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       # IBM CORPORATION
       
          PC 330-486, PC 350-486
       
          Processor  80486SX/486 Overdrive/80486DX/80486DX2/80486DX4/P24T   
          Processor  20/25/33/40/50(internal)/50/66(internal)/75(internal)/ 
          Speed      100(internal)MHz                                       
          Chip Set   Unidentified                                           
          Video Chip None                                                   
          Set        
          Maximum    128MB                                                  
          Onboard    
          Memory     
          Maximum    Unidentified                                           
          Video      
          Memory     
          Cache      128/256KB                                              
          BIOS       Unidentified                                           
          Dimensions 330mm x 218mm                                          
          I/O        32-bit VESA/PCI local bus slot, floppy drive           
          Options    interface, IDE interfaces (2), parallel port, PS/2     
                     mouse port, serial ports (2),VESA feature connector,   
                     VGA port, riser slot, VRM connector                    
          NPU        None                                                   
          Options    
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose           | Location | Purpose          | Location |
          |-------------------+----------+------------------+----------|
          | Power LED         |   CN1    | IDE interface 2  |   J10    |
          |-------------------+----------+------------------+----------|
          | IDE interface LED |   CN2    | VESA feature     |   J14    |
          |                   |          | connector        |          |
          |-------------------+----------+------------------+----------|
          | PS/2 mouse port   |    J2    | Speaker          |   J27    |
          |-------------------+----------+------------------+----------|
          | Serial port 1     |    J3    | On/off switch    |   J29    |
          |                   |          | connector        |          |
          |-------------------+----------+------------------+----------|
          | Serial port 2     |    J4    | On/off switch    |   J30    |
          |                   |          | power supply     |          |
          |                   |          | connector        |          |
          |-------------------+----------+------------------+----------|
          | Parallel port     |    J5    | Riser slot       |   SL1    |
          |-------------------+----------+------------------+----------|
          | VGA port          |    J6    | 32-bit VESA/PCI  |   SL2    |
          |                   |          | local bus slot   |          |
          |-------------------+----------+------------------+----------|
          | Floppy drive      |    J7    | VRM connector    |   VRM    |
          | interface         |          |                  |          |
          |-------------------+----------+------------------+----------|
          | IDE interface 1   |    J9    |                  |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function               | Label |   Position   |
          |-------------------------------------+-------+--------------|
          | » | Flash BIOS write protect        |  J13  |  Pins 2 & 3  |
          |   | disabled                        |       |    closed    |
          |---+---------------------------------+-------+--------------|
          |   | Flash BIOS write protect        |  J13  |  Pins 1 & 2  |
          |   | enabled                         |       |    closed    |
          |---+---------------------------------+-------+--------------|
          | » | On board video enabled          |  J15  |  Pins 1 & 2  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          |   | On board video disabled         |  J15  |  Pins 2 & 3  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     |  JP2  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Modem answers on ring           |  JP5  |  Pins 2 & 3  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          |   | Modem does not answer on ring   |  JP5  |  Pins 1 & 2  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP11  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | PS/2 mouse enabled              | JP12  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | PS/2 mouse disabled             | JP12  |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | CMOS memory normal operation    | JP14  |  Pins 1 & 2  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          |   | CMOS memory clear               | JP14  |  Pins 2 & 3  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          | » | VGA IRQ9 enabled                | JP15  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | VGA IRQ9 disabled               | JP15  |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | Floppy drive write protect      |  WP   |     Open     |
          |   | disabled                        |       |              |
          |---+---------------------------------+-------+--------------|
          |   | Floppy drive write protect      |  WP   |    Closed    |
          |   | enabled                         |       |              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
          |------+-------------+-------------+------------+------------|
          | 4MB  | (1) 1M x 32 |    None     |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 8MB  | (1) 1M x 32 | (1) 1M x 32 |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 8MB  | (1) 2M x 32 |    None     |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 12MB | (1) 1M x 32 | (1) 1M x 32 |  (1) 1M x  |    None    |
