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       # ABIT COMPUTER CORPORATION
       
          PK5 (REV. 1.1)
       
          Processor         Pentium                                      
          Processor Speed   90/100/120/133MHz                            
          Chip Set          OPTI                                         
          Max. Onboard DRAM 128MB                                        
          Cache             256/512/1024KB                               
          BIOS              Award                                        
          Dimensions        254mm x 218mm                                
          I/O Options       32-bit PCI slots (3), green PC connector     
          NPU Options       None                                         
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose            | Location | Purpose         | Location |
          |--------------------+----------+-----------------+----------|
          | Green PC connector |   JP14   | Reset switch    |   JW4    |
          |--------------------+----------+-----------------+----------|
          | Power LED &        |   JW1    | Turbo LED       |   JW5    |
          | keylock            |          |                 |          |
          |--------------------+----------+-----------------+----------|
          | Speaker            |   JW2    | 32-bit PCI      |  PC1 -   |
          |                    |          | slots           |   PC3    |
          |--------------------+----------+-----------------+----------|
          | Turbo switch       |   JW3    |                 |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function                | Jumper  | Position |
          |---------------------------------------+---------+----------|
          | » | CMOS memory normal operation      |   JP5   |   Open   |
          |---+-----------------------------------+---------+----------|
          |   | CMOS memory clear                 |   JP5   |  Closed  |
          |---+-----------------------------------+---------+----------|
          | » | Monitor type select color         |  JP18   |  Closed  |
          |---+-----------------------------------+---------+----------|
          |   | Monitor type select monochrome    |  JP18   |   Open   |
          |---+-----------------------------------+---------+----------|
          | » | Factory configured - do not alter |  JP28   |   N/A    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |       Bank 1       |
          |------------------+--------------------+--------------------|
          |       2MB        |   (2) 256K x 36    |        NONE        |
          |------------------+--------------------+--------------------|
          |       4MB        |   (2) 512K x 36    |        NONE        |
          |------------------+--------------------+--------------------|
          |       4MB        |   (2) 256K x 36    |   (2) 256K x 36    |
          |------------------+--------------------+--------------------|
          |       6MB        |   (2) 256K x 36    |   (2) 512K x 36    |
          |------------------+--------------------+--------------------|
          |       8MB        |    (2) 1M x 36     |        NONE        |
          |------------------+--------------------+--------------------|
          |       8MB        |   (2) 512K x 36    |   (2) 512K x 36    |
          |------------------+--------------------+--------------------|
          |       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     |
          |------------------+--------------------+--------------------|
          |       18MB       |   (2) 256K x 36    |    (2) 2M 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     |
          |------------------+--------------------+--------------------|
          |       34MB       |   (2) 256K x 36    |    (2) 4M x 36     |
          |------------------+--------------------+--------------------|
          |       36MB       |   (2) 512K x 36    |    (2) 4M x 36     |
          |------------------+--------------------+--------------------|
          |       40MB       |    (2) 1M x 36     |    (2) 4M 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     |
          |------------------+--------------------+--------------------|
          |       66MB       |   (2) 256K x 36    |    (2) 8M x 36     |
          |------------------+--------------------+--------------------|
          |       68MB       |   (2) 512K x 36    |    (2) 8M x 36     |
          |------------------+--------------------+--------------------|
          |       72MB       |    (2) 1M 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     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          |              Type               |           JP4            |
          |---------------------------------+--------------------------|
          |   Bank 0 = single side SIMM &   | pins 1 & 2, 3 & 4 closed |
          |        Bank 1 = any SIMM        |                          |
          |---------------------------------+--------------------------|
          |   Bank 0 = double side SIMM &   | pins 2 & 3, 4 & 5 closed |
          |        Bank 1 = any SIMM        |                          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |        TAG         |
          |------------------+--------------------+--------------------|
          |      256KB       |    (8) 32K x 8     |     (1) 8K x 8     |
          |------------------+--------------------+--------------------|
          |      512KB       |    (8) 64K x 8     |    (1) 32K x 8     |
          |------------------+--------------------+--------------------|
          |       1MB        |    (8) 128K x 8    |    (1) 32K x 8     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          |            Size            |             JP11              |
          |----------------------------+-------------------------------|
          |           256KB            |   pins 2 & 3, 5 & 6 closed    |
          |----------------------------+-------------------------------|
          |           512KB            |   pins 1 & 2, 5 & 6 closed    |
          |----------------------------+-------------------------------|
          |            1MB             |   pins 1 & 2, 4 & 5 closed    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  CPU SPEED CONFIGURATION                   |
          |------------------------------------------------------------|
          |   Speed    |    JP7    |    JP8    |    JP9    |   JP27    |
          |------------+-----------+-----------+-----------+-----------|
          |   75MHz    |  Closed   |   Open    |   Open    |   Open    |
          |------------+-----------+-----------+-----------+-----------|
          |   90MHz    |   Open    |  Closed   |   Open    |   Open    |
          |------------+-----------+-----------+-----------+-----------|
          |   100MHz   |  Closed   |   Open    |  Closed   |   Open    |
          |------------+-----------+-----------+-----------+-----------|
          |   120MHz   |   Open    |  Closed   |   Open    |  Closed   |
          |------------+-----------+-----------+-----------+-----------|
          |   133MHz   |  Closed   |   Open    |  Closed   |  Closed   |
          +------------------------------------------------------------+