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# EPOX COMPUTER CO., LTD.
P55-BT
Processor CX 6X86/CX 6X86L/IBM 6X86/IBM 6X86L//CX
6X86MX/AM K5/ AM K6/Pentium
Processor Speed 90/100/120/133/150/166/180/200/225/233/266MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 256MB (EDO supported)
Memory
Maximum Video None
Memory
Cache 512KB
BIOS Award
Dimensions 254mm x 218mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
green PC connector, IDE interfaces (2),
parallel port, PS/2 mouse interface, serial
ports (2), IR connector, VRM connector, USB
connector, ATX power connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+----------------+-------------|
| ATX power | ATX | Soft off power | JP9 |
| connector | | supply | |
|------------------+----------+----------------+-------------|
| USB connector | CN1 | PS/2 mouse | JP13 |
| | | interface | |
|------------------+----------+----------------+-------------|
| Parallel port | CN2 | Power LED & | JP14/pins 1 |
| | | keylock | – 5 |
|------------------+----------+----------------+-------------|
| Serial port 2 | CN3 | Speaker | JP14/pins 7 |
| | | | - 10 |
|------------------+----------+----------------+-------------|
| Serial port 1 | CN4 | Reset switch | JP14/pins |
| | | | 12 & 13 |
|------------------+----------+----------------+-------------|
| IDE interface 2 | CN5 | Green PC | JP14/pins |
| | | connector | 15 & 16 |
|------------------+----------+----------------+-------------|
| IDE interface 1 | CN6 | Green PC LED | JP14/pins |
| | | | 18 & 19 |
|------------------+----------+----------------+-------------|
| Floppy drive | CN7 | Turbo LED | JP14/pins |
| interface | | | 20 & 21 |
|------------------+----------+----------------+-------------|
| IR connector | J4 | IDE interface | JP14/pins |
| | | LED | 23 & 24 |
|------------------+----------+----------------+-------------|
| Chassis fan | JP1 | 32-bit PCI | PC1 – PC4 |
| power | | slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|----------------------------------+-------+-----------------|
| » | Keyboard power on enabled | JP2 | Pins 1 & 2 |
| | | | closed |
|---+------------------------------+-------+-----------------|
| | Keyboard power on disabled | JP2 | Pins 2 & 3 |
| | | | closed |
|---+------------------------------+-------+-----------------|
| » | CMOS memory normal operation | JP8 | Pins 1 & 2 |
| | | | closed |
|---+------------------------------+-------+-----------------|
| | CMOS memory clear | JP8 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM/SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 8MB | None | None | (2) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | None | (1) 1M x 64 | None |
|------------+---------------+---------------+---------------|
| 16MB | None | None | (2) 2M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | None | (1) 2M x 64 | None |
|------------+---------------+---------------+---------------|
| 16MB | (1) 1M x 64 | None | (2) 1M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | (1) 1M x 64 | (1) 1M x 64 | None |
|------------+---------------+---------------+---------------|
| 32MB | None | None | (2) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | None | (1) 4M x 64 | None |
|------------+---------------+---------------+---------------|
| 32MB | (1) 2M x 64 | None | (2) 2M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | (1) 2M x 64 | (1) 2M x 64 | None |
|------------+---------------+---------------+---------------|
| 40MB | (1) 1M x 64 | None | (2) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (1) 4M x 64 | None | (2) 2M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (1) 2M x 64 | None | (2) 4M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | None | None | (2) 8M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | (1) 8M x 64 | None | None |
|------------+---------------+---------------+---------------|
| 64MB | (1) 4M x 64 | None | (2) 4M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | (1) 4M x 64 | (1) 4M x 64 | None |
|------------+---------------+---------------+---------------|
| 72MB | (1) 1M x 64 | None | (2) 8M x 36 |
|------------+---------------+---------------+---------------|
| 80MB | (1) 8M x 64 | None | (2) 2M x 36 |
|------------+---------------+---------------+---------------|
| 80MB | (1) 2M x 64 | None | (2) 8M x 36 |
|------------+---------------+---------------+---------------|
