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       # SHUTTLE COMPUTER INTERNATIONAL, INC.
       
          HOT-419
       
       Processor  CX486S/80486SX/SL80486SX/UMC U5-S/CX486DX/AM486DX/80486DX/         
                  SL80486DX/CX486DX2/AM486DX2/80486DX2/SL80486DX2/P24D/              
                                                                                     
                  AM486DX4/SL80486DX4/Pentium Overdrive                              
       Processor  20/25/33/40/50(internal)/66(internal/75(internal)/100(internal)MHz 
       Speed      
       Chip Set   OPTI                                                               
       Max.       128MB                                                              
       Onboard    
       DRAM       
       Cache      64/128/256/512KB                                                   
       BIOS       AMI                                                                
       Dimensions 260mm x 220mm                                                      
       I/O        32-bit VESA local bus slots (3)                                    
       Options    
       NPU        NONE                                                               
       Options    
       
   IMG IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose       | Location | Purpose              | Location |
          |---------------+----------+----------------------+----------|
          | Reset switch  |   CN1    | External battery     |    J1    |
          |---------------+----------+----------------------+----------|
          | Turbo switch  |   CN2    | Green PC connector   |   JP63   |
          |---------------+----------+----------------------+----------|
          | Speaker       |   CN3    | EPMI connector       |   JP68   |
          |---------------+----------+----------------------+----------|
          | Power LED &   |   CN4    | 32-bit VESA local    |  SL1 -   |
          | keylock       |          | bus slots            |   SL3    |
          |---------------+----------+----------------------+----------|
          | Turbo LED     |   CN5    |                      |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function               | Jumper |  Position  |
          |--------------------------------------+--------+------------|
          | »  | Monitor type select color       |  JP30  |   Closed   |
          |----+---------------------------------+--------+------------|
          |    | Monitor type select monochrome  |  JP30  |    Open    |
          |----+---------------------------------+--------+------------|
          | »  | ADS signal delay disabled       |  JP36  | pins 2 & 3 |
          |    |                                 |        |   closed   |
          |----+---------------------------------+--------+------------|
          |    | ADS signal delay enabled        |  JP36  | pins 1 & 2 |
          |    |                                 |        |   closed   |
          |----+---------------------------------+--------+------------|
          | »  | Factory configured - do not     |  JP53  |    N/A     |
          |    | alter                           |        |            |
          |----+---------------------------------+--------+------------|
          | »  | P24T CPU cache type select      |  JP58  |   Closed   |
          |    | write back                      |        |            |
          |----+---------------------------------+--------+------------|
          |    | P24T CPU cache type select      |  JP58  |    Open    |
          |    | write through                   |        |            |
          |----+---------------------------------+--------+------------|
          | »  | P24D CPU cache type select      |  JP59  |   Closed   |
          |    | write back                      |        |            |
          |----+---------------------------------+--------+------------|
          |    | P24D CPU cache type select      |  JP59  |    Open    |
          |    | write through                   |        |            |
          |----+---------------------------------+--------+------------|
          | »  | Factory configured - do not     |  JP67  |    N/A     |
          |    | alter                           |        |            |
          |----+---------------------------------+--------+------------|
          | »  | Factory configured - do not     |  JP74  |    N/A     |
          |    | alter                           |        |            |
          |----+---------------------------------+--------+------------|
          | »  | Factory configured - do not     |  JP77  |    N/A     |
          |    | alter                           |        |            |
          |----+---------------------------------+--------+------------|
          | »  | Factory configured - do not     |  JP79  |    N/A     |
          |    | alter                           |        |            |
