(TXT) View Source
       
       # GIGA-BYTE TECHNOLOGY CO., LTD.
       
          GA-486US
       
          Processor             80486SX/80486DX                          
          Processor Speed       16/20/25/33/50MHz                        
          Chip Set              UMC                                      
          Max. Onboard DRAM     32MB                                     
          SRAM Cache            64/128/256KB                             
          BIOS                  AMI                                      
          Dimensions            330mm x 218mm                            
          I/O Options           32-bit local bus card slots (2)          
          NPU Options           4167                                     
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose       | Location | Purpose              | Location |
          |---------------+----------+----------------------+----------|
          | Power LED &   |    J1    | External battery     |   J17    |
          | Keylock       |          |                      |          |
          |---------------+----------+----------------------+----------|
          | Reset switch  |    J2    | 32-bit local bus     |  LB1 &   |
          |               |          | slots                |   LB2    |
          |---------------+----------+----------------------+----------|
          | Speaker       |    J3    |                      |   LB2    |
          |---------------+----------+----------------------+----------|
          | Turbo LED     |    J5    |                      |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function               | Jumper  |  Position  |
          |-------------------------------------+---------+------------|
          | »  | External cache enabled         |   J4    | pins 1 & 2 |
          |    |                                |         |   closed   |
          |----+--------------------------------+---------+------------|
          |    | External cache disabled        |   J4    | pins 2 & 3 |
          |    |                                |         |   closed   |
          |----+--------------------------------+---------+------------|
          |    | CPU type select 80486DX        |   J8    | pins 1 & 2 |
          |    |                                |         |   closed   |
          |----+--------------------------------+---------+------------|
          |    | CPU type select 80486SX        |   J8    | pins 2 & 3 |
          |    |                                |         |   closed   |
          |----+--------------------------------+---------+------------|
          | »  | CPU speed select iOSC/1        |   J13   |    Open    |
          |----+--------------------------------+---------+------------|
          |    | CPU speed select iOSC/2        |   J13   |   Closed   |
          |----+--------------------------------+---------+------------|
          | »  | Monitor type select color      |   J16   |   Closed   |
          |----+--------------------------------+---------+------------|
          |    | Monitor type select monochrome |   J16   |    Open    |
          |----+--------------------------------+---------+------------|
          | »  | CMOS memory normal operation   |   J18   |   Closed   |
          |----+--------------------------------+---------+------------|
          |    | CMOS memory clear              |   J18   |    Open    |
          |------------------------------------------------------------|
          | Note:If J13 is closed, you must set the Bus speed select   |
          | to CLKIN/5 in the advanced chipset setup.                  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     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   |  (3) 16K x 4  |
          |------------+---------------+---------------+---------------|
          |   128KB    |  (4) 32K x 8  |     NONE      |  (3) 16K x 4  |
          |------------+---------------+---------------+---------------|
          |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (3) 16K x 4  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          | Size  |       J10       |       J11       |      J12       |
          |-------+-----------------+-----------------+----------------|
          | 64KB  |   pins 1 & 2    |   pins 1 & 2    |   pins 1 & 2   |
          |       |     closed      |     closed      |     closed     |
          |-------+-----------------+-----------------+----------------|
          | 128KB |   pins 1 & 2    |   pins 2 & 3    |   pins 1 & 2   |
          |       |     closed      |     closed      |     closed     |
          |-------+-----------------+-----------------+----------------|
          | 256KB |   pins 2 & 3    |   pins 2 & 3    |   pins 2 & 3   |
          |       |     closed      |     closed      |     closed     |
          +------------------------------------------------------------+