(TXT) View Source
       
       # AUSTIN COMPUTER SYSTEMS
       
          486U
       
          Processor        80486SX/80487SX/80486DX/80486DX2              
          Processor Speed  20/25/33/50(internal)/50/66(internal)MHz      
          Chip Set         OPTI                                          
          Max. Onboard     32MB                                          
          DRAM             
          Cache            64/256KB                                      
          BIOS             Mylex                                         
          Dimensions       330mm x 218mm                                 
          I/O Options      Floppy drive interface, IDE interface,        
                           parallel port, serial ports (2)               
          NPU Options      4167                                          
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose           | Location | Purpose          | Location |
          |-------------------+----------+------------------+----------|
          | Parallel port     |    J1    | Turbo LED        |   JP3    |
          |-------------------+----------+------------------+----------|
          | Serial port COM 2 |    J2    | Reset switch     |   JP4    |
          |-------------------+----------+------------------+----------|
          | Serial port COM 1 |    J3    | Speaker          |   JP5    |
          |-------------------+----------+------------------+----------|
          | Floppy controller |    J4    | IDE interface    |   JP6    |
          |                   |          | LED              |          |
          |-------------------+----------+------------------+----------|
          | IDE interface     |    J5    | External battery |   JP22   |
          |-------------------+----------+------------------+----------|
          | Power LED &       |   JP2    |                  |          |
          | keylock           |          |                  |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function              | Jumper |   Position   |
          |------------------------------------+--------+--------------|
          | » | Monitor type select monochrome |  JP1   |     open     |
          |---+--------------------------------+--------+--------------|
          |   | Monitor type select color      |  JP1   |    closed    |
          |---+--------------------------------+--------+--------------|
          | » | Parallel port IRQ select IRQ7  |  JP19  |  pins 2 & 3  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          |   | Parallel port IRQ select IRQ5  |  JP19  |  pins 1 & 2  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          | » | CMOS memory normal operation   |  JP21  |  pins 2 & 3  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          |   | CMOS memory clear              |  JP21  |  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) 1M x 9     |    (4) 256K x 9    |
          |------------------+--------------------+--------------------|
          |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
          |------------------+--------------------+--------------------|
          |       16MB       |     (4) 4M x 9     |        NONE        |
          |------------------+--------------------+--------------------|
          |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |    Size    |    Bank 0     |   TAG (U1)    |   TAG (U2)    |
          |------------+---------------+---------------+---------------|
          |    64KB    |  (8) 8K x 8   |  (1) 64K x 1  |  (1) 8K x 8   |
          |------------+---------------+---------------+---------------|
          |   256KB    |  (8) 32K x 8  |  (1) 64K x 1  |  (1) 32K x 8  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          |   Size    |    JP7     |    JP11    |   JP12   |   JP13    |
          |-----------+------------+------------+----------+-----------|
          |   64KB    |    Open    |    Open    |   Open   |   Open    |
          |-----------+------------+------------+----------+-----------|
          |   256KB   |   Closed   |   Closed   |   Open   |  Closed   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |   Type    |        JP8        |        JP9        |  JP10  |
          |-----------+-------------------+-------------------+--------|
          |  80486SX  |       Open        | pins 2 & 3 closed |  Open  |
          |-----------+-------------------+-------------------+--------|
          |  80487SX  | pins 2 & 3 closed | pins 1 & 2 closed | Closed |
          |-----------+-------------------+-------------------+--------|
          |  80486DX  | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
          |-----------+-------------------+-------------------+--------|
          | 80486DX2  | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  CPU SPEED CONFIGURATION                   |
          |------------------------------------------------------------|
          |  Speed   |   JP14   |  JP15   |  JP16   |  JP17  |  JP18   |
          |----------+----------+---------+---------+--------+---------|
          |  20MHz   |  2 & 3   |  1 & 2  |  2 & 3  | 1 & 2  |  Open   |
          |----------+----------+---------+---------+--------+---------|
          |  25MHz   |  2 & 3   |  2 & 3  |  1 & 2  | 2 & 3  |  Open   |
          |----------+----------+---------+---------+--------+---------|
          |  33MHz   |  2 & 3   |  1 & 2  |  1 & 2  | 2 & 3  |  Open   |
          |----------+----------+---------+---------+--------+---------|
          |  50MHz   |  1 & 2   |  2 & 3  |  1 & 2  | 2 & 3  | Closed  |
          |----------+----------+---------+---------+--------+---------|
          |  50iMHz  |  2 & 3   |  2 & 3  |  1 & 2  | 2 & 3  |  Open   |
          |----------+----------+---------+---------+--------+---------|
          |  66iMHz  |  2 & 3   |  1 & 2  |  1 & 2  | 2 & 3  |  Open   |
          |------------------------------------------------------------|
          | Note: Pins designated should be in the closed position.    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 ON BOARD I/O CONFIGURATION                 |
          |------------------------------------------------------------|
          |                Setting                 |       JP20        |
          |----------------------------------------+-------------------|
          | Serial port 1, serial port 2, parallel | pins 1 & 2 closed |
          |  port, floppy drive interface enabled  |                   |
          |----------------------------------------+-------------------|
          | Serial port 1, serial port 2, parallel | pins 2 & 3 closed |
          | port, floppy drive interface disabled  |                   |
          +------------------------------------------------------------+