          |------------------------------------------------------------|
          | Note: The location of JP53 JP58 and JP67 is unidentified.  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    DRAM CONFIGURATION 1                    |
          |------------------------------------------------------------|
          | Size  |   Bank 0    |   Bank 1   |   Bank 2   |   Bank 3   |
          |-------+-------------+------------+------------+------------|
          |  1MB  | (1) 256K x  |    NONE    |    NONE    |    NONE    |
          |       |     36      |            |            |            |
          |-------+-------------+------------+------------+------------|
          |  2MB  | (1) 256K x  | (1) 256K x |    NONE    |    NONE    |
          |       |     36      |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          |  4MB  | (1) 1M x 36 |    NONE    |    NONE    |    NONE    |
          |-------+-------------+------------+------------+------------|
          |  4MB  | (1) 256K x  | (1) 256K x | (1) 256K x | (1) 256K x |
          |       |     36      |     36     |     36     |     36     |
          |-------+-------------+------------+------------+------------|
          |  5MB  | (1) 256K x  |  (1) 1M x  |    NONE    |    NONE    |
          |       |     36      |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          |  6MB  | (1) 256K x  | (1) 256K x |  (1) 1M x  |    NONE    |
          |       |     36      |     36     |     36     |            |
          |-------+-------------+------------+------------+------------|
          |  8MB  | (1) 1M x 36 |  (1) 1M x  |    NONE    |    NONE    |
          |       |             |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          |  8MB  | (1) 1M x 36 |    NONE    |  (1) 1M x  |    NONE    |
          |       |             |            |     36     |            |
          |-------+-------------+------------+------------+------------|
          | 10MB  | (1) 256K x  | (1) 256K x |  (1) 1M x  |  (1) 1M x  |
          |       |     36      |     36     |     36     |     36     |
          |-------+-------------+------------+------------+------------|
          | 12MB  | (1) 1M x 36 |    NONE    |  (1) 1M x  |  (1) 1M x  |
          |       |             |            |     36     |     36     |
          |-------+-------------+------------+------------+------------|
          | 16MB  | (1) 4M x 36 |    NONE    |    NONE    |    NONE    |
          |-------+-------------+------------+------------+------------|
          | 16MB  | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |  (1) 1M x  |
          |       |             |     36     |     36     |     36     |
          |-------+-------------+------------+------------+------------|
          | 17MB  | (1) 256K x  |  (1) 4M x  |    NONE    |    NONE    |
          |       |     36      |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          | 20MB  | (1) 1M x 36 |  (1) 4M x  |    NONE    |    NONE    |
          |       |             |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          | 20MB  | (1) 1M x 36 |    NONE    |  (1) 4M x  |    NONE    |
          |       |             |            |     36     |            |
          |-------+-------------+------------+------------+------------|
          | 32MB  | (1) 4M x 36 |  (1) 4M x  |    NONE    |    NONE    |
          |       |             |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          | 32MB  | (1) 4M x 36 |    NONE    |  (1) 4M x  |    NONE    |
          |       |             |            |     36     |            |
          |-------+-------------+------------+------------+------------|
          | 64MB  | (1) 4M x 36 |  (1) 4M x  |  (1) 4M x  |  (1) 4M x  |
          |       |             |     36     |     36     |     36     |
          |-------+-------------+------------+------------+------------|
          | 64MB  |  (1) 16M x  |    NONE    |    NONE    |    NONE    |
          |       |     36      |            |            |            |
          |-------+-------------+------------+------------+------------|
          | 128MB |  (1) 16M x  | (1) 16M x  |    NONE    |    NONE    |
          |       |     36      |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          | 128MB |  (1) 16M x  |    NONE    | (1) 16M x  |    NONE    |
          |       |     36      |            |     36     |            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    DRAM CONFIGURATION 2                    |
          |------------------------------------------------------------|
          |  Size  |    Bank 0     |    Bank 1     | Bank 2  | Bank 3  |
          |--------+---------------+---------------+---------+---------|
          |  1MB   | (1) 256K x 36 |     NONE      |  NONE   |  NONE   |
          |--------+---------------+---------------+---------+---------|
          |  2MB   | (1) 512K x 36 |     NONE      |  NONE   |  NONE   |