          |      |             |             |     32     |            |
          |------+-------------+-------------+------------+------------|
          | 12MB | (1) 1M x 32 | (1) 2M x 32 |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 16MB | (1) 4M x 32 |    None     |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 16MB | (1) 1M x 32 | (1) 1M x 32 |  (1) 2M x  |    None    |
          |      |             |             |     32     |            |
          |------+-------------+-------------+------------+------------|
          | 16MB | (1) 2M x 32 | (1) 2M x 32 |    None    |    None    |
          |------+-------------+-------------+------------+------------|
          | 16MB | (1) 1M x 32 | (1) 1M x 32 |  (1) 1M x  |  (1) 1M x  |
          |      |             |             |     32     |     32     |
          |------+-------------+-------------+------------+------------|
          | 20MB | (1) 1M x 32 | (1) 2M x 32 |  (1) 2M x  |    None    |
          |      |             |             |     32     |            |
          |------+-------------+-------------+------------+------------|
          | 20MB | (1) 1M x 32 | (1) 4M x 32 |    None    |    None    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 DRAM CONFIGURATION (CON’T)                 |
          |------------------------------------------------------------|
          | Size  |   Bank 0    |   Bank 1   |   Bank 2   |   Bank 3   |
          |-------+-------------+------------+------------+------------|
          | 24MB  | (1) 2M x 32 |  (1) 2M x  |  (1) 2M x  |    None    |
          |       |             |     32     |     32     |            |
          |-------+-------------+------------+------------+------------|
          | 24MB  | (1) 1M x 32 |  (1) 1M x  |  (1) 2M x  |  (1) 2M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 24MB  | (1) 1M x 32 |  (1) 1M x  |  (1) 4M x  |    None    |
          |       |             |     32     |     32     |            |
          |-------+-------------+------------+------------+------------|
          | 28MB  | (1) 1M x 32 |  (1) 2M x  |  (1) 2M x  |  (1) 2M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 28MB  | (1) 1M x 32 |  (1) 1M x  |  (1) 4M x  |  (1) 1M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 32MB  | (1) 4M x 32 |  (1) 4M x  |    None    |    None    |
          |       |             |     32     |            |            |
          |-------+-------------+------------+------------+------------|
          | 32MB  | (1) 8M x 32 |    None    |    None    |    None    |
          |-------+-------------+------------+------------+------------|
          | 32MB  | (1) 2M x 32 |  (1) 2M x  |  (1) 4M x  |    None    |
          |       |             |     32     |     32     |            |
          |-------+-------------+------------+------------+------------|
          | 32MB  | (1) 2M x 32 |  (1) 2M x  |  (1) 2M x  |  (1) 2M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 36MB  | (1) 1M x 32 |  (1) 4M x  |  (1) 4M x  |    None    |
          |       |             |     32     |     32     |            |
          |-------+-------------+------------+------------+------------|
          | 40MB  | (1) 1M x 32 |  (1) 1M x  |  (1) 8M x  |    None    |
          |       |             |     32     |     32     |            |
          |-------+-------------+------------+------------+------------|
          | 40MB  | (1) 1M x 32 |  (1) 1M x  |  (1) 4M x  |  (1) 4M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 48MB  | (1) 4M x 32 |  (1) 4M x  |  (1) 4M x  |    None    |
          |       |             |     32     |     32     |            |
          |-------+-------------+------------+------------+------------|
          | 48MB  | (1) 2M x 32 |  (1) 2M x  |  (1) 8M x  |    None    |
          |       |             |     32     |     32     |            |
          |-------+-------------+------------+------------+------------|
          | 48MB  | (1) 2M x 32 |  (1) 2M x  |  (1) 4M x  |  (1) 4M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 52MB  | (1) 1M x 32 |  (1) 4M x  |  (1) 4M x  |  (1) 4M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 64MB  | (1) 8M x 32 |  (1) 8M x  |    None    |    None    |
          |       |             |     32     |            |            |
          |-------+-------------+------------+------------+------------|
          | 64MB  | (1) 4M x 32 |  (1) 4M x  |  (1) 8M x  |    None    |
          |       |             |     32     |     32     |            |
          |-------+-------------+------------+------------+------------|
          | 64MB  | (1) 4M x 32 |  (1) 4M x  |  (1) 4M x  |  (1) 4M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 68MB  | (1) 1M x 32 |  (1) 8M x  |  (1) 4M x  |  (1) 4M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 72MB  | (1) 1M x 32 |  (1) 1M x  |  (1) 8M x  |  (1) 8M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 80MB  | (1) 2M x 32 |  (1) 2M x  |  (1) 8M x  |  (1) 8M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 84MB  | (1) 1M x 32 |  (1) 8M x  |  (1) 8M x  |  (1) 4M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 96MB  | (1) 8M x 32 |  (1) 8M x  |  (1) 8M x  |    None    |
          |       |             |     32     |     32     |            |
          |-------+-------------+------------+------------+------------|
          | 96MB  | (1) 4M x 32 |  (1) 4M x  |  (1) 8M x  |  (1) 8M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 100MB | (1) 1M x 32 |  (1) 8M x  |  (1) 8M x  |  (1) 8M x  |
          |       |             |     32     |     32     |     32     |
          |-------+-------------+------------+------------+------------|
