UNIDENTIFIED
============

   P55-ET

   Processor        Pentium                                       
   Processor Speed  75/90/100/120/133/150/166MHz                  
   Chip Set         Intel                                         
   Video Chip Set   None                                          
   Maximum Onboard  128MB (EDO supported)                         
   Memory           
   Maximum Video    None                                          
   Memory           
   Cache            256/512KB                                     
   BIOS             Award                                         
   Dimensions       330mm x 218mm                                 
   I/O Options      32-bit PCI slots (4), floppy drive interface, 
                    green PC connector, IDE interfaces (2),       
                    parallel port, PS/2 mouse port, PS/2 mouse    
                    interface, serial ports (2), cache slot, VRM  
                    connector                                     
   NPU Options      None                                          

<gopher://bitreich.org/I/th99/m/U-Z/33536-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | Serial port 2     |   CN1    | Turbo switch     |    J4    |
   |-------------------+----------+------------------+----------|
   | Serial port 1     |   CN2    | Turbo LED        |    J5    |
   |-------------------+----------+------------------+----------|
   | Parallel port     |   CN3    | Green PC LED     |    J6    |
   |-------------------+----------+------------------+----------|
   | Floppy drive      |   CN4    | Chassis fan      |    J7    |
   | interface         |          | power            |          |
   |-------------------+----------+------------------+----------|
   | IDE interface 2   |   CN5    | PS/2 mouse       |   J10    |
   |                   |          | interface        |          |
   |-------------------+----------+------------------+----------|
   | IDE interface 1   |   CN6    | IDE interface    |   JP5    |
   |                   |          | LED              |          |
   |-------------------+----------+------------------+----------|
   | PS/2 mouse port   |   CN7    | Green PC         |   JP14   |
   |                   |          | connector        |          |
   |-------------------+----------+------------------+----------|
   | Power LED &       |    J1    | 32-bit PCI slots |  PC1 -   |
   | keylock           |          |                  |   PC4    |
   |-------------------+----------+------------------+----------|
   | Speaker           |    J2    | Cache slot       |   SL1    |
   |-------------------+----------+------------------+----------|
   | Reset switch      |    J3    | VRM connector    |   VRM    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Label |   Position    |
   |------------------------------------+-------+---------------|
   |>> | SMC chip enabled               |  J24  |     Open      |
   |---+--------------------------------+-------+---------------|
   |   | SMC chip disabled              |  J24  |    Closed     |
   |---+--------------------------------+-------+---------------|
   |>> | Flash BIOS voltage select 5v   |  JP6  |  Pins 1 & 2   |
   |   |                                |       |    closed     |
   |---+--------------------------------+-------+---------------|
   |   | Flash BIOS voltage select 12v  |  JP6  |  Pins 2 & 3   |
   |   |                                |       |    closed     |
   |---+--------------------------------+-------+---------------|
   |   | Jumper information unavailable | JP12  | Unidentified  |
   |---+--------------------------------+-------+---------------|
   |>> | Clock rate set as AT CLOCK     | JP15  |  Pins 1 & 2   |
   |   |                                |       |    closed     |
   |---+--------------------------------+-------+---------------|
   |   | Clock rate set as 12MHz        | JP15  |  Pins 2 & 3   |
   |   |                                |       |    closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |     Size      |        Bank 0         |       Bank 1       |
   |---------------+-----------------------+--------------------|
   |      8MB      |      (2) 1M x 36      |        None        |
   |---------------+-----------------------+--------------------|
   |     16MB      |      (2) 1M x 36      |    (2) 1M x 36     |
   |---------------+-----------------------+--------------------|
   |     16MB      |      (2) 2M x 36      |        None        |
   |---------------+-----------------------+--------------------|
   |     24MB      |      (2) 1M x 36      |    (2) 2M x 36     |
   |---------------+-----------------------+--------------------|
   |     24MB      |      (2) 2M x 36      |    (2) 1M x 36     |
   |---------------+-----------------------+--------------------|
   |     32MB      |      (2) 2M x 36      |    (2) 2M x 36     |
   |---------------+-----------------------+--------------------|
   |     32MB      |      (2) 4M x 36      |        None        |
   |---------------+-----------------------+--------------------|
   |     40MB      |      (2) 1M x 36      |    (2) 4M x 36     |
   |---------------+-----------------------+--------------------|
   |     40MB      |      (2) 4M x 36      |    (2) 1M x 36     |
   |---------------+-----------------------+--------------------|
   |     48MB      |      (2) 2M x 36      |    (2) 4M x 36     |
   |---------------+-----------------------+--------------------|
   |     48MB      |      (2) 4M x 36      |    (2) 2M x 36     |
   |---------------+-----------------------+--------------------|
