DASH COMPUTER, INC.
===================

   486WB WRITEBACK-CACHE SYSTEM BOARD

   Processor             80486SX/80486DX                          
   Processor Speed       33/50MHz                                 
   Chip Set              OPTI                                     
   Max. Onboard DRAM     32MB                                     
   Cache                 64/256KB                                 
   BIOS                  AMI                                      
   Dimensions            330mm x 220mm                            
   I/O Options           32-bit external memory card slot         
   NPU Options           4167                                     

<gopher://bitreich.org/I/th99/m/C-D/31175-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | External battery  |   J11    | 32-bit external  |    S1    |
   |                   |          | memory card      |          |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   J23    | Reset switch     |   SW1    |
   | keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Speaker           |   J24    | Turbo switch     |   SW2    |
   |-------------------+----------+------------------+----------|
   | Turbo LED         |   JP11   |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | CMOS memory normal operation     |  JP1   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | CMOS memory clear                |  JP1   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Monitor type select color        |  JP2   |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select monochrome   |  JP2   |    open    |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP7   |    open    |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | CPU speed select OSC/2           |  JP8   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | CPU speed select OSC/1           |  JP8   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |      Size      |       Bank 0        |       Bank 1        |
   |----------------+---------------------+---------------------|
   |      1MB       |    (4) 256K x 9     |        NONE         |
   |----------------+---------------------+---------------------|
   |      2MB       |    (4) 256K x 9     |    (4) 256K x 9     |
   |----------------+---------------------+---------------------|
   |      4MB       |     (4) 1M x 9      |        NONE         |
   |----------------+---------------------+---------------------|
   |      5MB       |    (4) 256K x 9     |     (4) 1M x 9      |
   |----------------+---------------------+---------------------|
   |      8MB       |     (4) 1M x 9      |     (4) 1M x 9      |
   |----------------+---------------------+---------------------|
   |      16MB      |     (4) 4M x 9      |        NONE         |
   |----------------+---------------------+---------------------|
   |      20MB      |     (4) 1M x 9      |     (4) 4M x 9      |
   |----------------+---------------------+---------------------|
   |      32MB      |     (4) 4M x 9      |     (4) 4M x 9      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU JUMPER CONFIGURATION                  |
   |------------------------------------------------------------|
   |   CPU   |        JP3        |   JP4    |        JP5        |
   |---------+-------------------+----------+-------------------|
   | 80486DX | pins 2 & 3 closed |  closed  | pins 1 & 2 closed |
   |---------+-------------------+----------+-------------------|
   | 80486SX |       open        |   open   | pins 2 & 3 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |  Size   |        JP6        |  JP9   |   JP10   |   JP12   |
   |---------+-------------------+--------+----------+----------|
   |  64KB   | pins 2 & 3 closed |  open  |   open   |   open   |
   |---------+-------------------+--------+----------+----------|
   |  128KB  | pins 1 & 2 closed |  open  |  closed  |  closed  |
   |---------+-------------------+--------+----------+----------|
   |  256KB  | pins 2 & 3 closed |  open  |  closed  |  closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |     Cache     |   Location    |      TAG      |
   |------------+---------------+---------------+---------------|
   |    64KB    |  (8) 8K x 8   |  Banks 0 & 1  |     NONE      |
   |------------+---------------+---------------+---------------|
   |   128KB    |  (4) 32K x 8  |    Banks 0    |  (1) 8K x 8   |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (8) 32K x 8  |  Banks 0 & 1  |  (1) 8K x 8   |
   +------------------------------------------------------------+