(TXT) View Source
       
       # IBM CORPORATION
       
          PERSONAL SYSTEM/2 HMM
       
       Processor  80486SX/80486DX/80486DX2/80486DX4/P24T                        
       Processor  25/33/50(internal/66(internal)/75(internal)/100(internal)/MHz 
       Speed      
       Chip Set   Unidentified                                                  
       Video Chip None                                                          
       Set        
       Maximum    Unidentified                                                  
       Onboard    
       Memory     
       Maximum    None                                                          
       Video      
       Memory     
       Cache      128/256KB                                                     
       BIOS       Unidentified                                                  
       Dimensions 254mm x 218mm                                                 
       I/O        32-bit PCI slots (3), floppy drive interface, IDE interfaces  
       Options    (2), parallel port, PS/2 mouse port, serial ports (2)         
       NPU        None                                                          
       Options    
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose          | Location | Purpose           | Location |
          |------------------+----------+-------------------+----------|
          | PS/2 mouse port  |    J2    | IDE interface 1   |   J21    |
          |------------------+----------+-------------------+----------|
          | Speaker          |    J5    | IDE interface 2   |   J22    |
          |------------------+----------+-------------------+----------|
          | Parallel port    |    J8    | 32-bit PCI slots  |  PC1 –   |
          |                  |          |                   |   PC3    |
          |------------------+----------+-------------------+----------|
          | Floppy drive     |    J9    | Power LED         |   W12    |
          | interface        |          |                   |          |
          |------------------+----------+-------------------+----------|
          | Serial port 2    |   J10    | IDE interface LED |   W39    |
          |                  |          | (PCI)             |          |
          |------------------+----------+-------------------+----------|
          | Serial port 1    |   J11    | IDE interface LED |   W46    |
          |                  |          | (ISA)             |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function                | Label |  Position  |
          |---------------------------------------+-------+------------|
          | » | Secondary cache write select      |  W1   | Pins 2 & 3 |
          |   | write back                        |       |   closed   |
          |---+-----------------------------------+-------+------------|
          |   | Secondary cache write select      |  W1   | Pins 1 & 2 |
          |   | write through                     |       |   closed   |
          |---+-----------------------------------+-------+------------|
          | » | Internal cache write select write |  W4   |    Open    |
          |   | through                           |       |            |
          |---+-----------------------------------+-------+------------|
          |   | Internal cache write select write |  W4   |   Closed   |
          |   | back                              |       |            |
          |---+-----------------------------------+-------+------------|
          | » | Flash BIOS normal operation       |  W6   | Pins 2 & 3 |
          |   |                                   |       |   closed   |
          |---+-----------------------------------+-------+------------|
          |   | Flash BIOS recovery mode          |  W6   | Pins 1 & 2 |
          |   |                                   |       |   closed   |
          |---+-----------------------------------+-------+------------|
          | » | Factory configured - do not alter |  W8   |   Closed   |
          |---+-----------------------------------+-------+------------|
          | » | PS/2 mouse installed              |  W10  |   Closed   |
          |---+-----------------------------------+-------+------------|
          |   | PS/2 mouse not installed          |  W10  |    Open    |
          |---+-----------------------------------+-------+------------|
          |   | Parity generation select DPU      |  W17  | Pins 1 & 2 |
          |   |                                   |       |   closed   |
          |---+-----------------------------------+-------+------------|
          |   | Parity generation select CPU      |  W17  | Pins 2 & 3 |
          |   |                                   |       |   closed   |
          |---+-----------------------------------+-------+------------|
          | » | DPU does not force parity         |  W18  | Pins 2 & 3 |
          |   |                                   |       |   closed   |
          |---+-----------------------------------+-------+------------|
          |   | DPU forces parity                 |  W18  | Pins 1 & 2 |
          |   |                                   |       |   closed   |
          |---+-----------------------------------+-------+------------|
          | » | Factory configured - do not alter |  W19  |   Closed   |
          |---+-----------------------------------+-------+------------|
          | » | Cache installed                   |  W21  |    Open    |
          |---+-----------------------------------+-------+------------|
          |   | Cache not installed               |  W21  |   Closed   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          | Note: The maximum size and configuration is unidentified.  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          | Note: The location and configuration is unidentified.      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CACHE JUMPER SELECTION                   |
          |------------------------------------------------------------|
          |     Size     |      W5       |     W22      |     W23      |
          |--------------+---------------+--------------+--------------|
          |    128KB     |     Open      |    Closed    |     Open     |
          |--------------+---------------+--------------+--------------|
          |    256KB     |    Closed     |     Open     |    Closed    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE TAG SELECTION                     |
          |------------------------------------------------------------|
          |         Size         |       W24        |       W26        |
          |----------------------+------------------+------------------|
          |   |      7-bit       |       Open       |      Closed      |
          |---+------------------+------------------+------------------|
          |   |      8-bit       |      Closed      |      Closed      |
          |---+------------------+------------------+------------------|
          | » |      9-bit       |      Closed      |       Open       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CPU SPEED SELECTION                     |
