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

   DECPC 400MT

   Processor        80486DX/80486DX2                              
   Processor Speed  33/50(internal)/66(internal)MHz               
   Chip Set         Unidentified                                  
   Video Chip Set   Unidentified                                  
   Maximum Onboard  64MB                                          
   Memory           
   Maximum Video    1MB                                           
   Memory           
   Cache            None                                          
   BIOS             Unidentified                                  
   Dimensions       254mm x 218mm                                 
   I/O Options      CPU slot, parallel port, PS/2 mouse port,     
                    serial ports (2), VGA port                    
   NPU Options      None                                          

<gopher://bitreich.org/I/th99/m/C-D/34052-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose         | Location | Purpose            | Location |
   |-----------------+----------+--------------------+----------|
   | Parallel port   |   CN1    | PS/2 mouse port    |   CN5    |
   |-----------------+----------+--------------------+----------|
   | VGA port        |   CN2    | External battery   |   JP1    |
   |-----------------+----------+--------------------+----------|
   | Serial port 2   |   CN3    | CPU slot           |   SL1    |
   |-----------------+----------+--------------------+----------|
   | Serial port 1   |   CN4    |                    |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function               | Label |   Position   |
   |-------------------------------------+-------+--------------|
   |>> | VGA IRQ9 disabled               |  J13  |     Open     |
   |---+---------------------------------+-------+--------------|
   |   | VGA IRQ9 enabled                |  J13  |    Closed    |
   |---+---------------------------------+-------+--------------|
   |>> | On board video enabled          |  J14  |    Closed    |
   |---+---------------------------------+-------+--------------|
   |   | On board video disabled         |  J14  |     Open     |
   |---+---------------------------------+-------+--------------|
   |>> | Local enabled                   |  J23  |  Pins 1 & 2  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | Local & ISA enabled             |  J23  |  Pins 2 & 3  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |>> | Parallel port unidirectional    |  J25  |  Pins 1 & 2  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | Parallel port bidirectional     |  J25  |  Pins 2 & 3  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |>> | Reset switch enabled            |  J27  |  Pins 1 & 2  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | Reset switch disabled           |  J27  |  Pins 2 & 3  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  J28  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |   | Monitor type select color       |  J29  |    Closed    |
   |---+---------------------------------+-------+--------------|
   |   | Monitor type select monochrome  |  J29  |     Open     |
   |---+---------------------------------+-------+--------------|
   |>> | CMOS memory normal operation    |  J31  |  Pins 1 & 2  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | CMOS memory clear               |  J31  |  Pins 2 & 3  |
   |   |                                 |       |    closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (1) 1M x 36 |    None     |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (1) 1M x 36 | (1) 1M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 12MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 4M x 36 |    None     |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 20MB | (1) 1M x 36 | (1) 4M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 24MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 4M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 32MB | (1) 4M x 36 | (1) 4M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 40MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 4M x  |  (1) 4M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 48MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 64MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |  (1) 4M x  |
   |      |             |             |     36     |     36     |
   |------------------------------------------------------------|
   | Note: The location of banks 0, 1, 2 & 3 are unidentified.  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 VIDEO MEMORY CONFIGURATION                 |
   |------------------------------------------------------------|
   |        Size        |      Bank 0       |      Bank 1       |
   |--------------------+-------------------+-------------------|
   |       512KB        |       512KB       |       None        |
   |--------------------+-------------------+-------------------|
   |        1MB         |       512KB       |       512KB       |
   |------------------------------------------------------------|
   | Note: The location of banks 0 & 1 are unidentified.        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             VIDEO MEMORY JUMPER CONFIGURATION              |
   |------------------------------------------------------------|
   |            Size            |              J22              |
   |----------------------------+-------------------------------|
   |           512KB            |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |            1MB             |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+