ADVANCED COMPUTER TECHNOLOGY, LTD.
==================================

   T386-25

   Processor             80386DX                                  
   Processor Speed       25MHz                                    
   Chip Set              ACT                                      
   Max. Onboard DRAM     16MB                                     
   Cache                 None                                     
   BIOS                  AMI                                      
   Dimensions            330mm x 218mm                            
   I/O Options           None                                     
   NPU Options           80387/3167                               

<gopher://bitreich.org/I/th99/m/A-B/30276-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | Turbo LED         |   JP3    | External battery |   JP13   |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   JP7    | Speaker          |   JP16   |
   | Keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Reset switch      |   JP12   | Turbo switch     |   JP17   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |           Function            | Jumper/Switch |  Position  |
   |-------------------------------+---------------+------------|
   |>> | BIOS type select 27512    |      JP6      | pins 1 & 2 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | BIOS type select 27256    |      JP6      | pins 2 & 3 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Monitor type select color |      JP8      | pins 2 & 3 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | Monitor type select       |      JP8      | pins 1 & 2 |
   |   | monochrome                |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Battery select internal   |     JP14      | pins 2 & 3 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | Battery select external   |     JP14      | pins 1 & 2 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Power good signal detect  |     JP15      | pins 1 & 2 |
   |   | from power supply         |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | Power good signal detect  |     JP15      | pins 2 & 3 |
   |   | from board                |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Refresh timing select     |     JP18      | pins 1 & 2 |
   |   | normal                    |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | Refresh timing select     |     JP18      | pins 2 & 3 |
   |   | fast                      |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Parity check enabled      |     JP19      | pins 1 & 2 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | Parity check disabled     |     JP19      | pins 2 & 3 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Page mode select normal   |     JP20      | pins 1 & 2 |
   |   | 1, 2 wait state           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | Page mode select page     |     JP20      | pins 2 & 3 |
   |   | interleave                |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | SIMM wait state select 2  |     JP21      | pins 2 & 3 |
   |   | wait states (non-page     |               |   closed   |
   |   | mode)                     |               |            |
   |---+---------------------------+---------------+------------|
   |   | SIMM wait state select 1  |     JP21      | pins 1 & 2 |
   |   | wait state (non-page      |               |   closed   |
   |   | mode)                     |               |            |
   |---+---------------------------+---------------+------------|
   |>> | DIP RAM wait state select |     JP22      | pins 2 & 3 |
   |   | 2 wait states (non-page   |               |   closed   |
   |   | mode)                     |               |            |
   |---+---------------------------+---------------+------------|
   |   | DIP RAM wait state select |     JP22      | pins 1 & 2 |
   |   | 1 wait state (non-page    |               |   closed   |
   |   | mode)                     |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Interleave factor banks   |     SW1/3     |    Off     |
   |   | 0-3 four way interleave   |               |            |
   |   | disabled                  |               |            |
   |---+---------------------------+---------------+------------|
   |   | Interleave factor banks   |     SW1/3     |     On     |
   |   | 0-3 four way interleave   |               |            |
   |   | enabled                   |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Interleave factor banks 2 |     SW1/4     |    Off     |
   |   | and 3 interleave disabled |               |            |
   |---+---------------------------+---------------+------------|
   |   | Interleave factor banks 2 |     SW1/4     |     On     |
   |   | and 3 two way interleave  |               |            |
   |   | enabled                   |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Interleave factor banks 0 |     SW1/5     |    Off     |
