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       # DATAEXPERT CORPORATION
       
          AIO4045
       
          Device Type     Mainboard                                      
          Processor       80486SX/CX M6/80486DX/SL80486DX/CX             
                          M7/80486DX2/                                   
                                                                         
                          SL80486DX2/P24D/P24T                           
          Processor Speed 20/25/33/40/50(internal)/66(internal)MHz       
          Chip Set        Unidentified                                   
          Video Chip Set  Avance Logic                                   
          Maximum Onboard 128MB                                          
          Memory          
          Maximum Video   Unidentified                                   
          Memory          
          Cache           128/256/512KB                                  
          BIOS            Award                                          
          Dimensions      330mm x 218mm                                  
          I/O Options     Ethernet 10Base5 connector, floppy drive       
                          interface, green PC connector, IDE interface,  
                          parallel port, serial ports (2), VGA port,     
                          riser slot                                     
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose               | Location | Purpose      | Location |
          |-----------------------+----------+--------------+----------|
          | VGA port              |   CN1    | Power LED &  |    J1    |
          |                       |          | keylock      |          |
          |-----------------------+----------+--------------+----------|
          | Parallel port         |   CN2    | Speaker      |    J2    |
          |-----------------------+----------+--------------+----------|
          | Serial port 1         |   CN3    | Turbo switch |    J3    |
          |-----------------------+----------+--------------+----------|
          | Serial port 2         |   CN4    | Turbo LED    |    J4    |
          |-----------------------+----------+--------------+----------|
          | Ethernet 10Base5      |   CN5    | Reset switch |    J5    |
          | connector             |          |              |          |
          |-----------------------+----------+--------------+----------|
          | IDE interface         |   CN6    | Green PC     |   JP45   |
          |                       |          | connector    |          |
          |-----------------------+----------+--------------+----------|
          | Floppy drive          |   CN7    | Riser slot   |   SL1    |
          | interface             |          |              |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function               | Label |   Position   |
          |-------------------------------------+-------+--------------|
          | » | Factory configured - do not     |  J9   | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     |  J10  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     |  JP4  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     |  JP6  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     |  JP7  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     |  JP8  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     |  JP9  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP10  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP11  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP12  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP13  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP30  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP39  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP40  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP41  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP42  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP43  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP46  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP47  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP48  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP49  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          |   | I/O check ready enabled         | JP52  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | I/O check ready disabled        | JP52  |     Open     |
          |---+---------------------------------+-------+--------------|
          |   | IDE mode enabled                | JP53  | Pins 6 & 11  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          |   | IDE mode disabled               | JP53  |  Pins 1 & 6  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP54  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP55  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP56  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | IRQ9 disabled                   | JP57  |     Open     |
          |---+---------------------------------+-------+--------------|
          |   | IRQ9 enabled                    | JP57  |    Closed    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             USER CONFIGURABLE SETTINGS (CON'T)             |
          |------------------------------------------------------------|
          |              Function               | Label |   Position   |
          |-------------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP58  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP60  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | CMOS memory normal operation    | JP66  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | CMOS memory clear               | JP65  |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP66  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP67  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP68  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP69  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP70  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP71  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP72  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP73  | Unidentified |
