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       # SOYO COMPUTER CO., LTD.
       
          PENTIUM (P54C) PCI MAINBOARD
       
          Processor         Pentium                                      
          Processor Speed   90/100MHz                                    
          Chip Set          Unidentified                                 
          Max. Onboard DRAM 512MB                                        
          Cache             256/512KB                                    
          BIOS              Award                                        
          Dimensions        330mm x 218mm                                
          I/O Options       32-bit PCI bus slots (4), green PC connector 
          NPU Options       None                                         
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose       | Location | Purpose              | Location |
          |---------------+----------+----------------------+----------|
          | Power LED &   |   J17    | Green PC connector   |   J21    |
          | keylock       |          |                      |          |
          |---------------+----------+----------------------+----------|
          | Speaker       |   J18    | Green PC LED         |   J22    |
          |---------------+----------+----------------------+----------|
          | Reset switch  |   J19    | 32-bit PCI bus slots |  SL1 -   |
          |               |          |                      |   SL4    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function                | Jumper  | Position |
          |---------------------------------------+---------+----------|
          | » | Ppeline address disabled          |   J24   |   Open   |
          |---+-----------------------------------+---------+----------|
          |   | Pipeline address enabled          |   J24   |  Closed  |
          |---+-----------------------------------+---------+----------|
          | » | Cache type select write back      |   J29   |   Open   |
          |---+-----------------------------------+---------+----------|
          |   | Cache type select write through   |   J29   |  Closed  |
          |---+-----------------------------------+---------+----------|
          | » | Monitor type select color         |   JP3   |  Closed  |
          |---+-----------------------------------+---------+----------|
          |   | Monitor type select monochrome    |   JP3   |   Open   |
          |---+-----------------------------------+---------+----------|
          | » | CMOS memory normal operation      |   JP5   |   Open   |
          |---+-----------------------------------+---------+----------|
          |   | CMOS memory clear                 |   JP5   |  Closed  |
          |---+-----------------------------------+---------+----------|
          | » | Factory configured - do not alter |  JP36   |  Closed  |
          |---+-----------------------------------+---------+----------|
          | » | Factory configured - do not alter |  JP37   |  Closed  |
          |---+-----------------------------------+---------+----------|
          | » | Factory configured - do not alter |  JP38   |  Closed  |
          |---+-----------------------------------+---------+----------|
          | » | Factory configured - do not alter |  JP39   |   Open   |
          |---+-----------------------------------+---------+----------|
          | » | Factory configured - do not alter |  JP40   |   Open   |
          |---+-----------------------------------+---------+----------|
          | » | Factory configured - do not alter |  JP41   |   Open   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |       Bank 1       |
          |------------------+--------------------+--------------------|
          |       2MB        |   (2) 256K x 36    |        NONE        |
          |------------------+--------------------+--------------------|
          |       4MB        |   (2) 256K x 36    |   (2) 256K x 36    |
          |------------------+--------------------+--------------------|
          |       4MB        |   (2) 512K x 36    |        NONE        |
          |------------------+--------------------+--------------------|
          |       8MB        |   (2) 512K x 36    |   (2) 512K x 36    |
          |------------------+--------------------+--------------------|
          |       8MB        |    (2) 1M x 36     |        NONE        |
          |------------------+--------------------+--------------------|
          |       10MB       |   (2) 256K x 36    |    (2) 1M x 36     |
          |------------------+--------------------+--------------------|
          |       12MB       |   (2) 512K x 36    |    (2) 1M x 36     |
          |------------------+--------------------+--------------------|
          |       16MB       |    (2) 2M x 36     |        NONE        |
          |------------------+--------------------+--------------------|
          |       16MB       |    (2) 1M x 36     |    (2) 1M x 36     |
          |------------------+--------------------+--------------------|
          |       20MB       |   (2) 512K x 36    |    (2) 2M x 36     |
          |------------------+--------------------+--------------------|
          |       24MB       |    (2) 1M x 36     |    (2) 2M x 36     |
          |------------------+--------------------+--------------------|
          |       32MB       |    (2) 4M x 36     |        NONE        |
          |------------------+--------------------+--------------------|
          |       32MB       |    (2) 2M x 36     |    (2) 2M x 36     |
          |------------------+--------------------+--------------------|
          |       48MB       |    (2) 2M x 36     |    (2) 4M x 36     |
          |------------------+--------------------+--------------------|
          |       64MB       |    (2) 8M x 36     |        NONE        |
          |------------------+--------------------+--------------------|
          |       64MB       |    (2) 4M x 36     |    (2) 4M x 36     |
          |------------------+--------------------+--------------------|
          |       68MB       |   (2) 512K x 36    |    (2) 8M x 36     |
          |------------------+--------------------+--------------------|
          |       80MB       |    (2) 2M x 36     |    (2) 8M x 36     |
          |------------------+--------------------+--------------------|
          |       96MB       |    (2) 4M x 36     |    (2) 8M x 36     |
          |------------------+--------------------+--------------------|
