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

   CELEBRIS 486

   Device Type   Mainboard                                        
   Processor     80486SX/80486DX/80486DX2/P24D/P24T/P24CT         
   Processor     25/33/50(internal)/66(internal)/100(internal)MHz 
   Speed         
   Chip Set      Unidentified                                     
   Video Chip    Unidentified                                     
   Set           
   Maximum       128MB                                            
   Onboard       
   Memory        
   Maximum Video 1MB                                              
   Memory        
   Cache         256KB                                            
   BIOS          Unidentified                                     
   Dimensions    254mm x 218mm                                    
   I/O Options   Floppy drive interface, IDE interface, PS/2      
                 mouse port, riser slot                           
   NPU Options   None                                             

<gopher://bitreich.org/I/th99/m/C-D/35186-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose        | Location | Purpose             | Location |
   |----------------+----------+---------------------+----------|
   | Chassis fan    |    C1    | PS/2 mouse port     |   CN4    |
   | power          |          |                     |          |
   |----------------+----------+---------------------+----------|
   | Speaker        |    C2    | Floppy drive        |   CN5    |
   |                |          | interface           |          |
   |----------------+----------+---------------------+----------|
   | VGA port       |   CN1    | IDE interface       |   CN6    |
   |----------------+----------+---------------------+----------|
   | Serial port    |   CN2    | Riser slot          |   SL1    |
   |----------------+----------+---------------------+----------|
   | Parallel port  |   CN3    |                     |          |
   |------------------------------------------------------------|
   | Note: VGA & serial port are shown for informational        |
   | purposes only. The location may not be exact.              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Label |  Position  |
   |---------------------------------------+-------+------------|
   |>> | EEPROM write control disabled     |  J24  | Pins 2 & 3 |
   |   |                                   |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | EEPROM write control enabled      |  J24  | Pins 1 & 2 |
   |   |                                   |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |>> | Setup control disabled            |  J25  | Pins 2 & 3 |
   |   |                                   |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | Setup control enabled             |  J25  | Pins 1 & 2 |
   |   |                                   |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |>> | Floppy drive write control        |  J26  | Pins 2 & 3 |
   |   | disabled                          |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | Floppy drive write control        |  J26  | Pins 1 & 2 |
   |   | enabled                           |       |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     SIMM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (1) 2M x 36 |    None     |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 4M x 36 |    None     |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 2M x 36 | (1) 2M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 24MB | (1) 4M x 36 | (1) 2M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 24MB | (1) 2M x 36 | (1) 2M x 36 |  (1) 2M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 24MB | (1) 2M x 36 | (1) 4M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 32MB | (1) 8M x 36 |    None     |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 32MB | (1) 4M x 36 | (1) 2M x 36 |  (1) 2M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 32MB | (1) 4M x 36 | (1) 4M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 32MB | (1) 2M x 36 | (1) 2M x 36 |  (1) 2M x  |  (1) 2M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 40MB | (1) 8M x 36 | (1) 2M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 40MB | (1) 4M x 36 | (1) 2M x 36 |  (1) 2M x  |  (1) 2M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 40MB | (1) 2M x 36 | (1) 4M x 36 |  (1) 4M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 40MB | (1) 2M x 36 | (1) 8M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 48MB | (1) 8M x 36 | (1) 2M x 36 |  (1) 2M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 48MB | (1) 8M x 36 | (1) 4M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 48MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |    None    |
   |      |             |             |     36     |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 SIMM CONFIGURATION (CON'T)                 |
   |------------------------------------------------------------|
   | Size  |   Bank 0    |   Bank 1   |   Bank 2   |   Bank 3   |
   |-------+-------------+------------+------------+------------|
   | 48MB  | (1) 4M x 36 |  (1) 8M x  |    None    |    None    |
   |       |             |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 56MB  | (1) 8M x 36 |  (1) 2M x  |  (1) 2M x  |  (1) 2M x  |
   |       |             |     36     |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 56MB  | (1) 2M x 36 |  (1) 4M x  |  (1) 4M x  |  (1) 4M x  |
   |       |             |     36     |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 64MB  | (1) 8M x 36 |  (1) 4M x  |  (1) 4M x  |    None    |
   |       |             |     36     |     36     |            |
   |-------+-------------+------------+------------+------------|
   | 64MB  | (1) 8M x 36 |  (1) 8M x  |    None    |    None    |
   |       |             |     36     |            |            |
   |-------+-------------+------------+------------+------------|
   | 64MB  | (1) 4M x 36 |  (1) 4M x  |  (1) 4M x  |  (1) 4M x  |
   |       |             |     36     |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 72MB  | (1) 2M x 36 |  (1) 8M x  |  (1) 8M x  |    None    |
   |       |             |     36     |     36     |            |
   |-------+-------------+------------+------------+------------|
   | 80MB  | (1) 8M x 36 |  (1) 4M x  |  (1) 4M x  |  (1) 4M x  |
   |       |             |     36     |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 80MB  | (1) 4M x 36 |  (1) 8M x  |  (1) 8M x  |    None    |
   |       |             |     36     |     36     |            |
   |-------+-------------+------------+------------+------------|
   | 96MB  | (1) 8M x 36 |  (1) 8M x  |  (1) 8M x  |    None    |
   |       |             |     36     |     36     |            |
   |-------+-------------+------------+------------+------------|
   | 104MB | (1) 2M x 36 |  (1) 8M x  |  (1) 8M x  |  (1) 8M x  |
   |       |             |     36     |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 112MB | (1) 4M x 36 |  (1) 8M x  |  (1) 8M x  |  (1) 8M x  |
   |       |             |     36     |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 128MB | (1) 8M x 36 |  (1) 8M x  |  (1) 8M x  |  (1) 8M x  |
   |       |             |     36     |     36     |     36     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Note: 256KB cache is factory installed and is not          |
   | configurable. The location is unidentified.                |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 VIDEO MEMORY CONFIGURATION                 |
   |------------------------------------------------------------|
   | Note: 1MB video memory is factory installed and is not     |
   | configurable. The location is unidentified.                |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CPU SPEED SELECTION                     |
   |------------------------------------------------------------|
   |           Speed            |              J6               |
   |----------------------------+-------------------------------|
   |           25MHz            |       Pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |           33MHz            |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |           50iMHz           |       Pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |           66iMHz           |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |          100iMHz           |       Pins 1 & 2 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     CPU TYPE SELECTION                     |
   |------------------------------------------------------------|
   |             Type              |            J50             |
   |-------------------------------+----------------------------|
   |            80486SX            |            Open            |
   |-------------------------------+----------------------------|
   |            80486DX            |            Open            |
   |-------------------------------+----------------------------|
   |           80486DX2            |            Open            |
   |-------------------------------+----------------------------|
   |             P24D              |           Closed           |
   |-------------------------------+----------------------------|
   |             P24T              |           Closed           |
   |-------------------------------+----------------------------|
   |             P24CT             |           Closed           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               SERIAL BOOT CONTROL SELECTION                |
   |------------------------------------------------------------|
   |     Setting      |         J7         |         J8         |
   |------------------+--------------------+--------------------|
   |     Disabled     | Pins 2 & 3 closed  | Pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |     Enabled      | Pins 1 & 2 closed  | Pins 1 & 2 closed  |
   +------------------------------------------------------------+