          |   | alter                           |       |              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     SIMM CONFIGURATION                     |
          |------------------------------------------------------------|
          | 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      |            |            |
          |------+-------------+-------------+------------+------------|
          | 3MB  | (1) 256K x  | (1) 256K x  | (1) 256K x |    None    |
          |      |     36      |     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) 1M x 36 | (1) 256K x  |    None    |    None    |
          |      |             |     36      |            |            |
          |------+-------------+-------------+------------+------------|
          | 6MB  | (1) 1M x 36 | (1) 256K x  | (1) 256K x |    None    |
          |      |             |     36      |     36     |            |
          |------+-------------+-------------+------------+------------|
          | 7MB  | (1) 1M x 36 | (1) 256K x  | (1) 256K x | (1) 256K x |
          |      |             |     36      |     36     |     36     |
          |------+-------------+-------------+------------+------------|
          | 8MB  | (1) 2M x 36 |    None     |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 8MB  | (1) 1M x 36 | (1) 1M x 36 |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 9MB  | (1) 2M x 36 | (1) 256K x  |    None    |    None    |
          |      |             |     36      |            |            |
          |------+-------------+-------------+------------+------------|
          | 10MB | (1) 2M x 36 | (1) 256K x  | (1) 256K x |    None    |
          |      |             |     36      |     36     |            |
          |------+-------------+-------------+------------+------------|
          | 11MB | (1) 2M x 36 | (1) 256K x  | (1) 256K x | (1) 256K x |
          |      |             |     36      |     36     |     36     |
          |------+-------------+-------------+------------+------------|
          | 12MB | (1) 2M x 36 | (1) 1M x 36 |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 12MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |    None    |
          |      |             |             |     36     |            |
          |------+-------------+-------------+------------+------------|
          | 12MB | (1) 1M x 36 | (1) 2M x 36 |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 16MB | (1) 4M x 36 |    None     |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 16MB | (1) 2M x 36 | (1) 1M x 36 |  (1) 1M x  |    None    |
          |      |             |             |     36     |            |
          |------+-------------+-------------+------------+------------|
          | 16MB | (1) 2M x 36 | (1) 2M x 36 |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 16MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
          |      |             |             |     36     |     36     |
          |------+-------------+-------------+------------+------------|
          | 17MB | (1) 4M x 36 | (1) 256K x  |    None    |    None    |
          |      |             |     36      |            |            |
          |------+-------------+-------------+------------+------------|
          | 18MB | (1) 4M x 36 | (1) 256K x  | (1) 256K x |    None    |
          |      |             |     36      |     36     |            |
          |------+-------------+-------------+------------+------------|
          | 20MB | (1) 4M x 36 | (1) 1M x 36 |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 20MB | (1) 2M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
          |      |             |             |     36     |     36     |
          |------+-------------+-------------+------------+------------|
          | 24MB | (1) 2M x 36 | (1) 2M x 36 |  (1) 2M x  |    None    |
          |      |             |             |     36     |            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 SIMM CONFIGURATION (CON'T)                 |
          |------------------------------------------------------------|
          | Size  |   Bank 0    |   Bank 1   |   Bank 2   |   Bank 3   |
          |-------+-------------+------------+------------+------------|
          | 32MB  | (1) 8M x 36 |    None    |    None    |    None    |
          |-------+-------------+------------+------------+------------|
          | 32MB  | (1) 4M x 36 |  (1) 2M x  |  (1) 2M x  |    None    |
          |       |             |     36     |     36     |            |
          |-------+-------------+------------+------------+------------|
          | 32MB  | (1) 4M x 36 |  (1) 4M x  |    None    |    None    |
          |       |             |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          | 34MB  | (1) 8M x 36 | (1) 512K x |    None    |    None    |
          |       |             |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          | 36MB  | (1) 1M x 36 |  (1) 4M x  |  (1) 4M x  |    None    |
          |       |             |     36     |     36     |            |
          |-------+-------------+------------+------------+------------|
          | 36MB  | (1) 1M x 36 |  (1) 8M x  |    None    |    None    |
          |       |             |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          | 40MB  | (1) 8M x 36 |  (1) 1M x  |  (1) 1M x  |    None    |
          |       |             |     36     |     36     |            |
          |-------+-------------+------------+------------+------------|
          | 40MB  | (1) 8M x 36 |  (1) 2M x  |    None    |    None    |
          |       |             |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          | 40MB  | (1) 4M x 36 |  (1) 2M x  |  (1) 2M x  |  (1) 2M x  |
          |       |             |     36     |     36     |     36     |
          |-------+-------------+------------+------------+------------|
          | 48MB  | (1) 8M x 36 |  (1) 4M x  |    None    |    None    |
