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       # XINETRON, INC.
       
          XINET LS3251
       
          Processor         80386DX                                      
          Processor Speed   25MHz                                        
          Chip Set          C & T                                        
          Max. Onboard DRAM 16MB                                         
          SRAM Cache        None                                         
          BIOS              Award                                        
          Dimensions        355mm x 304mm                                
          I/O Options       AUI network interface, BNC network           
                            interface, floppy drive interface, IDE       
                            interface, parallel port, serial ports (2),  
                            game port                                    
          NPU Options       80387DX                                      
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose             | Location | Purpose        | Location |
          |---------------------+----------+----------------+----------|
          | AUI ethernet        |    C1    | Game port      |    C6    |
          | interface           |          |                |          |
          |---------------------+----------+----------------+----------|
          | BNC ethernet        |    C2    | Floppy drive   |    C7    |
          | interface           |          | interface      |          |
          |---------------------+----------+----------------+----------|
          | Parallel port       |    C3    | IDE interface  |    C8    |
          |---------------------+----------+----------------+----------|
          | Serial port (COM2)  |    C4    | Reset switch   |   JP7    |
          |---------------------+----------+----------------+----------|
          | Serial port (COM1)  |    C5    |                |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |            Function             |   Jumper    |  Position  |
          |---------------------------------+-------------+------------|
          | » | Monitor type select         |     JP2     | pins 2 & 3 |
          |   | monochrome                  |             |   closed   |
          |---+-----------------------------+-------------+------------|
          |   | Monitor type select color   |     JP2     | pins 1 & 2 |
          |   |                             |             |   closed   |
          |---+-----------------------------+-------------+------------|
          | » | CPU speed select from       |    JP13     | pins 1 & 2 |
          |   | keyboard                    |             |   closed   |
          |---+-----------------------------+-------------+------------|
          |   | CPU speed select fast       |    JP13     | pins 2 & 3 |
          |   |                             |             |   closed   |
          |---+-----------------------------+-------------+------------|
          | » | Floppy drive interface      |    JP306    | pins 2 & 3 |
          |   | enabled                     |             |   closed   |
          |---+-----------------------------+-------------+------------|
          |   | Floppy drive interface      |    JP306    | pins 1 & 2 |
          |   | disabled                    |             |   closed   |
          |---+-----------------------------+-------------+------------|
          | » | IDE interface enabled       | J312 & J313 | pins 2 & 3 |
          |   |                             |             |   closed   |
          |---+-----------------------------+-------------+------------|
          |   | IDE interface disabled      | J312 & J313 | pins 1 & 2 |
          |   |                             |             |   closed   |
          |---+-----------------------------+-------------+------------|
          | » | Pipeline mode enabled       |    JP12     | pins 1 & 2 |
          |   |                             |             |   closed   |
          |---+-----------------------------+-------------+------------|
          |   | Pipeline mode disabled      |    JP12     | pins 2 & 3 |
          |   |                             |             |   closed   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 SERIAL PORT CONFIGURATION                  |
          |------------------------------------------------------------|
          | COM1 (C5) | COM2 (C4) |   JP303    |   JP304   |   JP305   |
          |-----------+-----------+------------+-----------+-----------|
          |  Enabled  |  Enabled  | pins 2 & 3 | pins 2 &  | pins 2 &  |
          |           |           |   closed   | 3 closed  | 3 closed  |
          |-----------+-----------+------------+-----------+-----------|
          |  Enabled  | Disabled  | pins 2 & 3 | pins 1 &  | pins 2 &  |
          |           |           |   closed   | 2 closed  | 3 closed  |
          |-----------+-----------+------------+-----------+-----------|
          | Disabled  |  Enabled  | pins 1 & 2 | pins 2 &  | pins 2 &  |
          |           |           |   closed   | 3 closed  | 3 closed  |
          |-----------+-----------+------------+-----------+-----------|
          | Disabled  | Disabled  | pins 1 & 2 | pins 1 &  | pins 1 &  |
          |           |           |   closed   | 2 closed  | 2 closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |              PARALLEL PORT (C3) CONFIGURATION              |
          |------------------------------------------------------------|
          |   LPT    | I/O Address |      JP301      |      JP302      |
          |----------+-------------+-----------------+-----------------|
          |  LPT 1   |    3BCh     |   pins 1 & 2    |   pins 2 & 3    |
          |          |             |     closed      |     closed      |
          |----------+-------------+-----------------+-----------------|
          |  LPT 2   |    378h     |   pins 2 & 3    |   pins 2 & 3    |
          |          |             |     closed      |     closed      |
