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

   DECPC LPX

   Processor        80486SX/80486DX/80486DX2                      
   Processor Speed  25/33/40/50(internal)/50/66(internal)MHz      
   Chip Set         Unidentified                                  
   Video Chip Set   None                                          
   Maximum Onboard  64MB                                          
   Memory           
   Maximum Video    None                                          
   Memory           
   Cache            128/256KB                                     
   BIOS             Unidentified                                  
   Dimensions       254mm x 218mm                                 
   I/O Options      32-bit VESA local bus slots (2), floppy drive 
                    interface, IDE interface, parallel port, PS/2 
                    mouse port, serial ports (2)                  
   NPU Options      None                                          

<gopher://bitreich.org/I/th99/m/C-D/34204-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose         | Location | Purpose            | Location |
   |-----------------+----------+--------------------+----------|
   | Parallel port   |   CN1    | IDE interface      |   CN5    |
   |-----------------+----------+--------------------+----------|
   | Serial port     |   CN2    | Floppy drive       |   CN6    |
   |                 |          | interface          |          |
   |-----------------+----------+--------------------+----------|
   | Serial port     |   CN3    | 32-bit VESA local  |  SL1 &   |
   |                 |          | bus slots          |   SL2    |
   |-----------------+----------+--------------------+----------|
   | PS/2 mouse port |   CN4    |                    |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Label |  Position  |
   |---------------------------------------+-------+------------|
   |>> | Flash BIOS normal operation       |  J14  |    Open    |
   |---+-----------------------------------+-------+------------|
   |   | Flash BIOS recovery mode          |  J14  |   Closed   |
   |---+-----------------------------------+-------+------------|
   |>> | Monitor type select monochrome    |  J15  |    Open    |
   |---+-----------------------------------+-------+------------|
   |   | Monitor type select color         |  J15  |   Closed   |
   |---+-----------------------------------+-------+------------|
   |>> | Factory configured - do not alter |  J16  |    Open    |
   |---+-----------------------------------+-------+------------|
   |>> | VLRDY >CPURDY connects to CPU bus |  J28  | Pins 1 & 2 |
   |   | ready                             |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | VLRDY >LRDY synchronized through  |  J28  | Pins 2 & 3 |
   |   | chipset                           |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |>> | Reset switch enabled              |  J33  |   Closed   |
   |---+-----------------------------------+-------+------------|
   |   | Reset switch disabled             |  J33  |    Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       4MB        |   (2) 256K x 36    |   (2) 256K x 36    |
   |------------------+--------------------+--------------------|
   |       4MB        |   (2) 512K x 36    |        None        |
   |------------------+--------------------+--------------------|
   |       8MB        |    (2) 1M x 36     |        None        |
   |------------------+--------------------+--------------------|
   |       16MB       |    (2) 2M x 36     |        None        |
   |------------------+--------------------+--------------------|
   |       16MB       |    (2) 1M x 36     |    (2) 1M x 36     |
   |------------------+--------------------+--------------------|
   |       24MB       |    (2) 2M x 36     |    (2) 1M x 36     |
   |------------------+--------------------+--------------------|
   |       32MB       |    (2) 4M x 36     |        None        |
   |------------------+--------------------+--------------------|
   |       32MB       |    (2) 2M x 36     |    (2) 2M x 36     |
   |------------------+--------------------+--------------------|
   |       40MB       |    (2) 4M x 36     |    (2) 1M x 36     |
   |------------------+--------------------+--------------------|
   |       48MB       |    (2) 4M x 36     |    (2) 2M x 36     |
   |------------------+--------------------+--------------------|
   |       64MB       |    (2) 4M x 36     |    (2) 4M x 36     |
   |------------------------------------------------------------|
   | Note: The location of banks 0 & 1 are unidentified.        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |    Bank 0     |    Bank 1     |      TAG      |
   |------------+---------------+---------------+---------------|
   |   128KB    |  (4) 32K x 8  |     None      |  (3) 16K x 4  |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (3) 16K x 4  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |     J35     |    J36     |    J37     |    J38     |
   |-------+-------------+------------+------------+------------|
   | None  |    Open     |    Open    |    Open    |    Open    |
   |-------+-------------+------------+------------+------------|
   | 128KB | Pins 1 & 2  | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
   |       |   closed    |   closed   |   closed   |   closed   |
   |-------+-------------+------------+------------+------------|
   | 256KB | Pins 2 & 3  | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
   |       |   closed    |   closed   |   closed   |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CPU SPEED SELECTION                     |
   |------------------------------------------------------------|
   |     Speed     |     J24      |     J25      |     J26      |
   |---------------+--------------+--------------+--------------|
   |     25MHz     |    Closed    |    Closed    |     Open     |
   |---------------+--------------+--------------+--------------|
   |     33MHz     |    Closed    |     Open     |    Closed    |
   |---------------+--------------+--------------+--------------|
   |     40MHz     |     Open     |     Open     |    Closed    |
   |---------------+--------------+--------------+--------------|
   |    50iMHz     |    Closed    |    Closed    |     Open     |
   |---------------+--------------+--------------+--------------|
   |     50MHz     |     Open     |     Open     |     Open     |
   |---------------+--------------+--------------+--------------|
   |    66iMHz     |    Closed    |     Open     |    Closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                VL BUS WAIT STATE SELECTION                 |
   |------------------------------------------------------------|
   |          Setting           |              J27              |
   |----------------------------+-------------------------------|
   |>>  |           0           |       Pins 1 & 2 closed       |
   |----+-----------------------+-------------------------------|
   |    |           1           |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+