          |       |             |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          | 48MB  | (1) 4M x 36 |  (1) 4M x  |  (1) 4M x  |    None    |
          |       |             |     36     |     36     |            |
          |-------+-------------+------------+------------+------------|
          | 56MB  | (1) 8M x 36 |  (1) 2M x  |  (1) 2M x  |  (1) 2M x  |
          |       |             |     36     |     36     |     36     |
          |-------+-------------+------------+------------+------------|
          | 64MB  | (1) 8M x 36 |  (1) 4M x  |  (1) 4M x  |    None    |
          |       |             |     36     |     36     |            |
          |-------+-------------+------------+------------+------------|
          | 64MB  | (1) 8M x 36 |  (1) 8M x  |    None    |    None    |
          |       |             |     36     |            |            |
          |-------+-------------+------------+------------+------------|
          | 64MB  | (1) 4M x 36 |  (1) 4M x  |  (1) 4M x  |  (1) 4M x  |
          |       |             |     36     |     36     |     36     |
          |-------+-------------+------------+------------+------------|
          | 80MB  | (1) 8M x 36 |  (1) 4M x  |  (1) 4M x  |  (1) 4M x  |
          |       |             |     36     |     36     |     36     |
          |-------+-------------+------------+------------+------------|
          | 96MB  | (1) 8M x 36 |  (1) 8M x  |  (1) 8M x  |    None    |
          |       |             |     36     |     36     |            |
          |-------+-------------+------------+------------+------------|
          | 128MB | (1) 8M x 36 |  (1) 8M x  |  (1) 8M x  |  (1) 8M x  |
          |       |             |     36     |     36     |     36     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |        TAG         |
          |------------------+--------------------+--------------------|
          |      128KB       |    (4) 32K x 8     |     (1) 8K x 8     |
          |------------------+--------------------+--------------------|
          |      256KB       |    (4) 64K x 8     |    (1) 32K x 8     |
          |------------------+--------------------+--------------------|
          |      512KB       |    (4) 128K x 8    |    (1) 32K x 8     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          | Size  |      JP33       |      JP34      |  JP35  |  JP36  |
          |-------+-----------------+----------------+--------+--------|
          | 128KB |   Pins 2 & 3    |   Pins 2 & 3   |  Open  |  Open  |
          |       |     closed      |     closed     |        |        |
          |-------+-----------------+----------------+--------+--------|
          | 256KB |   Pins 1 & 2    |   Pins 2 & 3   |  Open  |  Open  |
          |       |     closed      |     closed     |        |        |
          |-------+-----------------+----------------+--------+--------|
          | 512KB |   Pins 1 & 2    |   Pins 1 & 2   | Closed | Closed |
          |       |     closed      |     closed     |        |        |
          +------------------------------------------------------------+
       
          +---------------------------------------------------------+
          |               VIDEO MEMORY CONFIGURATION                |
          |---------------------------------------------------------|
          | Note: The location of the video memory is unidentified. |
          +---------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CPU SPEED SELECTION                     |
          |------------------------------------------------------------|
          |     Speed     |     JP1      |     JP2      |     JP3      |
          |---------------+--------------+--------------+--------------|
          |     20MHz     |    Closed    |    Closed    |    Closed    |
          |---------------+--------------+--------------+--------------|
          |     25MHz     |     Open     |    Closed    |    Closed    |
          |---------------+--------------+--------------+--------------|
          |     33MHz     |     Open     |     Open     |     Open     |
          |---------------+--------------+--------------+--------------|
          |     40MHz     |     Open     |     Open     |    Closed    |
          |---------------+--------------+--------------+--------------|
          |    50iMHz     |     Open     |    Closed    |    Closed    |
          |---------------+--------------+--------------+--------------|
          |    66iMHz     |     Open     |     Open     |     Open     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     CPU TYPE SELECTION                     |
          |------------------------------------------------------------|
          |    Type    |  JP5  |         JP14          |     JP16      |
          |------------+-------+-----------------------+---------------|
          |  80486SX   | 1 & 2 | 3 & 5, 17 & 19, 16 &  |     Open      |
          |            |       |          18           |               |
          |------------+-------+-----------------------+---------------|
          |   CX M6    | 2 & 3 |  1 & 3, 6 & 8, 16 &   | 1 & 2, 3 & 4, |
          |            |       |      18, 17 & 19      |     8 & 9     |
          |------------+-------+-----------------------+---------------|
          |  80486DX   | 1 & 2 | 3 & 5, 14 & 16, 17 &  | 1 & 2, 3 & 4  |
          |            |       |          19           |               |
          |------------+-------+-----------------------+---------------|
          | SL80486DX  | 1 & 2 |  2 & 4, 3 & 5, 14 &   | 1 & 2, 3 & 4, |
          |            |       |      16, 17 & 19      |     7 & 8     |
          |------------+-------+-----------------------+---------------|
          |   CX M7    | 2 & 3 |  1 & 3, 6 & 8, 14 &   | 1 & 2, 5 & 6, |
          |            |       |      16, 17 & 19      |     8 & 9     |
          |------------+-------+-----------------------+---------------|
          |  80486DX2  | 1 & 2 | 3 & 5, 14 & 16, 17 &  | 1 & 2, 3 & 4  |
          |            |       |          19           |               |