          |--------+---------------+---------------+---------+---------|
          |  4MB   | (1) 512K x 36 | (1) 512K x 36 |  NONE   |  NONE   |
          |--------+---------------+---------------+---------+---------|
          |  4MB   |  (1) 1M x 36  |     NONE      |  NONE   |  NONE   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                DRAM CONFIGURATION 2 (CON’T)                |
          |------------------------------------------------------------|
          | Size  |    Bank 0    |    Bank 1    |   Bank 2    | Bank 3 |
          |-------+--------------+--------------+-------------+--------|
          |  6MB  |  (1) 512K x  | (1) 1M x 36  |    NONE     |  NONE  |
          |       |      36      |              |             |        |
          |-------+--------------+--------------+-------------+--------|
          |  6MB  |  (1) 512K x  |  (1) 512K x  | (1) 512K x  |  NONE  |
          |       |      36      |      36      |     36      |        |
          |-------+--------------+--------------+-------------+--------|
          |  8MB  | (1) 2M x 36  |     NONE     |    NONE     |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          |  8MB  | (1) 1M x 36  | (1) 1M x 36  |    NONE     |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 12MB  | (1) 1M x 36  | (1) 2M x 36  |    NONE     |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 12MB  |  (1) 512K x  |  (1) 512K x  | (1) 2M x 36 |  NONE  |
          |       |      36      |      36      |             |        |
          |-------+--------------+--------------+-------------+--------|
          | 16MB  | (1) 2M x 36  | (1) 2M x 36  |    NONE     |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 16MB  | (1) 1M x 36  | (1) 1M x 36  | (1) 2M x 36 |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 20MB  | (1) 1M x 36  | (1) 4M x 36  |    NONE     |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 20MB  | (1) 1M x 36  | (1) 2M x 36  | (1) 2M x 36 |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 24MB  | (1) 1M x 36  | (1) 1M x 36  | (1) 4M x 36 |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 24MB  | (1) 2M x 36  | (1) 2M x 36  | (1) 2M x 36 |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 32MB  | (1) 8M x 36  |     NONE     |    NONE     |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 32MB  | (1) 4M x 36  | (1) 4M x 36  |    NONE     |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 32MB  | (1) 2M x 36  | (1) 2M x 36  | (1) 4M x 36 |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 40MB  | (1) 1M x 36  | (1) 1M x 36  | (1) 8M x 36 |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 48MB  | (1) 4M x 36  | (1) 4M x 36  | (1) 4M x 36 |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 48MB  | (1) 2M x 36  | (1) 2M x 36  | (1) 8M x 36 |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 64MB  | (1) 4M x 36  | (1) 4M x 36  | (1) 8M x 36 |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 64MB  | (1) 16M x 36 |     NONE     |    NONE     |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 64MB  | (1) 8M x 36  | (1) 8M x 36  |    NONE     |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 96MB  | (1) 8M x 36  | (1) 8M x 36  | (1) 8M x 36 |  NONE  |
          |-------+--------------+--------------+-------------+--------|
          | 128MB | (1) 16M x 36 | (1) 16M x 36 |    NONE     |  NONE  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 DRAM JUMPER CONFIGURATION                  |
          |------------------------------------------------------------|
          | Type |  JP60  |  JP61  |  JP62  |  JP70  |  JP71  |  JP72  |
          |------+--------+--------+--------+--------+--------+--------|
          |  1   | Closed | Closed | Closed | pins 1 | pins 1 | pins 1 |
          |      |        |        |        |  & 2   |  & 2   |  & 2   |
          |      |        |        |        | closed | closed | closed |
          |------+--------+--------+--------+--------+--------+--------|
          |  2   |  Open  |  Open  |  Open  | pins 2 | pins 2 | pins 2 |
          |      |        |        |        |  & 3   |  & 3   |  & 3   |
          |      |        |        |        | closed | closed | closed |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    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) 32K x 8  |
          |------------+---------------+---------------+---------------|
          |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (1) 32K x 8  |
          |------------+---------------+---------------+---------------|
          |   512KB    | (4) 128K x 8  |     NONE      |  (1) 32K x 8  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          | Size  | JP5  |  JP10  |  JP11  |       JP13       |  JP50  |
          |-------+------+--------+--------+------------------+--------|
          | 64KB  | Open |  Open  |  Open  |    Pins 2 & 3    |  Open  |
          |       |      |        |        |      closed      |        |
