DIGITAL EQUIPMENT CORPORATION
=============================

   PC 5500

   Device Type        Mainboard                                   
   Processor          Pentium II                                  
   Processor Speed    233/266/300/333/366/400MHz                  
   Chip Set           Intel                                       
   Video Chip Set     ESS                                         
   Maximum Onboard    256MB (EDO supported)                       
   Memory             
   Maximum Video      2MB                                         
   Memory             
   Cache              512KB (located on Pentium II CPU)           
   BIOS               Unidentified                                
   Dimensions         254mm x 218mm                               
   I/O Options (CPU)  Parallel port, PS/2 mouse port, serial      
                      ports (2), VGA feature connector, VGA port, 
                      USB connectors (2)                          
   I/O Options        32-bit PCI slots (3), IDE interfaces (2),   
   (backplane)        floppy drive interface, game/MIDI port,     
                      parallel port, 100Base-T connector,         
                      10Base-2 connector, audio in - CD-ROM,      
                      fax/modem connector                         
   NPU Options        None                                        

<gopher://bitreich.org/I/th99/m/C-D/34959-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose         | Location | Purpose            | Location |
   |-----------------+----------+--------------------+----------|
   | Serial port     |   CN1    | PS/2 mouse port    |   CN6    |
   |-----------------+----------+--------------------+----------|
   | Serial port     |   CN2    | Parallel port      |   CN7    |
   |-----------------+----------+--------------------+----------|
   | USB connector 1 |   CN3    | VGA feature        |   CN8    |
   |                 |          | connector          |          |
   |-----------------+----------+--------------------+----------|
   | USB connector 2 |   CN4    | Video upgrade      |   CN9    |
   |                 |          | connectors         |          |
   |-----------------+----------+--------------------+----------|
   | VGA port        |   CN5    |                    |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |             Function             | Label |    Position     |
   |----------------------------------+-------+-----------------|
   |>> | Boot block update disabled   |  J27  |   Pins 1 & 2    |
   |   |                              |       |     closed      |
   |---+------------------------------+-------+-----------------|
   |   | Boot block update enabled    |  J27  |   Pins 2 & 3    |
   |   |                              |       |     closed      |
   |---+------------------------------+-------+-----------------|
   |>> | Password disabled            | SW1/5 |       Off       |
   |---+------------------------------+-------+-----------------|
   |   | Password enabled             | SW1/5 |       On        |
   |---+------------------------------+-------+-----------------|
   |>> | BIOS normal operation        | SW1/6 |       Off       |
   |---+------------------------------+-------+-----------------|
   |   | BIOS recovery mode           | SW1/6 |       On        |
   |---+------------------------------+-------+-----------------|
   |>> | CMOS memory normal operation | SW1/7 |       Off       |
   |---+------------------------------+-------+-----------------|
   |   | CMOS memory clear            | SW1/7 |       On        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     SIMM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  |   Bank 0    |   Bank 1   |   Bank 2   |   Bank 3   |
   |-------+-------------+------------+------------+------------|
   | 32MB  | (2) 4M x 36 |    None    |    None    |    None    |
   |-------+-------------+------------+------------+------------|
   | 32MB  | (2) 2M x 36 |  (2) 2M x  |    None    |    None    |
   |       |             |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 32MB  | (2) 1M x 36 |  (2) 1M x  |  (2) 1M x  |  (2) 1M x  |
   |       |             |     36     |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 40MB  | (2) 4M x 36 |  (2) 1M x  |    None    |    None    |
   |       |             |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 48MB  | (2) 4M x 36 |  (2) 2M x  |    None    |    None    |
   |       |             |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 48MB  | (2) 2M x 36 |  (2) 2M x  |  (2) 2M x  |    None    |
   |       |             |     36     |     36     |            |
   |-------+-------------+------------+------------+------------|
   | 64MB  | (2) 2M x 36 |  (2) 2M x  |  (2) 2M x  |  (2) 2M x  |
   |       |             |     36     |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 64MB  | (2) 8M x 36 |    None    |    None    |    None    |
   |-------+-------------+------------+------------+------------|
   | 64MB  | (2) 4M x 36 |  (2) 4M x  |    None    |    None    |
   |       |             |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 72MB  | (2) 8M x 36 |  (2) 1M x  |    None    |    None    |
   |       |             |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 80MB  | (2) 8M x 36 |  (2) 2M x  |    None    |    None    |
   |       |             |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 96MB  | (2) 8M x 36 |  (2) 4M x  |    None    |    None    |
   |       |             |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 96MB  | (2) 4M x 36 |  (2) 4M x  |  (2) 4M x  |    None    |
   |       |             |     36     |     36     |            |