          |      128MB       |    (2) 8M x 36     |    (2) 8M x 36     |
          |------------------+--------------------+--------------------|
          |      128MB       |    (2) 16M x 36    |        NONE        |
          |------------------+--------------------+--------------------|
          |      256MB       |    (2) 16M x 36    |    (2) 16M x 36    |
          |------------------+--------------------+--------------------|
          |      256MB       |    (2) 32M x 36    |        NONE        |
          |------------------+--------------------+--------------------|
          |      512MB       |    (2) 32M x 36    |    (2) 32M x 36    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |       Bank 1       |
          |------------------+--------------------+--------------------|
          |      256KB       |    (4) 32K x 8     |    (4) 32K x 8     |
          |------------------+--------------------+--------------------|
          |      512KB       |    (4) 64K x 8     |    (4) 64K x 8     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          |       Size       |        J25         |        J26         |
          |------------------+--------------------+--------------------|
          |      256KB       | pins 2 & 3 closed  | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |      512KB       | pins 2 & 3 closed  | pins 2 & 3 closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  CPU SPEED CONFIGURATION                   |
          |------------------------------------------------------------|
          |     Speed     |     JP31     |     JP34     |     JP35     |
          |---------------+--------------+--------------+--------------|
          |     90MHz     |    Closed    |     Open     |     Open     |
          |---------------+--------------+--------------+--------------|
          |    100MHz     |     Open     |    Closed    |    Closed    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               PCI IRQ CONFIGURATION (IRQ 10)               |
          |------------------------------------------------------------|
          |       PIRQ       |        J44         |        J51         |
          |------------------+--------------------+--------------------|
          |      PIRQ 0      |        Open        | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |      PIRQ 1      |        Open        | pins 2 & 3 closed  |
          |------------------+--------------------+--------------------|
          |      PIRQ 2      | pins 1 & 2 closed  |        Open        |
          |------------------+--------------------+--------------------|
          |      PIRQ 3      | pins 2 & 3 closed  |        Open        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               PCI IRQ CONFIGURATION (IRQ 11)               |
          |------------------------------------------------------------|
          |       PIRQ       |        J45         |        J52         |
          |------------------+--------------------+--------------------|
          |      PIRQ 0      |        Open        | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |      PIRQ 1      |        Open        | pins 2 & 3 closed  |
          |------------------+--------------------+--------------------|
          |      PIRQ 2      | pins 1 & 2 closed  |        Open        |
          |------------------+--------------------+--------------------|
          |      PIRQ 3      | pins 2 & 3 closed  |        Open        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               PCI IRQ CONFIGURATION (IRQ 12)               |
          |------------------------------------------------------------|
          |       PIRQ       |        J46         |        J53         |
          |------------------+--------------------+--------------------|
          |      PIRQ 0      |        Open        | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |      PIRQ 1      |        Open        | pins 2 & 3 closed  |
          |------------------+--------------------+--------------------|
          |      PIRQ 2      | pins 1 & 2 closed  |        Open        |
          |------------------+--------------------+--------------------|
          |      PIRQ 3      | pins 2 & 3 closed  |        Open        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               PCI IRQ CONFIGURATION (IRQ 14)               |
          |------------------------------------------------------------|
          |       PIRQ       |        J47         |        J54         |
          |------------------+--------------------+--------------------|
          |      PIRQ 0      |        Open        | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |      PIRQ 1      |        Open        | pins 2 & 3 closed  |
          |------------------+--------------------+--------------------|
          |      PIRQ 2      | pins 1 & 2 closed  |        Open        |
          |------------------+--------------------+--------------------|
          |      PIRQ 3      | pins 2 & 3 closed  |        Open        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               PCI IRQ CONFIGURATION (IRQ 15)               |
          |------------------------------------------------------------|
          |       PIRQ       |        J48         |        J55         |
          |------------------+--------------------+--------------------|
          |      PIRQ 0      |        Open        | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |      PIRQ 1      |        Open        | pins 2 & 3 closed  |
          |------------------+--------------------+--------------------|
          |      PIRQ 2      | pins 1 & 2 closed  |        Open        |
          |------------------+--------------------+--------------------|
          |      PIRQ 3      | pins 2 & 3 closed  |        Open        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |              HOST BUS PREQUENCY CONFIGURATION              |
          |------------------------------------------------------------|
          |          Setting           |              J30              |
          |----------------------------+-------------------------------|
          |         Full speed         |             Open              |
          |----------------------------+-------------------------------|
          |         2/3 speed          |       pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |         1/2 speed          |       pins 2 & 3 closed       |
          +------------------------------------------------------------+