          |-------+------+--------+--------+------------------+--------|
          | 128KB | Open |  Open  | Closed |    Pins 1 & 2    |  Open  |
          |       |      |        |        |      closed      |        |
          |-------+------+--------+--------+------------------+--------|
          | 256KB | Open | Closed | Closed |    Pins 2 & 3    |  Open  |
          |       |      |        |        |      closed      |        |
          |-------+------+--------+--------+------------------+--------|
          | 512KB | Open | Closed | Closed |    Pins 1 & 2    | Closed |
          |       |      |        |        |      closed      |        |
          |------------------------------------------------------------|
          | Note: JP5 may not be present on all revisions.             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |    Type    |          JPA           |         JPB          |
          |------------+------------------------+----------------------|
          |   CX486S   | 6 & 7, 8 & 9, 10 & 11, |         Open         |
          |            |        12 & 13         |                      |
          |------------+------------------------+----------------------|
          |  80486SX   | 6 & 7, 8 & 9, 10 & 11, | 3 & 4, 5 & 6, 7 & 8, |
          |            |        12 & 13         |        9 & 10        |
          |------------+------------------------+----------------------|
          | SL80486SX  | 6 & 7, 8 & 9, 10 & 11, | 3 & 4, 5 & 6, 7 & 8, |
          |            |        12 & 13         |        9 & 10        |
          |------------+------------------------+----------------------|
          |  UMC U5-S  | 6 & 7, 8 & 9, 10 & 11, | 3 & 4, 5 & 6, 7 & 8, |
          |            |        12 & 13         |        9 & 10        |
          |------------+------------------------+----------------------|
          |  CX486DX   | 5 & 6, 7 & 8, 9 & 10,  |         Open         |
          |            |        11 & 12         |                      |
          |------------+------------------------+----------------------|
          |  AM486DX   | 5 & 6, 7 & 8, 9 & 10,  | 1 & 2, 3 & 4, 5 & 6, |
          |            |        11 & 12         |        7 & 8         |
          |------------+------------------------+----------------------|
          |  80486DX   | 5 & 6, 7 & 8, 9 & 10,  | 3 & 4, 5 & 6, 7 & 8, |
          |            |        11 & 12         |        9 & 10        |
          |------------+------------------------+----------------------|
          | SL80486DX  | 5 & 6, 7 & 8, 9 & 10,  | 3 & 4, 5 & 6, 7 & 8, |
          |            |        11 & 12         |        9 & 10        |
          |------------+------------------------+----------------------|
          |  CX486DX2  | 5 & 6, 7 & 8, 9 & 10,  |         Open         |
          |            |        11 & 12         |                      |
          |------------+------------------------+----------------------|
          |  AM468DX2  | 5 & 6, 7 & 8, 9 & 10,  | 1 & 2, 3 & 4, 5 & 6, |
          |            |        11 & 12         |        7 & 8         |
          |------------+------------------------+----------------------|
          |  80486DX2  | 5 & 6, 7 & 8, 9 & 10,  | 3 & 4, 5 & 6, 7 & 8, |
          |            |        11 & 12         |        9 & 10        |
          |------------+------------------------+----------------------|
          | SL80486DX2 | 5 & 6, 7 & 8, 9 & 10,  | 3 & 4, 5 & 6, 7 & 8, |
          |            |        11 & 12         |        9 & 10        |
          |------------+------------------------+----------------------|
          |    P24D    | 1 & 2, 3 & 4, 5 & 6, 7 | 3 & 4, 5 & 6, 7 & 8, |
          |            |          & 8           |        9 & 10        |
          |------------+------------------------+----------------------|
          |  AM486DX4  | 5 & 6, 7 & 8, 9 & 10,  | 1 & 2, 3 & 4, 5 & 6, |
          |            |        11 & 12         |        7 & 8         |
          |------------+------------------------+----------------------|
          | SL80486DX4 | 5 & 6, 7 & 8, 9 & 10,  | 3 & 4, 5 & 6, 7 & 8, |
          |            |        11 & 12         |        9 & 10        |
          |------------+------------------------+----------------------|
          |    P24T    | 3 & 4, 5 &6, 7 & 8, 9  | 3 & 4, 5 & 6, 7 & 8, |
          |            |          & 10          |        9 & 10        |
          |------------------------------------------------------------|
          | Note: Pins designated should be in closed position.        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               CPU TYPE CONFIGURATION (CON’T)               |
          |------------------------------------------------------------|
          |    Type    |        JPC         |  JP44  |  JP45  |  JP46  |
          |------------+--------------------+--------+--------+--------|
          |   CX486S   | 1 & 2, 3 & 4, 5 &  |  Open  |  Open  |  Open  |
