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       # DIGITAL EQUIPMENT CORPORATION
       
          VENTURIS 486 (VER. 2.0)
       
          Device Type      Mainboard                                     
          Processor        AM486DX2/P24D/P24T                            
          Processor Speed  25/33/40/50(internal)/66(internal)MHz         
          Chip Set         Unidentified                                  
          Video Chip Set   S3                                            
          Maximum Onboard  68MB                                          
          Memory           
          Maximum Video    1MB                                           
          Memory           
          Cache            128/256KB                                     
          BIOS             Phoenix                                       
          Dimensions       254mm x 218mm                                 
          I/O Options      Floppy drive interface, IDE interfaces (2),   
                           parallel port, PS/2 mouse port, serial ports  
                           (2), VGA port, riser slot                     
          NPU Options      None                                          
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose         | Location | Purpose            | Location |
          |-----------------+----------+--------------------+----------|
          | VGA port        |   CN1    | Floppy drive       |   CN6    |
          |                 |          | interface          |          |
          |-----------------+----------+--------------------+----------|
          | Serial port     |   CN2    | IDE interface      |   CN7    |
          |-----------------+----------+--------------------+----------|
          | Serial port     |   CN3    | IDE interface      |   CN8    |
          |-----------------+----------+--------------------+----------|
          | Parallel port   |   CN4    | Riser slot         |   SL1    |
          |-----------------+----------+--------------------+----------|
          | PS/2 mouse port |   CN5    |                    |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function               | Label |   Position   |
          |-------------------------------------+-------+--------------|
          | » | Write through enabled           |  J1   |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | Write back enabled              |  J1   |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | Snoop select enabled            |  J18  |  Pins 1 & 2  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          |   | Snoop select disabled           |  J18  |  Pins 2 & 3  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          | » | On board video enabled          |  J19  |  Pins 2 & 3  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          |   | On board video disabled         |  J19  |  Pins 1 & 2  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          | » | Recovery mode normal operation  |  J21  |     Open     |
          |---+---------------------------------+-------+--------------|
          |   | Recovery mode enabled           |  J21  |    Closed    |
          |---+---------------------------------+-------+--------------|
          | » | Password normal operation       |  J23  |     Open     |
          |---+---------------------------------+-------+--------------|
          |   | Password clear                  |  J23  |    Closed    |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     |  SL2  | Unidentified |
          |   | alter                           |       |              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     SIMM CONFIGURATION                     |
          |------------------------------------------------------------|
          |    Size     |    Bank 0    |    Bank 1     |    Bank 2     |
          |-------------+--------------+---------------+---------------|
          |     4MB     |     4MB      |     None      |     None      |
          |-------------+--------------+---------------+---------------|
          |     8MB     |     4MB      |  (1) 1M x 36  |     None      |
          |-------------+--------------+---------------+---------------|
          |    12MB     |     4MB      |  (1) 1M x 36  |  (1) 1M x 36  |
          |-------------+--------------+---------------+---------------|
          |    12MB     |     4MB      |  (1) 2M x 36  |     None      |
          |-------------+--------------+---------------+---------------|
          |    16MB     |     4MB      |  (1) 1M x 36  |  (1) 2M x 36  |
          |-------------+--------------+---------------+---------------|
          |    20MB     |     4MB      |  (1) 2M x 36  |  (1) 2M x 36  |
          |-------------+--------------+---------------+---------------|
          |    20MB     |     4MB      |  (1) 4M x 36  |     None      |
          |-------------+--------------+---------------+---------------|
          |    24MB     |     4MB      |  (1) 1M x 36  |  (1) 4M x 36  |
          |-------------+--------------+---------------+---------------|
          |    28MB     |     4MB      |  (1) 2M x 36  |  (1) 4M x 36  |
          |-------------+--------------+---------------+---------------|
          |    36MB     |     4MB      |  (1) 4M x 36  |  (1) 4M x 36  |
          |-------------+--------------+---------------+---------------|
          |    36MB     |     4MB      |  (1) 8M x 36  |     None      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 SIMM CONFIGURATION (CON’T)                 |
          |------------------------------------------------------------|
          |  Size  |  Bank 0  |         Bank 1         |    Bank 2     |
          |--------+----------+------------------------+---------------|
          |  40MB  |   4MB    |      (1) 1M x 36       |  (1) 8M x 36  |
          |--------+----------+------------------------+---------------|
          |  44MB  |   4MB    |      (1) 2M x 36       |  (1) 8M x 36  |
          |--------+----------+------------------------+---------------|
          |  52MB  |   4MB    |      (1) 4M x 36       |  (1) 8M x 36  |
          |--------+----------+------------------------+---------------|
          |  68MB  |   4MB    |      (1) 8M x 36       |  (1) 8M x 36  |
          |------------------------------------------------------------|
          |      Note: Bank 0 is factory installed and is not          |
          |      configurable. The location is unidentified.           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |       Bank 1       |
          |------------------+--------------------+--------------------|
          |      128KB       |    (4) 32K x 8     |        None        |
          |------------------+--------------------+--------------------|
          |      256KB       |    (4) 32K x 8     |    (4) 32K x 8     |
          |------------------------------------------------------------|
          | Note: The location of the cache is unidentified.           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          |       Size       |         J2         |         J4         |
          |------------------+--------------------+--------------------|
          |      128KB       | Pins 1 & 2 closed  | Pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |      256KB       | Pins 2 & 3 closed  | Pins 2 & 3 closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 VIDEO MEMORY CONFIGURATION                 |
          |------------------------------------------------------------|
          | Note: Board is factory installed with 1MB cache. The       |
          | location is unidentified.                                  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CPU SPEED SELECTION                     |
          |------------------------------------------------------------|
          |       Speed        |        J14        |        J15        |
          |--------------------+-------------------+-------------------|
          |       25MHz        |       Open        |       Open        |
          |--------------------+-------------------+-------------------|
          |       33MHz        |       Open        |      Closed       |
          |--------------------+-------------------+-------------------|
          |       40MHz        |      Closed       |       Open        |
          |--------------------+-------------------+-------------------|
          |       50iMHz       |       Open        |       Open        |
          |--------------------+-------------------+-------------------|
          |       66iMHz       |       Open        |      Closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     CPU TYPE SELECTION                     |
          |------------------------------------------------------------|
          |        Type        |         J9         |       J35        |
          |--------------------+--------------------+------------------|
          |      AM486DX2      | Pins 2 & 3 closed  |      Closed      |
          |--------------------+--------------------+------------------|
          |        P24D        | Pins 1 & 2 closed  |       Open       |
          |--------------------+--------------------+------------------|
          |        P24T        | Pins 1 & 2 closed  |       Open       |
          +------------------------------------------------------------+