U.S. ROBOTICS, INC.
===================

   MICROLINK 2400

   Modem Type               Data (synchronous/asynchronous)       
   Maximum Data Rate        2400bps                               
   Data Bus                 8-bit ISA                             
   Data Modulation Protocol Bell 103A/212A                        
                                                                  
                            ITU-T V.22                            

<gopher://bitreich.org/I/th99/t/U-Z/51261-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |      Purpose      | Location |     Purpose      | Location |
   |-------------------+----------+------------------+----------|
   | Line out          |   CN1    | Line in          |   CN2    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         DTR SIGNAL                         |
   |------------------------------------------------------------|
   | Setting                       |           SW1/1            |
   |-------------------------------+----------------------------|
   |>> DTR forced high             |             On             |
   |-------------------------------+----------------------------|
   | DTR normal                    |            Off             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        RESULT CODES                        |
   |------------------------------------------------------------|
   | Setting                       |           SW1/2            |
   |-------------------------------+----------------------------|
   |>> Verbose codes enabled       |            Off             |
   |-------------------------------+----------------------------|
   | Numeric result codes enabled  |             On             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    RESULT CODES DISPLAY                    |
   |------------------------------------------------------------|
   | Setting                       |           SW1/3            |
   |-------------------------------+----------------------------|
   | Display disabled              |            Off             |
   |-------------------------------+----------------------------|
   |>> Display enabled             |             On             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   ECHO COMMANDS DISPLAY                    |
   |------------------------------------------------------------|
   | Setting                       |           SW1/4            |
   |-------------------------------+----------------------------|
   |>> Local echo enabled          |            Off             |
   |-------------------------------+----------------------------|
   | Local echo disabled           |             On             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        AUTO ANSWER                         |
   |------------------------------------------------------------|
   | Setting                              |        SW1/5        |
   |--------------------------------------+---------------------|
   |>> Modem doe not answer on first ring |         On          |
   |--------------------------------------+---------------------|
   | Modem answers on first ring          |         Off         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       CARRIER DETECT                       |
   |------------------------------------------------------------|
   | Setting                       |           SW1/6            |
   |-------------------------------+----------------------------|
   |>> CD normal                   |            Off             |
   |-------------------------------+----------------------------|
   | CD forced high                |             On             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  MULTI-LINE INSTALLATION                   |
   |------------------------------------------------------------|
   | Setting                       |           SW1/7            |
   |-------------------------------+----------------------------|
   |>> Single phone connected      |            Off             |
   |-------------------------------+----------------------------|
   | Multiple phones connected     |             On             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       AT COMMAND SET                       |
   |------------------------------------------------------------|
   | Setting                       |           SW1/8            |
   |-------------------------------+----------------------------|
   |>> AT command set enabled      |             On             |
   |-------------------------------+----------------------------|
   | AT command set disabled       |            Off             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        ESCAPE CODE                         |
   |------------------------------------------------------------|
   | Setting                                            | SW1/9 |
   |----------------------------------------------------+-------|
   |>> Go to command mode and display OK result code    |  On   |
   | when escape character is received                  |       |
   |----------------------------------------------------+-------|
   | Disconnect, go to command mode and display NO      |  Off  |
   | CARRIER when escape character is received          |       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                           VOLUME                           |
   |------------------------------------------------------------|
   | Setting                      |           SW1/10            |
   |------------------------------+-----------------------------|
   |>> High                       |             Off             |
   |------------------------------+-----------------------------|
   | Low                          |             On              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 BASE I/O ADDRESS SELECTION                 |
   |------------------------------------------------------------|
   |      Address       |        J3        |         J4         |
   |--------------------+------------------+--------------------|
   |    COM1: (3F8h)    |       Off        | Pins 2 & 3 closed  |
   |--------------------+------------------+--------------------|
   |    COM2: (2F8h)    |        On        | Pins 2 & 3 closed  |
   |--------------------+------------------+--------------------|
   |    COM3: (3E8h)    |       Off        | Pins 1 & 2 closed  |
   |--------------------+------------------+--------------------|
   |    COM4: (2E8h)    |        On        | Pins 1 & 2 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         INTERRUPT                          |
   |------------------------------------------------------------|
   |            IRQ             |              J5               |
   |----------------------------+-------------------------------|
   |             4              |       Pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |             3              |       Pins 1 & 2 closed       |
   +------------------------------------------------------------+

                     Proprietary AT Command Set

           See document V1260 for a full command summary.