EPOX COMPUTER CO., LTD.
=======================

   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/E-H/34502-1.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   |
   |-------------------------------------+-------+--------------|
   |>> | On board I/O enabled            |  J24  |     Open     |
   |---+---------------------------------+-------+--------------|
   |   | On board I/O disabled           |  J24  |    Closed    |
   |---+---------------------------------+-------+--------------|
   |>> | Flash BIOS voltage select 5v    |  JP6  |  Pins 1 & 2  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | Flash BIOS voltage select 12v   |  JP6  |  Pins 2 & 3  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP12  | Unidentified |
   |   | alter                           |       |              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     SIMM CONFIGURATION                     |
   |------------------------------------------------------------|
   |     Size      |        Bank 0        |       Bank 1        |
   |---------------+----------------------+---------------------|
   |      8MB      |     (2) 1M x 36      |        None         |
   |---------------+----------------------+---------------------|
   |     16MB      |     (2) 2M x 36      |        None         |
   |---------------+----------------------+---------------------|
   |     16MB      |     (2) 1M x 36      |     (2) 1M x 36     |
   |---------------+----------------------+---------------------|
   |     24MB      |     (2) 2M x 36      |     (2) 1M x 36     |
   |---------------+----------------------+---------------------|
   |     32MB      |     (2) 4M x 36      |        None         |
   |---------------+----------------------+---------------------|
   |     32MB      |     (2) 2M x 36      |     (2) 2M x 36     |
   |---------------+----------------------+---------------------|
   |     40MB      |     (2) 4M x 36      |     (2) 1M x 36     |
   |---------------+----------------------+---------------------|
   |     48MB      |     (2) 4M x 36      |     (2) 2M x 36     |
   |---------------+----------------------+---------------------|
   |     64MB      |     (2) 8M x 36      |        None         |
   |---------------+----------------------+---------------------|
   |     64MB      |     (2) 4M x 36      |     (2) 4M x 36     |
   |---------------+----------------------+---------------------|
   |     72MB      |     (2) 8M x 36      |     (2) 1M x 36     |
   |---------------+----------------------+---------------------|
   |     80MB      |     (2) 8M x 36      |     (2) 2M 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    |      SL1       |      TAG       |
   |-----------+--------------+----------------+----------------|
   | 256KB (A) | (2) 32K x 32 | Not installed  | (1) 8K/16K x 8 |
   |-----------+--------------+----------------+----------------|
   | 512KB (B) | (2) 64K x 32 | Not installed  | (1) 16K/32K x  |
   |           |              |                |       8        |
   |-----------+--------------+----------------+----------------|
   | 512KB (A) | (2) 32K x 32 |  256KB module  | (1) 16K/32K x  |
   |           |              |   installed    |       8        |
   +------------------------------------------------------------+

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

   +------------------------------------------------------------+
   |                ON BOARD CACHE CONFIGURATION                |
   |------------------------------------------------------------|
   |          Setting           |              TP1              |
   |----------------------------+-------------------------------|
   |          Enabled           |             Open              |
   |----------------------------+-------------------------------|
   |          Disabled          |   Pins 1 & 2, 3 & 4 closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CPU SPEED SELECTION                     |
   |------------------------------------------------------------|
   |CPU speed| Clock |Multiplier| J25 | JP7 | JP9 | JPS1 | JPS2 |
   |         | 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            |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |            P55C            |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  KEYBOARD CLOCK SELECTION                  |
   |------------------------------------------------------------|
   |       Setting        |      JP15A       |      JP15B       |
   |----------------------+------------------+------------------|
   |>> | Set by system AT |    Pins 1 & 2    |    Pins 1 & 2    |
   |   |      CLOCK       |      closed      |      closed      |
   |---+------------------+------------------+------------------|
   |   |   Clock rate -   |    Pins 2 & 3    |    Pins 2 & 3    |
   |   |      12MHz       |      closed      |      closed      |
   +------------------------------------------------------------+