COMTROL CORPORATION
===================

   HOSTESS CLUSTER

   Category               Serial controller                       
   Chipset Controller     NEC                                     
   I /O Options Supported Serial ports (16)                       
   Maximum Onboard Memory 2MB                                     

<gopher://bitreich.org/I/th99/i/C-D/50842-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |       Purpose       | Location |    Purpose     | Location |
   |---------------------+----------+----------------+----------|
   |   100-pin serial    |   CN1    | 8-port upgrade |   CN3    |
   | interface connector |          | card connector |          |
   |---------------------+----------+----------------+----------|
   | 8-port upgrade card |   CN2    |                |          |
   |      connector      |          |                |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               RS-232/RS-422 SELECT - JP1-JP8               |
   |------------------------------------------------------------|
   |  Setting   |   Jumper A   | Jumper B | Jumper C | Jumper D |
   |------------+--------------+----------+----------+----------|
   |>> | RS-232 |  Pins 1 & 2  | Pins 1 & | Pins 1 & | Pins 1 & |
   |   |        |    closed    | 2 closed | 2 closed | 2 closed |
   |---+--------+--------------+----------+----------+----------|
   |   | RS-422 |  Pins 2 & 3  | Pins 2 & | Pins 2 & | Pins 2 & |
   |   |        |    closed    | 3 closed | 3 closed | 3 closed |
   |------------------------------------------------------------|
   | Note:JP1-JP8 correspond to serial ports 1 - 8,             |
   | respectively. Jumper D does not exist on JP5-JP8.          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               PORT 1 FULL/HALF DUPLEX SELECT               |
   |------------------------------------------------------------|
   |            Setting            |            FD1             |
   |-------------------------------+----------------------------|
   |       Half-duplex mode        |     Pins 1 & 2 closed      |
   |-------------------------------+----------------------------|
   |    Full-duplex mode (DMA1)    |     Pins 2 & 3 closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               PORT 2 FULL/HALF DUPLEX SELECT               |
   |------------------------------------------------------------|
   |            Setting            |            FD2             |
   |-------------------------------+----------------------------|
   |       Half-duplex mode        |     Pins 1 & 2 closed      |
   |-------------------------------+----------------------------|
   |    Full-duplex mode (DMA2)    |     Pins 2 & 3 closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |  PORTS 1 &AMP; 2 RS-232 SYNCHRONOUS/ASYNCHRONOUS SELECT -  |
   |                            JP9                             |
   |------------------------------------------------------------|
   |    Setting     | Jumper A - Jumper E | Jumper F - Jumper M |
   |----------------+---------------------+---------------------|
   |  Asynchronous  |  Pins 1 & 2 closed  |  Pins 1 & 2 closed  |
   |----------------+---------------------+---------------------|
   |  Synchronous   |  Pins 2 & 3 closed  |  Pins 1 & 2 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |          PORT 1 DATA TERMINAL READY (DTR) OPTIONS          |
   |------------------------------------------------------------|
   |        Setting         |      JP14       |      JP15       |
   |------------------------+-----------------+-----------------|
   |>> |   Normal RS-232    |     Closed      |      Open       |
   |---+--------------------+-----------------+-----------------|
   |   | Synchronous RS-232 |      Open       |     Closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |          PORT 2 DATA TERMINAL READY (DTR) OPTIONS          |
   |------------------------------------------------------------|
   |        Setting         |      JP16       |      JP17       |
   |------------------------+-----------------+-----------------|
   |>> |   Normal RS-232    |     Closed      |      Open       |
   |---+--------------------+-----------------+-----------------|
   |   | Synchronous RS-232 |      Open       |     Closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        I/O ADDRESS                         |
   |------------------------------------------------------------|
   |     Setting     |    SW1/1     |    SW1/2    |    SW1/3    |
   |-----------------+--------------+-------------+-------------|
   |>> |    218h     |     Off      |     Off     |     Off     |
   |---+-------------+--------------+-------------+-------------|
   |   |    21Ch     |      On      |     Off     |     Off     |
   |---+-------------+--------------+-------------+-------------|
   |   |    238h     |     Off      |     On      |     Off     |
   |---+-------------+--------------+-------------+-------------|
   |   |    23Ch     |      On      |     On      |     Off     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |         Memory Size          |           Bank 0            |
   |------------------------------+-----------------------------|
   |>>  |          128KB          |         (2) 64K x 9         |
   |----+-------------------------+-----------------------------|
   |    |           2MB           |         (2) 1M x 9          |
   +------------------------------------------------------------+