          |----------+-------------+-----------------+-----------------|
          |  LPT 3   |    278h     |   pins 2 & 3    |   pins 1 & 2    |
          |          |             |     closed      |     closed      |
          |----------+-------------+-----------------+-----------------|
          | Disabled |     N/A     |   pins 1 & 2    |   pins 1 & 2    |
          |          |             |     closed      |     closed      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             ETHERNET CABLE TYPE CONFIGURATION              |
          |------------------------------------------------------------|
          |          Cable Type           | JP102  |     J161-J166     |
          |-------------------------------+--------+-------------------|
          | » |            BNC            | Closed | pins 1 & 2 closed |
          |---+---------------------------+--------+-------------------|
          |   | AUI transceiver via 9-pin |  Open  | pins 2 & 3 closed |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |          ETHERNET INTERRUPT REQUEST CONFIGURATION          |
          |------------------------------------------------------------|
          |   Channel    |   J111    |   J112    |   J113   |   J114   |
          |--------------+-----------+-----------+----------+----------|
          |   |  IRQ 3   |   Open    |  Closed   |   Open   |   Open   |
          |---+----------+-----------+-----------+----------+----------|
          |   |  IRQ 2   |  Closed   |   Open    |   Open   |   Open   |
          |---+----------+-----------+-----------+----------+----------|
          |   |  IRQ 4   |   Open    |   Open    |  Closed  |   Open   |
          |---+----------+-----------+-----------+----------+----------|
          | » |  IRQ 5   |   Open    |   Open    |   Open   |  Closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |          ETHERNET I/O BASE ADDRESS CONFIGURATION           |
          |------------------------------------------------------------|
          |   Address   |   J121    |   J122    |   J123    |   J124   |
          |-------------+-----------+-----------+-----------+----------|
          | » |  320h   |   Open    |  Closed   |   Open    |   Open   |
          |---+---------+-----------+-----------+-----------+----------|
          |   |  300h   |  Closed   |   Open    |   Open    |   Open   |
          |---+---------+-----------+-----------+-----------+----------|
          |   |  340h   |   Open    |   Open    |  Closed   |   Open   |
          |---+---------+-----------+-----------+-----------+----------|
          |   |  360h   |   Open    |   Open    |   Open    |  Closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |       ETHERNET BOOT ROM MEMORY ADDRESS CONFIGURATION       |
          |------------------------------------------------------------|
          |      Address      |    J131     |    J132     |    J133    |
          |-------------------+-------------+-------------+------------|
          | »   |   CC000h    |    Open     |   Closed    |    Open    |
          |-----+-------------+-------------+-------------+------------|
          |     |   C8000h    |   Closed    |    Open     |    Open    |
          |-----+-------------+-------------+-------------+------------|
          |     |   D0000h    |    Open     |    Open     |   Closed   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     NPU CONFIGURATION                      |
          |------------------------------------------------------------|
          |       Mode        |        JP4         |       JP11        |
          |-------------------+--------------------+-------------------|
          | » |   Disabled    | pins 2 & 3 closed  | pins 2 & 3 closed |
          |---+---------------+--------------------+-------------------|
          |   | Asynchronous  | pins 1 & 2 closed  | pins 2 & 3 closed |
          |---+---------------+--------------------+-------------------|
          |   |  Synchronous  | pins 1 & 2 closed  | pins 1 & 2 closed |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          | Size |  Bank 0  |  Bank 1  | Bank 2  | Bank 3  |   JP20    |
          |------+----------+----------+---------+---------+-----------|
          | 1MB  | (4) 256K |   NONE   |  NONE   |  NONE   |    N/A    |
          |      |   x 9    |          |         |         |           |
          |------+----------+----------+---------+---------+-----------|
          | 2MB  | (4) 256K | (4) 256K |  NONE   |  NONE   |    N/A    |
          |      |   x 9    |   x 9    |         |         |           |
          |------+----------+----------+---------+---------+-----------|
          | 4MB  | (4) 256K | (4) 256K |   (4)   |   (4)   | pins 1 &  |
          |      |   x 9    |   x 9    | 256K x  | 256K x  | 2 closed  |
          |      |          |          |    9    |    9    |           |
          |------+----------+----------+---------+---------+-----------|
          | 4MB  | (4) 1M x |   NONE   |  NONE   |  NONE   |    N/A    |
          |      |    9     |          |         |         |           |
          |------+----------+----------+---------+---------+-----------|
          | 8MB  | (4) 1M x | (4) 1M x |  NONE   |  NONE   |    N/A    |
          |      |    9     |    9     |         |         |           |
          |------+----------+----------+---------+---------+-----------|
          | 10MB | (4) 1M x | (4) 1M x |   (4)   |   (4)   | pins 1 &  |
          |      |    9     |    9     | 256K x  | 256K x  | 2 closed  |
          |      |          |          |    9    |    9    |           |
          |------+----------+----------+---------+---------+-----------|
          | 10MB | (4) 256K | (4) 256K | (4) 1M  | (4) 1M  | pins 2 &  |
          |      |   x 9    |   x 9    |   x 9   |   x 9   | 3 closed  |
          |------+----------+----------+---------+---------+-----------|
          | 16MB | (4) 1M x | (4) 1M x | (4) 1M  | (4) 1M  | pins 2 &  |
          |      |    9     |    9     |   x 9   |   x 9   | 3 closed  |
          +------------------------------------------------------------+