          |------------+-------+-----------------------+---------------|
          | SL80486DX2 | 1 & 2 |  2 & 4, 3 & 5, 14 &   | 1 & 2, 3 & 4, |
          |            |       |      16, 17 & 19      |     7 & 8     |
          |------------+-------+-----------------------+---------------|
          |    P24D    | Open  | 2 & 4, 14 & 16, 17 &  | 1 & 2, 3 & 4, |
          |            |       |          19           |     7 & 8     |
          |------------+-------+-----------------------+---------------|
          |    P24T    | Open  | 1 & 3, 7 & 9, 14 & 16 | 1 & 2, 3 & 4, |
          |            |       |                       |     7 & 8     |
          |------------------------------------------------------------|
          | Note: Pins designated should be in the closed position.    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CPU TYPE SELECTION (CON'T)                 |
          |------------------------------------------------------------|
          |     Type     |   JP26   |   JP28    |   JP29    |   JP32   |
          |--------------+----------+-----------+-----------+----------|
          |   80486SX    |   Open   |   Open    |   Open    |   Open   |
          |--------------+----------+-----------+-----------+----------|
          |    CX M6     |   Open   |   Open    |  Closed   |   Open   |
          |--------------+----------+-----------+-----------+----------|
          |   80486DX    |   Open   |   Open    |   Open    |  Closed  |
          |--------------+----------+-----------+-----------+----------|
          |  SL80486DX   |   Open   |  Closed   |   Open    |  Closed  |
          |--------------+----------+-----------+-----------+----------|
          |    CX M7     |   Open   |   Open    |  Closed   |  Closed  |
          |--------------+----------+-----------+-----------+----------|
          |   80486DX2   |   Open   |   Open    |   Open    |  Closed  |
          |--------------+----------+-----------+-----------+----------|
          |  SL80486DX2  |   Open   |  Closed   |   Open    |  Closed  |
          |--------------+----------+-----------+-----------+----------|
          |     P24D     |  1 & 3   |  Closed   |  Closed   |  Closed  |
          |--------------+----------+-----------+-----------+----------|
          |     P24T     |  2 & 4   |  Closed   |  Closed   |  Closed  |
          |------------------------------------------------------------|
          | Note: Pins designated should be in the closed position.    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CPU TYPE SELECTION (CON'T)                 |
          |------------------------------------------------------------|
          |    Type     |      JP37      |  JP44   |  JP59   |  JP61   |
          |-------------+----------------+---------+---------+---------|
          |   80486SX   |      Open      |  Open   |  Open   |  Open   |
          |-------------+----------------+---------+---------+---------|
          |    CX M6    | 5 & 6, 9 & 10  |  Open   | Closed  | Closed  |
          |-------------+----------------+---------+---------+---------|
          |   80486DX   |     9 & 10     | Closed  |  Open   |  Open   |
          |-------------+----------------+---------+---------+---------|
          |  SL80486DX  |     9 & 10     | Closed  | Closed  |  Open   |
          |-------------+----------------+---------+---------+---------|
          |    CX M7    | 5 & 6, 9 & 10  | Closed  | Closed  | Closed  |
          |-------------+----------------+---------+---------+---------|
          |  80486DX2   |     9 & 10     | Closed  |  Open   |  Open   |
          |-------------+----------------+---------+---------+---------|
          | SL80486DX2  |     9 & 10     | Closed  | Closed  |  Open   |
          |-------------+----------------+---------+---------+---------|
          |    P24D     |     7 & 8      | Closed  |  Open   |  Open   |
          |-------------+----------------+---------+---------+---------|
          |    P24T     |      Open      | Closed  |  Open   |  Open   |
          |------------------------------------------------------------|
          | Note: Pins designated should be in the closed position.    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU VOLTAGE SELECTION                    |
          |------------------------------------------------------------|
          |      Voltage       |       JP17        |       JP31        |
          |--------------------+-------------------+-------------------|
          |        3.3v        |       Open        |       Open        |
          |--------------------+-------------------+-------------------|
          |         5v         |      Closed       |      Closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   VL BUS SPEED SELECTION                   |
          |------------------------------------------------------------|
          |           Speed            |             JP53              |
          |----------------------------+-------------------------------|
          |          <= 33MHz          |       Pins 3 & 8 closed       |
          |----------------------------+-------------------------------|
          |          >33 MHz           |      Pins 8 & 13 closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 HARD DRIVE MODE SELECTION                  |
          |------------------------------------------------------------|
          |            Mode            |             JP53              |
          |----------------------------+-------------------------------|
          |             0              |  Pins 9 & 14, 10 & 15 closed  |
          |----------------------------+-------------------------------|
          |             1              |  Pins 4 & 9, 10 & 15 closed   |
          |----------------------------+-------------------------------|
          |             2              |  Pins 5 & 10, 9 & 14 closed   |
          |----------------------------+-------------------------------|
          |             3              |   Pins 4 & 9, 5 & 10 closed   |
          +------------------------------------------------------------+