   |-------+-------------+------------+------------+------------|
   | 128MB |  (2) 16M x  |    None    |    None    |    None    |
   |       |     36      |            |            |            |
   |-------+-------------+------------+------------+------------|
   | 128MB | (2) 8M x 36 |  (2) 8M x  |    None    |    None    |
   |       |             |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 128MB | (2) 4M x 36 |  (2) 4M x  |  (2) 4M x  |  (2) 4M x  |
   |       |             |     36     |     36     |     36     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 SIMM CONFIGURATION (CON'T)                 |
   |------------------------------------------------------------|
   | Size  |   Bank 0    |   Bank 1   |   Bank 2   |   Bank 3   |
   |-------+-------------+------------+------------+------------|
   | 136MB |  (2) 16M x  |  (2) 1M x  |    None    |    None    |
   |       |     36      |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 144MB |  (2) 16M x  |  (2) 2M x  |    None    |    None    |
   |       |     36      |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 152MB |  (2) 16M x  |  (2) 1M x  |  (2) 1M x  |  (2) 1M x  |
   |       |     36      |     36     |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 160MB |  (2) 16M x  |  (2) 4M x  |    None    |    None    |
   |       |     36      |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 176MB |  (2) 16M x  |  (2) 2M x  |  (2) 2M x  |  (2) 2M x  |
   |       |     36      |     36     |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 192MB |  (2) 16M x  |  (2) 8M x  |    None    |    None    |
   |       |     36      |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 192MB | (2) 8M x 36 |  (2) 8M x  |  (2) 8M x  |    None    |
   |       |             |     36     |     36     |            |
   |-------+-------------+------------+------------+------------|
   | 224MB |  (2) 16M x  |  (2) 4M x  |  (2) 4M x  |  (2) 4M x  |
   |       |     36      |     36     |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 256MB |  (2) 32M x  |    None    |    None    |    None    |
   |       |     36      |            |            |            |
   |-------+-------------+------------+------------+------------|
   | 256MB |  (2) 16M x  | (2) 16M x  |    None    |    None    |
   |       |     36      |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 256MB | (2) 8M x 36 |  (2) 8M x  |  (2) 8M x  |  (2) 8M x  |
   |       |             |     36     |     36     |     36     |
   |------------------------------------------------------------|
   | Note: Board accepts EDO memory.                            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Note: 512KB cache is located on the Pentium II CPU.        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 VIDEO MEMORY CONFIGURATION                 |
   |------------------------------------------------------------|
   |      Note: 1MB video memory is factory installed and is    |
   |      not configurable. To increase to 2MB, install upgrade |
   |      module at CN9.                                        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CPU SPEED SELECTION                     |
   |------------------------------------------------------------|
   |CPU speed|  Clock  |Multiplier|SW1/1|SW1/2|SW1/3|SW1/4|SW1/8|
   |         |  speed  |          |     |     |     |     |     |
   |---------+---------+----------+-----+-----+-----+-----+-----|
   | 233MHz  |  66MHz  |   3.5x   | On  | Off | Off | On  | On  |
   |---------+---------+----------+-----+-----+-----+-----+-----|
   | 266MHz  |  66MHz  |    4x    | On  | On  | On  | Off | On  |
   |---------+---------+----------+-----+-----+-----+-----+-----|
   | 300MHz  |  66MHz  |   4.5x   | On  | Off | On  | Off | On  |
   |---------+---------+----------+-----+-----+-----+-----+-----|
   | 333MHz  |  66MHz  |    5x    | On  | On  | Off | Off | On  |
   |---------+---------+----------+-----+-----+-----+-----+-----|
   | 366MHz  |  66MHz  |   5.5x   | On  | Off | Off | Off | On  |
   |---------+---------+----------+-----+-----+-----+-----+-----|
   | 400MHz  |  66MHz  |    6x    | On  | On  | On  | On  | Off |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/m/C-D/34959-2.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose             | Location | Purpose        | Location |
   |---------------------+----------+----------------+----------|
   | Logic board         |   CN1    | Chassis fan    |   CN8    |
   | connectors          |          | power          |          |
   |---------------------+----------+----------------+----------|
   | Power connector     |   CN2    | 5v power       |   CN9    |
   |                     |          | connector      |          |
   |---------------------+----------+----------------+----------|
   | IDE interface 1     |   CN3    | Game/MIDI port |   CN10   |
   |---------------------+----------+----------------+----------|
   | IDE interface 2     |   CN4    | Audio in -     |   CN11   |
   |                     |          | CD-ROM         |          |
   |---------------------+----------+----------------+----------|
   | Floppy drive        |   CN5    | Audio          |   CN12   |
   | interface           |          | connector      |          |
   |---------------------+----------+----------------+----------|
   | 100Base-T connector |   CN6    | 32-bit PCI     |  PC1 -   |
   |                     |          | slots          |   PC3    |
   |---------------------+----------+----------------+----------|
   | 10Base-T/10Base-2   |   CN7    |                |          |
   | connector           |          |                |          |
   +------------------------------------------------------------+