
      Key              Function
      ---              --------
 
      [Up-arrow]       Moves highlight within menus and forms
      [Down-arrow]
 
      [Enter]          Selects highlighted item
      [Return]
 
      [F1]             Gives help information about the highlighted item
 
      [Esc]            Returns to previous menu or form
                       Stops a test
                       Stops echo server operation
 
 
 If the adapter fails the diagnostic program, return to the diagnostic 
 information menu and select "Troubleshooting" for troubleshooting
 procedures.
 
 
 Further Information
 -------------------
 
 For more information about the diagnostic program and how it should be used,
 refer to the EtherLink 16 Adapter Guide or the EtherLink 16 TP Adapter
 Guide, or select "Miscellaneous Information" from the main menu.
 
 
 
 
 (%VER  Diagnostic Program Instructions Summary v2.0a)