          |            |      6, 7 & 8      |        |        |        |
          |------------+--------------------+--------+--------+--------|
          |  80486SX   |        Open        |  Open  |  Open  |  Open  |
          |------------+--------------------+--------+--------+--------|
          | SL80486SX  |        Open        | Closed | Closed | Closed |
          |------------+--------------------+--------+--------+--------|
          |  UMC U5-S  |        Open        |  Open  |  Open  |  Open  |
          |------------+--------------------+--------+--------+--------|
          |  CX486DX   | 1 & 2, 3 & 4, 5 &  |  Open  |  Open  |  Open  |
          |            |      6, 7 & 8      |        |        |        |
          |------------+--------------------+--------+--------+--------|
          |  AM486DX   |        Open        |  Open  |  Open  |  Open  |
          |------------+--------------------+--------+--------+--------|
          |  80486DX   |        Open        |  Open  |  Open  |  Open  |
          |------------+--------------------+--------+--------+--------|
          | SL80486DX  |        Open        | Closed | Closed | Closed |
          |------------+--------------------+--------+--------+--------|
          |  CX486DX2  | 1 & 2, 3 & 4, 5 &  |  Open  |  Open  |  Open  |
          |            |      6, 7 & 8      |        |        |        |
          |------------+--------------------+--------+--------+--------|
          |  AM468DX2  |        Open        |  Open  |  Open  |  Open  |
          |------------+--------------------+--------+--------+--------|
          |  80486DX2  |        Open        |  Open  |  Open  |  Open  |
          |------------+--------------------+--------+--------+--------|
          | SL80486DX2 |        Open        | Closed | Closed | Closed |
          |------------+--------------------+--------+--------+--------|
          |    P24D    |        Open        | Closed | Closed | Closed |
          |------------+--------------------+--------+--------+--------|
          |  AM486DX4  |        Open        |  Open  |  Open  |  Open  |
          |------------+--------------------+--------+--------+--------|
          | SL80486DX4 |        Open        | Closed | Closed | Closed |
          |------------+--------------------+--------+--------+--------|
          |    P24T    |        Open        | Closed | Closed | Closed |
          |------------------------------------------------------------|
          | Note: Pins designated should be in closed position.        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               CPU TYPE CONFIGURATION (CON’T)               |
          |------------------------------------------------------------|
          |      Type      |     JP47      |     JP48     |    JP65    |
          |----------------+---------------+--------------+------------|
          |     CX486S     |    Closed     |    Closed    |    Open    |
          |----------------+---------------+--------------+------------|
          |    80486SX     |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |   SL80486SX    |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |    UMC U5-S    |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |    CX486DX     |    Closed     |    Closed    |    Open    |
          |----------------+---------------+--------------+------------|
          |    AM486DX     |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |    80486DX     |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |   SL80486DX    |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |    CX486DX2    |    Closed     |    Closed    |    Open    |
          |----------------+---------------+--------------+------------|
          |    AM468DX2    |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |    80486DX2    |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |   SL80486DX2   |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |      P24D      |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |    AM486DX4    |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |   SL80486DX4   |     Open      |     Open     |    Open    |
          |----------------+---------------+--------------+------------|
          |      P24T      |     Open      |     Open     |    Open    |
          |------------------------------------------------------------|
          | Note: Pins designated should be in closed position.        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  CPU SPEED CONFIGURATION                   |
          |------------------------------------------------------------|
          |  Speed  |      JP21      |      JP22      |      JP23      |
          |---------+----------------+----------------+----------------|
          |  20MHz  |   pins 2 & 3   |   pins 2 & 3   |   pins 1 & 2   |
          |         |     closed     |     closed     |     closed     |