          |------------------------------------------------------------|
          |       Speed        |        W16        |        W20        |
          |--------------------+-------------------+-------------------|
          |       25MHz        |       Open        |      Closed       |
          |--------------------+-------------------+-------------------|
          |       33MHz        |      Closed       |       Open        |
          |--------------------+-------------------+-------------------|
          |       50iMHz       |       Open        |      Closed       |
          |--------------------+-------------------+-------------------|
          |       66iMHz       |      Closed       |       Open        |
          |--------------------+-------------------+-------------------|
          |       75iMHz       |       Open        |      Closed       |
          |--------------------+-------------------+-------------------|
          |      100iMHz       |      Closed       |       Open        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     CPU TYPE SELECTION                     |
          |------------------------------------------------------------|
          |      Type       |            W2            |      W3       |
          |-----------------+--------------------------+---------------|
          |     80486SX     |    Pins 2 & 3 closed     |    Closed     |
          |-----------------+--------------------------+---------------|
          |     80486DX     | Pins 1 & 2, 3 & 4 closed |    Closed     |
          |-----------------+--------------------------+---------------|
          |    80486DX2     | Pins 1 & 2, 3 & 4 closed |    Closed     |
          |-----------------+--------------------------+---------------|
          |    80486DX4     | Pins 1 & 2, 3 & 4 closed |    Closed     |
          |-----------------+--------------------------+---------------|
          |      P24T       | Pins 1 & 2, 3 & 4 closed |     Open      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  CPU MULTIPLIER SELECTION                  |
          |------------------------------------------------------------|
          |         Multiplier         |              W33              |
          |----------------------------+-------------------------------|
          |             1x             |       Pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |             2x             |       Pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |             3x             |             Open              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   DMA CHANNEL SELECTION                    |
          |------------------------------------------------------------|
          |              Channel              |          W43           |
          |-----------------------------------+------------------------|
          | » |   ISA IDE used P10 transfer   |          Open          |
          |---+-------------------------------+------------------------|
          |   |               6               |   Pins 1 & 2 closed    |
          |---+-------------------------------+------------------------|
          |   |               7               |   Pins 2 & 3 closed    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   ISA IDE IRQ SELECTION                    |
          |------------------------------------------------------------|
          |            IRQ             |              W42              |
          |----------------------------+-------------------------------|
          |           IRQ14            |       Pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |           IRQ15            |       Pins 2 & 3 closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   PCI IDE IRQ SELECTION                    |
          |------------------------------------------------------------|
          |         IRQ          |       W35        |       W38        |
          |----------------------+------------------+------------------|
          | » |      IRQ14       |      Closed      |       Open       |
          |---+------------------+------------------+------------------|
          |   |      IRQ15       |       Open       |      Closed      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  PCI INTERRUPT SELECTION                   |
          |------------------------------------------------------------|
          |            Setting            |            W37             |
          |-------------------------------+----------------------------|
          |        INTR_A enabled         |           Closed           |
          |-------------------------------+----------------------------|
          |        INTR_A disabled        |            Open            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                PCI COMPLIANT IRQ SELECTION                 |
          |------------------------------------------------------------|
          |             IRQ              |            J101             |
          |------------------------------+-----------------------------|
          |             IRQ1             |            Pin 2            |
          |------------------------------+-----------------------------|
          |             IRQ3             |            Pin 3            |
          |------------------------------+-----------------------------|
          |             IRQ4             |            Pin 4            |
          |------------------------------+-----------------------------|
          |             IRQ5             |            Pin 5            |
          |------------------------------+-----------------------------|
          |             IRQ6             |            Pin 6            |
          |------------------------------+-----------------------------|
          |             IRQ7             |            Pin 7            |
          |------------------------------+-----------------------------|
          |             IRQ8             |            Pin 8            |
          |------------------------------+-----------------------------|
          |             IRQ9             |            Pin 9            |
          |------------------------------+-----------------------------|
          |            IRQ10             |           Pin 10            |
          |------------------------------+-----------------------------|
          |            IRQ11             |           Pin 11            |
          |------------------------------+-----------------------------|
          |            IRQ12             |           Pin 12            |
          |------------------------------+-----------------------------|
          |            IRQ14             |           Pin 13            |
          |------------------------------+-----------------------------|
          |            IRQ15             |           Pin 14            |
          +------------------------------------------------------------+