          | 128MB | (1) 8M x 32 |  (1) 8M x  |  (1) 8M x  |  (1) 8M x  |
          |       |             |     32     |     32     |     32     |
          |------------------------------------------------------------|
          | Note: Board also accepts x 36 SIMMs.                       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |    Size    |    Bank 0     |    Bank 1     |      TAG      |
          |------------+---------------+---------------+---------------|
          |   128KB    |  (4) 32K x 8  |     None      |  (1) 32K x 8  |
          |------------+---------------+---------------+---------------|
          |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (1) 32K x 8  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          |    Size     |        J16        |     J17      |    J38    |
          |-------------+-------------------+--------------+-----------|
          |    128KB    | Pins 2 & 3 closed |     Open     |   Open    |
          |-------------+-------------------+--------------+-----------|
          |    256KB    | Pins 1 & 2 closed |    Closed    |   Open    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CPU SPEED SELECTION                     |
          |------------------------------------------------------------|
          |     Speed     |     J35      |     J36      |     J37      |
          |---------------+--------------+--------------+--------------|
          |     20MHz     |    Closed    |     Open     |     Open     |
          |---------------+--------------+--------------+--------------|
          |     25MHz     |     Open     |    Closed    |    Closed    |
          |---------------+--------------+--------------+--------------|
          |     33MHz     |     Open     |    Closed    |     Open     |
          |---------------+--------------+--------------+--------------|
          |     40MHz     |     Open     |     Open     |    Closed    |
          |---------------+--------------+--------------+--------------|
          |    50iMHz     |     Open     |    Closed    |    Closed    |
          |---------------+--------------+--------------+--------------|
          |     50MHz     |     Open     |     Open     |     Open     |
          |---------------+--------------+--------------+--------------|
          |    66iMHz     |     Open     |    Closed    |     Open     |
          |---------------+--------------+--------------+--------------|
          |    75iMHz     |     Open     |    Closed    |    Closed    |
          |---------------+--------------+--------------+--------------|
          |    100iMHz    |     Open     |    Closed    |     Open     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     CPU TYPE SELECTION                     |
          |------------------------------------------------------------|
          |        Type        |        J23         |       J24        |
          |--------------------+--------------------+------------------|
          |      80486SX       | Pins 1 & 2 closed  |       Open       |
          |--------------------+--------------------+------------------|
          |   486 Overdrive    | Pins 2 & 3 closed  |       Open       |
          |--------------------+--------------------+------------------|
          |      80486DX       | Pins 2 & 3 closed  |       Open       |
          |--------------------+--------------------+------------------|
          |      80486DX2      | Pins 2 & 3 closed  |       Open       |
          |--------------------+--------------------+------------------|
          |      80486DX4      | Pins 2 & 3 closed  |       Open       |
          |--------------------+--------------------+------------------|
          |        P24T        | Pins 2 & 3 closed  |      Closed      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |          CPU MULTIPLIER SELECTION (80486DX4 ONLY)          |
          |------------------------------------------------------------|
          |         Multiplier          |             JP10             |
          |-----------------------------+------------------------------|
          |      Other multiplier       |      Pins 1 & 2 closed       |
          |-----------------------------+------------------------------|
          |             2x              |      Pins 3 & 4 closed       |
          |-----------------------------+------------------------------|
          |             3x              |             Open             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             LOCAL BUS SELECTION ON RISER SLOT              |
          |------------------------------------------------------------|
          |  Setting   |      JP3       |    JP4     |  JP7   |  JP13  |
          |------------+----------------+------------+--------+--------|
          | VESA local |   Pins 1 & 2   | Pins 1 & 2 |  Open  | Closed |
          |    bus     |     closed     |   closed   |        |        |
          |------------+----------------+------------+--------+--------|
          | PCI local  |   Pins 2 & 3   | Pins 2 & 3 | Closed |  Open  |
          |    bus     |     closed     |   closed   |        |        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   DMA CHANNEL SELECTION                    |
          |------------------------------------------------------------|
          |     Channel      |        JP8         |        JP9         |
          |------------------+--------------------+--------------------|
          |        1         | Pins 2 & 3 closed  | Pins 2 & 3 closed  |
          |------------------+--------------------+--------------------|
          |        3         | Pins 1 & 2 closed  | Pins 1 & 2 closed  |
          +------------------------------------------------------------+