          |---------+----------------+----------------+----------------|
          |  25MHz  |   pins 2 & 3   |   pins 1 & 2   |   pins 2 & 3   |
          |         |     closed     |     closed     |     closed     |
          |---------+----------------+----------------+----------------|
          |  33MHz  |   pins 1 & 2   |   pins 2 & 3   |   pins 2 & 3   |
          |         |     closed     |     closed     |     closed     |
          |---------+----------------+----------------+----------------|
          |  40MHz  |   pins 2 & 3   |   pins 1 & 2   |   pins 1 & 2   |
          |         |     closed     |     closed     |     closed     |
          |---------+----------------+----------------+----------------|
          | 50iMHz  |   pins 2 & 3   |   pins 1 & 2   |   pins 2 & 3   |
          |         |     closed     |     closed     |     closed     |
          |---------+----------------+----------------+----------------|
          |  50MHz  |   pins 1 & 2   |   pins 2 & 3   |   pins 1 & 2   |
          |         |     closed     |     closed     |     closed     |
          |---------+----------------+----------------+----------------|
          | 66iMHz  |   pins 1 & 2   |   pins 2 & 3   |   pins 2 & 3   |
          |         |     closed     |     closed     |     closed     |
          |---------+----------------+----------------+----------------|
          | 75iMHz  |   pins 2 & 3   |      Open      |   pins 2 & 3   |
          |         |     closed     |                |     closed     |
          |---------+----------------+----------------+----------------|
          | 100iMHz |      Open      |   pins 2 & 3   |   pins 2 & 3   |
          |         |                |     closed     |     closed     |
          |---------+----------------+----------------+----------------|
          | 100iMHz |      Open      |   pins 2 & 3   |      Open      |
          |         |                |     closed     |                |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |          CPU SPEED CONFIGURATION (80486DX4 ONLY)           |
          |------------------------------------------------------------|
          |           Speed            |             JP65              |
          |----------------------------+-------------------------------|
          |             2x             |       pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |             3x             |       pins 2 & 3 closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CPU VOLTAGE CONFIGURATION                  |
          |------------------------------------------------------------|
          | CPU Voltage |           JP64           |       JP73        |
          |-------------+--------------------------+-------------------|
          |    3.33v    | pins 3 & 5, 4 & 6 closed | pins 1 & 2 closed |
          |-------------+--------------------------+-------------------|
          |    3.45v    | pins 3 & 5, 4 & 6 closed |       Open        |
          |-------------+--------------------------+-------------------|
          |    4.0v     | pins 3 & 5, 4 & 6 closed | pins 2 & 3 closed |
          |-------------+--------------------------+-------------------|
          |    5.0v     | pins 1 & 3, 2 & 4 closed |       Open        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               CPU SIGNAL DELAY CONFIGURATION               |
          |------------------------------------------------------------|
          |    CPU Delay     |           JP55           |     JP69     |
          |------------------+--------------------------+--------------|
          |     Delay 1      | pins 1 & 2, 3 & 4 closed |     Open     |
          |------------------+--------------------------+--------------|
          |     Delay 2      |    pins 2 & 3 closed     |    Closed    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               VESA WAIT STATE CONFIGURATION                |
          |------------------------------------------------------------|
          |          Wait states          |            JP33            |
          |-------------------------------+----------------------------|
          |         0 wait states         |            Open            |
          |-------------------------------+----------------------------|
          |         1 wait state          |           Closed           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BUS SPEED CONFIGURATION                   |
          |------------------------------------------------------------|
          |           CPU speed           |            JP34            |
          |-------------------------------+----------------------------|
          |           <= 33MHz            |            Open            |
          |-------------------------------+----------------------------|
          |            > 33MHz            |           Closed           |
          +------------------------------------------------------------+