   |     64MB      |      (2) 4M x 36      |    (2) 4M x 36     |
   |---------------+-----------------------+--------------------|
   |     64MB      |      (2) 8M x 36      |        None        |
   |---------------+-----------------------+--------------------|
   |     72MB      |      (2) 1M x 36      |    (2) 8M x 36     |
   |---------------+-----------------------+--------------------|
   |     72MB      |      (2) 8M x 36      |    (2) 1M x 36     |
   |---------------+-----------------------+--------------------|
   |     80MB      |      (2) 2M x 36      |    (2) 8M x 36     |
   |---------------+-----------------------+--------------------|
   |     80MB      |      (2) 8M x 36      |    (2) 2M x 36     |
   |---------------+-----------------------+--------------------|
   |     96MB      |      (2) 4M x 36      |    (2) 8M x 36     |
   |---------------+-----------------------+--------------------|
   |     96MB      |      (2) 8M x 36      |    (2) 4M x 36     |
   |---------------+-----------------------+--------------------|
   |     128MB     |      (2) 8M x 36      |    (2) 8M x 36     |
   |------------------------------------------------------------|
   | Note: Board accepts EDO memory. Board also accepts x 32    |
   | SIMMs.                                                     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |    Bank 0    |      TAG      |      SL1       |
   |------------+--------------+---------------+----------------|
   | 256KB (A)  | (2) 32K x 32 |     None      |  256KB module  |
   |            |              |               |   installed    |
   |------------+--------------+---------------+----------------|
   | 256KB (B)  | (2) 32K x 32 | (1) 8K/16K x  | Not installed  |
   |            |              |       8       |                |
   |------------+--------------+---------------+----------------|
   | 512KB (A)  | (2) 64K x 32 | (1) 16K/32K x | Not installed  |
   |            |              |       8       |                |
   |------------+--------------+---------------+----------------|
   | 512KB (B)  | (2) 32K x 32 | (1) 16K/32K x |  256KB module  |
   |            |              |       8       |   installed    |
   |------------------------------------------------------------|
   | Note: If 256KB (A) configuration is used, see jumper       |
   | setting for TP1 below.                                     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |       Size       |        JP10        |        JP11        |
   |------------------+--------------------+--------------------|
   |    256KB (B)     | Pins 1 & 2 closed  | Pins 1 & 2 closed  |
   |------------------+--------------------+--------------------|
   |    512KB (A)     | Pins 1 & 2 closed  | Pins 1 & 2 closed  |
   |------------------+--------------------+--------------------|
   |    512KB (B)     | Pins 2 & 3 closed  | Pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |            Size            |              TP1              |
   |----------------------------+-------------------------------|
   |       Bank 0 enabled       |             Open              |
   |----------------------------+-------------------------------|
   |      Bank 0 disabled       |   Pins 1 & 2, 3 & 4 closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CPU SPEED SELECTION                     |
   |------------------------------------------------------------|
   |  CPU  |  Clock  |Multiplier| J25 | JP7 | JP9 | JPS1 | JPS2 |
   | speed |  speed  |          |     |     |     |      |      |
   |-------+---------+----------+-----+-----+-----+------+------|
   | 75MHz |  50MHz  |   1.5x   |1 & 2|2 & 3|2 & 3| Open | Open |
   |-------+---------+----------+-----+-----+-----+------+------|
   | 90MHz |  60MHz  |   1.5x   |2 & 3|2 & 3|2 & 3|Closed| Open |
   |-------+---------+----------+-----+-----+-----+------+------|
   |100MHz |  66MHz  |   1.5x   |2 & 3|2 & 3|2 & 3|Closed|Closed|
   |-------+---------+----------+-----+-----+-----+------+------|
   |120MHz |  60MHz  |    2x    |2 & 3|1 & 2|2 & 3|Closed| Open |
   |-------+---------+----------+-----+-----+-----+------+------|
   |133MHz |  66MHz  |    2x    |2 & 3|1 & 2|2 & 3|Closed|Closed|
   |-------+---------+----------+-----+-----+-----+------+------|
   |150MHz |  60MHz  |   2.5x   |2 & 3|1 & 2|1 & 2|Closed| Open |
   |-------+---------+----------+-----+-----+-----+------+------|
   |166MHz |  66MHz  |   2.5x   |2 & 3|1 & 2|1 & 2|Closed|Closed|
   |------------------------------------------------------------|
   |Note: Pins designated should be in the closed position.     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     CPU TYPE SELECTION                     |
   |------------------------------------------------------------|
   |            Type            |              JP1              |
   |----------------------------+-------------------------------|
   |         P54C/P54CS         |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |         P55C/P55CT         |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/m/U-Z/33536-2.png>
   

   +------------------------------------------------------------+
   |       CACHE JUMPER CONFIGURATION (ESCM CACHE MODULE)       |
   |------------------------------------------------------------|
   |           Size           |               JP1               |
   |--------------------------+---------------------------------|
   |          256KB           |    Pins 1 & 2, 5 & 6 closed     |
   |--------------------------+---------------------------------|
   |          512KB           |    Pins 2 & 3, 4 & 5 closed     |
   +------------------------------------------------------------+