IBM CORPORATION
===============

   PC SERVER 300 (TYPE 8640) OPO, 1P0, OPT, 1PT

   Processor        Pentium                                       
   Processor Speed  60MHz                                         
   Chip Set         Unidentified                                  
   Video Chip Set   None                                          
   Maximum Onboard  192MB                                         
   Memory           
   Maximum Video    None                                          
   Memory           
   Cache            256/512KB                                     
   BIOS             Unidentified                                  
   Dimensions       355mm x 304mm                                 
   I/O Options      32-bit PCI slots (3), floppy drive interface, 
                    IDE interface, parallel port, PS/2 mouse      
                    port, serial ports (2)                        
   NPU Options      None                                          

<gopher://bitreich.org/I/th99/m/I-L/34661-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | Speaker           |   J11    | IDE interface    |   J22    |
   |-------------------+----------+------------------+----------|
   | PS/2 mouse port   |   J15    | Auxiliary power  |    P3    |
   |-------------------+----------+------------------+----------|
   | Parallel port     |   J18    | Power LED        |    W9    |
   |-------------------+----------+------------------+----------|
   | Floppy drive      |   J19    | IDE interface    |   W10    |
   | interface         |          | LED              |          |
   |-------------------+----------+------------------+----------|
   | Serial port 1     |   J20    | 32-bit PCI slots |  PC1 -   |
   |                   |          |                  |   PC3    |
   |-------------------+----------+------------------+----------|
   | Serial port 2     |   J21    |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Label |  Position  |
   |---------------------------------------+-------+------------|
   |>> | Parity check enabled              |  J1   |   Closed   |
   |---+-----------------------------------+-------+------------|
   |   | Parity check disabled             |  J1   |    Open    |
   |---+-----------------------------------+-------+------------|
   |>> | Cache type select write back      |  J2   |    Open    |
   |---+-----------------------------------+-------+------------|
   |   | Cache type select write through   |  J2   |   Closed   |
   |---+-----------------------------------+-------+------------|
   |>> | Oscillator for U15                |  J6   | Pins 1 & 2 |
   |   |                                   |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | Clock synthesizer                 |  J6   | Pins 2 & 3 |
   |   |                                   |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |>> | BIOS normal operation             |  W2   | Pins 2 & 3 |
   |   |                                   |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | BIOS recovery mode                |  W2   | Pins 1 & 2 |
   |   |                                   |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |>> | PS/2 mouse enabled                |  W6   |   Closed   |
   |---+-----------------------------------+-------+------------|
   |   | PS/2 mouse disabled               |  W6   |    Open    |
   |---+-----------------------------------+-------+------------|
   |>> | Factory configured - do not alter |  W20  | Pins 2 & 3 |
   |   |                                   |       |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     SIMM CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |    Bank 0     |    Bank 1     |    Bank 2     |
   |------------+---------------+---------------+---------------|
   |    8MB     |  (2) 1M x 36  |     None      |     None      |
   |------------+---------------+---------------+---------------|
   |    16MB    |  (2) 1M x 36  |  (2) 1M x 36  |     None      |
   |------------+---------------+---------------+---------------|
   |    16MB    |  (2) 2M x 36  |     None      |     None      |
   |------------+---------------+---------------+---------------|
   |    24MB    |  (2) 1M x 36  |  (2) 1M x 36  |  (2) 1M x 36  |
   |------------+---------------+---------------+---------------|
   |    32MB    |  (2) 2M x 36  |  (2) 2M x 36  |     None      |
   |------------+---------------+---------------+---------------|
   |    32MB    |  (2) 4M x 36  |     None      |     None      |
   |------------+---------------+---------------+---------------|
   |    48MB    |  (2) 2M x 36  |  (2) 2M x 36  |  (2) 2M x 36  |
   |------------+---------------+---------------+---------------|
   |    64MB    |  (2) 4M x 36  |  (2) 4M x 36  |     None      |
   |------------+---------------+---------------+---------------|
   |    64MB    |  (2) 8M x 36  |     None      |     None      |
   |------------+---------------+---------------+---------------|
   |    96MB    |  (2) 4M x 36  |  (2) 4M x 36  |  (2) 4M x 36  |
   |------------+---------------+---------------+---------------|
   |   128MB    |  (2) 8M x 36  |  (2) 8M x 36  |     None      |
   |------------+---------------+---------------+---------------|
   |   128MB    | (2) 16M x 36  |     None      |     None      |
   |------------+---------------+---------------+---------------|
   |   192MB    |  (2) 8M x 36  |  (2) 8M x 36  |  (2) 8M x 36  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Note: The location of the cache is unidentified.           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |       J3        |       J4        |      J35       |
   |-------+-----------------+-----------------+----------------|
   | None  |   Pins 1 & 2    |   Pins 1 & 2    |      Open      |
   |       |     closed      |     closed      |                |
   |-------+-----------------+-----------------+----------------|
   | 256KB |   Pins 2 & 3    |   Pins 1 & 2    |   Pins 1 & 2   |
   |       |     closed      |     closed      |     closed     |
   |-------+-----------------+-----------------+----------------|
   | 512KB |   Pins 2 & 3    |   Pins 2 & 3    |   Pins 2 & 3   |
   |       |     closed      |     closed      |     closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CPU CLOCK SPEED SELECTION                  |
   |------------------------------------------------------------|
   |            Speed             |             J5              |
   |------------------------------+-----------------------------|
   |            50MHz             |           Closed            |
   |------------------------------+-----------------------------|
   |            66MHz             |            Open             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU VOLTAGE SELECTION                    |
   |------------------------------------------------------------|
   | Voltage |        J40         |     J41      |     J42      |
   |---------+--------------------+--------------+--------------|
   |   5v    |       Closed       |     N/A      |     N/A      |
   |---------+--------------------+--------------+--------------|
   |  5.3v   |    Power module    | Power module | Power module |
   |         |     installed      |  installed   |  installed   |
   |------------------------------------------------------------|
   | Note: All pins on J40 must be closed.                      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   DMA CHANNEL SELECTION                    |
   |------------------------------------------------------------|
   |     Channel      |        W14         |        W16         |
   |------------------+--------------------+--------------------|
   |        6         | Pins 1 & 2 closed  | Pins 1 & 2 closed  |
   |------------------+--------------------+--------------------|
   |        7         | Pins 2 & 3 closed  | Pins 2 & 3 closed  |
   +------------------------------------------------------------+