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

   DC 386 WB WRITE BACK-CACHE

   Processor             80386DX                                  
   Processor Speed       25/33/40MHz                              
   Chip Set              OPTI                                     
   Max. Onboard DRAM     32MB                                     
   Cache                 32/64/128/256KB                          
   BIOS                  AMI                                      
   Dimensions            330mm x 218mm                            
   I/O Options           32-bit external memory card slot         
   NPU Options           80387                                    

<gopher://bitreich.org/I/th99/m/C-D/31169-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose               | Location | Purpose      | Location |
   |-----------------------+----------+--------------+----------|
   | Power LED & keylock   |   J23    | Reset switch |   SW1    |
   |-----------------------+----------+--------------+----------|
   | Speaker               |   J24    | Turbo switch |   SW2    |
   |-----------------------+----------+--------------+----------|
   | 32-bit external       |    S1    | Turbo LED    |   SW3    |
   | memeory card          |          |              |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Jumper |   Position   |
   |------------------------------------+--------+--------------|
   |>> | Monitor type select monochrome |  JP1   |     open     |
   |---+--------------------------------+--------+--------------|
   |   | Monitor type select color      |  JP1   |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | CMOS memory normal operation   |  JP2   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | CMOS memory clear              |  JP2   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | Bus speed select ATCLK/6       |  JP3   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | Bus speed select ATCLK/8       |  JP3   |     open     |
   |------------------------------------------------------------|
   | Note:Pins 3 and 4 on JP3 are not used                      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |  JP5   |  JP6   |  JP7   |  JP8   |  JP9   | JP10  |
   |-------+--------+--------+--------+--------+--------+-------|
   | 32KB  | pins 1 | pins 1 | pins 1 |  open  | pins 2 | pins  |
   |       |  & 2   |  & 2   |  & 2   |        |  & 3   | 2 & 3 |
   |-------+--------+--------+--------+--------+--------+-------|
   | 64KB  | pins 2 | pins 1 | pins 1 |  open  | pins 2 | pins  |
   |       |  & 3   |  & 2   |  & 2   |        |  & 3   | 1 & 2 |
   |-------+--------+--------+--------+--------+--------+-------|
   | 128KB | pins 2 | pins 1 | pins 2 | closed | pins 2 | pins  |
   |       |  & 3   |  & 2   |  & 3   |        |  & 3   | 1 & 2 |
   |-------+--------+--------+--------+--------+--------+-------|
   | 256KB | pins 2 | pins 2 | pins 2 | closed | pins 1 | pins  |
   |       |  & 3   |  & 3   |  & 3   |        |  & 2   | 1 & 2 |
   |------------------------------------------------------------|
   | Note:Pins designated should be in the closed position      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  | Cache SRAM  | Location  | TAG (U32 &  | Dirty Bit  |
   |       |             |           |    U33)     |   (U42)    |
   |-------+-------------+-----------+-------------+------------|
   | 32KB  | (4) 8K x 8  |  Bank 0   | (2) 4K x 4  | (1) 4K x 4 |
   |-------+-------------+-----------+-------------+------------|
   | 64KB  | (8) 8K x 8  | Banks 0 & | (2) 4K x 4  | (1) 4K x 4 |
   |       |             |     1     |             |            |
   |-------+-------------+-----------+-------------+------------|
   | 128KB | (4) 32K x 8 |  Bank 0   | (2) 16K x 4 | (1) 16K x  |
   |       |             |           |             |     1      |
   |-------+-------------+-----------+-------------+------------|
   | 256KB | (8) 32K x 8 | Banks 0 & | (2) 16K x 4 | (1) 16K x  |
   |       |             |     1     |             |     1      |
   +------------------------------------------------------------+