(TXT) View Source
       
       # GIGA-BYTE TECHNOLOGY, INC.
       
          GA-486UM
       
          Processor          80486SX/80487SX/80486DX/ODP486SX/80486DX2   
          Processor Speed    16/20/25/33/50(internal)/50/66(internal)MHz 
          Chip Set           OPTI                                        
          Max. Onboard DRAM  32MB                                        
          Cache              64/128/256KB                                
          BIOS               AMI                                         
          Dimensions         220mm x 240mm                               
          I/O Options        None                                        
          NPU Options        None                                        
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose             | Location | Purpose        | Location |
          |---------------------+----------+----------------+----------|
          | External battery    |    J3    | Turbo switch   |   J10    |
          |---------------------+----------+----------------+----------|
          | Speaker             |    J8    | Turbo LED      |   J11    |
          |---------------------+----------+----------------+----------|
          | Power LED & keylock |    J9    | Reset          |   J12    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function              | Jumper |   Position   |
          |------------------------------------+--------+--------------|
          | » | Monitor type select color      |   J6   |    Closed    |
          |---+--------------------------------+--------+--------------|
          |   | Monitor type select monochrome |   J6   |     Open     |
          |---+--------------------------------+--------+--------------|
          | » | CMOS memory normal operation   |  J13   |  pins 1 & 2  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          |   | CMOS memory clear              |  J13   |  pins 2 & 3  |
          |   |                                |        |    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        |
          |------------------+--------------------+--------------------|
          |       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     |    Bank 1     |      TAG      |
          |------------+---------------+---------------+---------------|
          |    64KB    |  (4) 8K x 8   |  (4) 8K x 8   |  (1) 8K x 8   |
          |------------+---------------+---------------+---------------|
          |   128KB    |  (4) 32K x 8  |     NONE      |  (1) 8K x 8   |
          |------------+---------------+---------------+---------------|
          |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (1) 32K x 8  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          | Size  |       W1        |       W2       |   W7   |   W9   |
          |-------+-----------------+----------------+--------+--------|
          | 64KB  |   pins 1 & 2    |      Open      |  Open  |  Open  |
          |       |     closed      |                |        |        |
          |-------+-----------------+----------------+--------+--------|
          | 128KB |   pins 2 & 3    |   pins 1 & 2   |  Open  | Closed |
          |       |     closed      |     closed     |        |        |
          |-------+-----------------+----------------+--------+--------|
          | 256KB |   pins 1 & 2    |   pins 2 & 3   | Closed | Closed |
          |       |     closed      |     closed     |        |        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |     Type      |  OSC Speed  |   W10    |        W11        |
          |---------------+-------------+----------+-------------------|
          |  80486SX-16   |    16MHz    |   Open   | pins 2 & 3 closed |
          |---------------+-------------+----------+-------------------|
          |  80486SX-20   |    20MHz    |   Open   | pins 2 & 3 closed |
          |---------------+-------------+----------+-------------------|
          |  80486SX-20   |    40MHz    |  Closed  | pins 2 & 3 closed |
          |---------------+-------------+----------+-------------------|
          |  80486SX-25   |    25MHz    |   Open   | pins 2 & 3 closed |
          |---------------+-------------+----------+-------------------|
          |  80487SX-25   |    25MHz    |   Open   | pins 1 & 2 closed |
          |---------------+-------------+----------+-------------------|
          |  80486DX-25   |    25MHz    |   Open   | pins 1 & 2 closed |
          |---------------+-------------+----------+-------------------|
          |  80486DX-33   |    33MHz    |   Open   | pins 1 & 2 closed |
          |---------------+-------------+----------+-------------------|
          |  80486DX-50   |    50MHz    |   Open   | pins 1 & 2 closed |
          |---------------+-------------+----------+-------------------|
          |  80486DX2-50  |    25MHz    |   Open   | pins 1 & 2 closed |
          |---------------+-------------+----------+-------------------|
          |  80486DX2-66  |    33MHz    |   Open   | pins 1 & 2 closed |
          +------------------------------------------------------------+