BEC COMPUTER ENTERPRISE
=======================

   80486AT (Ver. 1.0)

   Processor           80486DX                                    
   Processor Speed     25/33MHz                                   
   Chip Set            None                                       
   Max. Onboard DRAM   16MB                                       
   SRAM Cache          64/256KB                                   
   BIOS                AMI                                        
   Dimensions          355mm x 304mm                              
   I/O Options         None                                       
   NPU Options         4167                                       

<gopher://bitreich.org/I/th99/m/A-B/31305-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose        | Location | Purpose             | Location |
   |----------------+----------+---------------------+----------|
   | Reset switch   |    W1    | Power LED & keylock |    W5    |
   |----------------+----------+---------------------+----------|
   | Turbo switch   |    W3    | Speaker             |   W10    |
   |----------------+----------+---------------------+----------|
   | Turbo LED      |    W4    | External battery    |   W11    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 1MB  | (4) 256K x  |    NONE     |    NONE    |    NONE    |
   |      |      9      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 2MB  | (4) 256K x  | (4) 256K x  |    NONE    |    NONE    |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 3MB  | (4) 256K x  | (4) 256K x  | (4) 256K x |    NONE    |
   |      |      9      |      9      |     9      |            |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (4) 256K x  | (4) 256K x  | (4) 256K x | (4) 256K x |
   |      |      9      |      9      |     9      |     9      |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (4) 1M x 9  |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 5MB  | (4) 256K x  | (4) 1M x 9  |    NONE    |    NONE    |
   |      |      9      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 6MB  | (4) 256K x  | (4) 256K x  | (4) 1M x 9 |    NONE    |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 7MB  | (4) 256K x  | (4) 256K x  | (4) 256K x | (4) 1M x 9 |
   |      |      9      |      9      |     9      |            |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (4) 1M x 9  | (4) 1M x 9  |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 9MB  | (4) 256K x  | (4) 1M x 9  | (4) 1M x 9 |    NONE    |
   |      |      9      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 10MB | (4) 256K x  | (4) 256K x  | (4) 1M x 9 | (4) 1M x 9 |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 12MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 13MB | (4) 256K x  | (4) 1M x 9  | (4) 1M x 9 | (4) 1M x 9 |
   |      |      9      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 16MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 | (4) 1M x 9 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               CPU SWITCH (SW2) CONFIGURATION               |
   |------------------------------------------------------------|
   | Size | SW2/switch 1 | SW2/switch | SW2/switch | SW2/switch |
   |      |              |     2      |     3      |     4      |
   |------+--------------+------------+------------+------------|
   | 1MB  |     open     |    open    |    open    |    open    |
   |------+--------------+------------+------------+------------|
   | 2MB  |    closed    |    open    |    open    |    open    |
   |------+--------------+------------+------------+------------|
   | 3MB  |     open     |   closed   |    open    |    open    |
   |------+--------------+------------+------------+------------|
   | 4MB  |    closed    |   closed   |    open    |    open    |
   |------+--------------+------------+------------+------------|
   | 4MB  |     open     |    open    |   closed   |    open    |
   |------+--------------+------------+------------+------------|
   | 5MB  |     open     |    open    |   closed   |   closed   |
   |------+--------------+------------+------------+------------|
   | 6MB  |     open     |   closed   |    open    |   closed   |
   |------+--------------+------------+------------+------------|
   | 7MB  |    closed    |    open    |    open    |   closed   |
   |------+--------------+------------+------------+------------|
   | 8MB  |    closed    |    open    |   closed   |    open    |
   |------+--------------+------------+------------+------------|
   | 9MB  |     open     |   closed   |   closed   |   closed   |
   |------+--------------+------------+------------+------------|
   | 10MB |    closed    |   closed   |    open    |   closed   |
   |------+--------------+------------+------------+------------|
   | 12MB |     open     |   closed   |   closed   |    open    |
   |------+--------------+------------+------------+------------|
   | 13MB |    closed    |   closed   |   closed   |   closed   |
   |------+--------------+------------+------------+------------|
   | 16MB |    closed    |   closed   |   closed   |    open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 SRAM JUMPER CONFIGURATION                  |
   |------------------------------------------------------------|
   | Size  |    Jumper W6    |    Jumper W8    |   Jumper W9    |
   |-------+-----------------+-----------------+----------------|
   | 64KB  |   pins 1 & 2    |   pins 1 & 2    |   pins 1 & 2   |
   |       |     closed      |     closed      |     closed     |
   |-------+-----------------+-----------------+----------------|
   | 256KB |   pins 1 & 2    |   pins 2 & 3    |   pins 2 & 3   |
   |       |     closed      |     closed      |     closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     SRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |        TAG         |
   |------------------+--------------------+--------------------|
   |       64KB       |     (8) 8K x 8     |    (2) 16K x 4     |
   |------------------+--------------------+--------------------|
   |      256KB       |    (8) 32K x 8     |    (2) 16K x 4     |
   +------------------------------------------------------------+