   |   | and 1 interleave disabled |               |            |
   |---+---------------------------+---------------+------------|
   |   | Interleave factor banks 0 |     SW1/5     |     On     |
   |   | and 1 two way interleave  |               |            |
   |   | enabled                   |               |            |
   |------------------------------------------------------------|
   | Note:SW1/switch 5 should be open if 1MB is installed, if   |
   | memory is greater it should be closed.                     |
   |                                                            |
   | SW1/switch 4 should be closed if 10MB is installed.        |
   |                                                            |
   | SW1/switch 3 should be closed if 4MB is installed.         |
   |                                                            |
   | JP20 pins 1 & 2 must be closed if 4M x 9 SIMMs are used.   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |  P-0   |  P-1   |
   |------+--------+--------+--------+--------+--------+--------|
   | 1MB  |  (8)   |  NONE  |  NONE  |  NONE  |  (4)   |  NONE  |
   |      | 44256  |        |        |        | 41256  |        |
   |------+--------+--------+--------+--------+--------+--------|
   | 2MB  |  (8)   |  (8)   |  NONE  |  NONE  |  (4)   |  (4)   |
   |      | 44256  | 44256  |        |        | 41256  | 41256  |
   |------+--------+--------+--------+--------+--------+--------|
   | 3MB  |  (8)   |  (8)   |  (4)   |  NONE  |  (4)   |  (4)   |
   |      | 44256  | 44256  | 256K x |        | 41256  | 41256  |
   |      |        |        |   9    |        |        |        |
   |------+--------+--------+--------+--------+--------+--------|
   | 4MB  |  (8)   |  (8)   |  (4)   |  (4)   |  (4)   |  (4)   |
   |      | 44256  | 44256  | 256K x | 256K x | 41256  | 41256  |
   |      |        |        |   9    |   9    |        |        |
   |------+--------+--------+--------+--------+--------+--------|
   | 6MB  |  (8)   |  (8)   | (4) 1M |  NONE  |  (4)   |  (4)   |
   |      | 44256  | 44256  |  x 9   |        | 41256  | 41256  |
   |------+--------+--------+--------+--------+--------+--------|
   | 10MB |  (8)   |  (8)   | (4) 1M | (4) 1M |  (4)   |  (4)   |
   |      | 44256  | 44256  |  x 9   |  x 9   | 41256  | 41256  |
   |------+--------+--------+--------+--------+--------+--------|
   | 16MB |  NONE  |  NONE  | (4) 4M | (4) 4M |  NONE  |  NONE  |
   |      |        |        |  x 9   |  x 9   |        |        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              DRAM JUMPER/SWITCH CONFIGURATION              |
   |------------------------------------------------------------|
   |  Size   |  SW1/6   |  SW1/7  |  SW1/8  |       JP23        |
   |---------+----------+---------+---------+-------------------|
   |   1MB   |   Off    |   Off   |   Off   | pins 2 & 3 closed |
   |---------+----------+---------+---------+-------------------|
   |   2MB   |   Off    |   Off   |   On    | pins 2 & 3 closed |
   |---------+----------+---------+---------+-------------------|
   |   3MB   |   Off    |   On    |   Off   | pins 2 & 3 closed |
   |---------+----------+---------+---------+-------------------|
   |   4MB   |   Off    |   On    |   On    | pins 2 & 3 closed |
   |---------+----------+---------+---------+-------------------|
   |   6MB   |    On    |   On    |   Off   | pins 2 & 3 closed |
   |---------+----------+---------+---------+-------------------|
   |  10MB   |    On    |   On    |   On    | pins 2 & 3 closed |
   |---------+----------+---------+---------+-------------------|
   |  16MB   |   Off    |   Off   |   Off   | pins 1 & 2 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              DRAM REFRESH RATE CONFIGURATION               |
   |------------------------------------------------------------|
   |               Size                |   SW1/1    |   SW1/2   |
   |-----------------------------------+------------+-----------|
   | Refreshes per hold cycle select 1 |    Off     |    Off    |
   |-----------------------------------+------------+-----------|
   | Refreshes per hold cycle select 2 |    Off     |    On     |
   |-----------------------------------+------------+-----------|
   | Refreshes per hold cycle select 4 |     On     |    Off    |
   |-----------------------------------+------------+-----------|
   | Refreshes per hold cycle select 8 |     On     |    On     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   NPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |       Type       |        JP2         |        JP4         |
   |------------------+--------------------+--------------------|
   |      80387       | pins 1 & 2 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |       3167       | pins 2 & 3 closed  | pins 1 & 2 closed  |
   +------------------------------------------------------------+