| 96MB | (1) 8M x 64 | None | (2) 4M x 36 |
|------------+---------------+---------------+---------------|
| 96MB | (1) 4M x 64 | None | (2) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM/SIMM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 128MB | (1) 8M x 64 | None | (2) 8M x 36 |
|------------+---------------+---------------+---------------|
| 128MB | (1) 8M x 64 | (1) 8M x 64 | None |
|------------+---------------+---------------+---------------|
| 128MB | None | None | (2) 16M x 36 |
|------------+---------------+---------------+---------------|
| 144MB | (1) 1M x 64 | (1) 1M x 64 | (2) 16M x 36 |
|------------+---------------+---------------+---------------|
| 160MB | (1) 2M x 64 | (1) 2M x 64 | (2) 16M x 36 |
|------------+---------------+---------------+---------------|
| 192MB | (1) 4M x 64 | (1) 4M x 64 | (2) 16M x 36 |
|------------+---------------+---------------+---------------|
| 256MB | (1) 8M x 64 | (1) 8M x 64 | (2) 16M x 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP7 |
|----------------------------+-------------------------------|
| » | 3.3v | Pins 1 & 2, 3 & 4 closed |
|---+------------------------+-------------------------------|
| | 5v | Pins 5 & 6, 7 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 512KB | (2) 64K x 32 | Unidentified |
|------------------------------------------------------------|
| Note: The location of the TAG is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CX 6X86) |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | JP4 |
|-----------+-------------+------------+---------------------|
| 133MHz | 66MHz | 2x | Pins 23 & 24 closed |
|-----------+-------------+------------+---------------------|
| 150MHz | 60MHz | 2x | Pins 5 & 6 closed |
|-----------+-------------+------------+---------------------|
| 166MHz | 66MHz | 2x | Pins 7 & 8 closed |
|-----------+-------------+------------+---------------------|
| 200MHz | 66MHz | 2x | Pins 25 & 26 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CX 6X86L) |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | JP4 |
|-----------+-------------+------------+---------------------|
| 133MHz | 66MHz | 2x | Pins 23 & 24 closed |
|-----------+-------------+------------+---------------------|
| 150MHz | 60MHz | 2x | Pins 5 & 6 closed |
|-----------+-------------+------------+---------------------|
| 166MHz | 66MHz | 2x | Pins 7 & 8 closed |
|-----------+-------------+------------+---------------------|
| 200MHz | 66MHz | 2x | Pins 25 & 26 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (IBM 6X86) |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | JP4 |
|-----------+-------------+------------+---------------------|
| 133MHz | 66MHz | 2x | Pins 23 & 24 closed |
|-----------+-------------+------------+---------------------|
| 150MHz | 60MHz | 2x | Pins 5 & 6 closed |
|-----------+-------------+------------+---------------------|
| 166MHz | 66MHz | 2x | Pins 7 & 8 closed |
|-----------+-------------+------------+---------------------|
| 200MHz | 66MHz | 2x | Pins 25 & 26 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (IBM 6X86L) |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | JP4 |
|-----------+-------------+------------+---------------------|
| 133MHz | 66MHz | 2x | Pins 23 & 24 closed |
|-----------+-------------+------------+---------------------|
| 150MHz | 60MHz | 2x | Pins 5 & 6 closed |
|-----------+-------------+------------+---------------------|
| 166MHz | 66MHz | 2x | Pins 7 & 8 closed |
|-----------+-------------+------------+---------------------|
| 200MHz | 66MHz | 2x | Pins 25 & 26 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CX 6X86MX) |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | JP4 |
|-----------+-------------+------------+---------------------|
| 166MHz | 66MHz | 2.5x | Pins 9 & 10 closed |
|-----------+-------------+------------+---------------------|
| 200MHz | 66MHz | 3x | Pins 11 & 12 closed |
|-----------+-------------+------------+---------------------|
| 233MHz | 66MHz | 4x | Pins 15 & 16 closed |
|-----------+-------------+------------+---------------------|
| 266MHz | 66MHz | 4.5x | Pins 19 & 20 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (IBM 6X86MX) |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | JP4 |
|-----------+-------------+------------+---------------------|
| 166MHz | 66MHz | 2.5x | Pins 9 & 10 closed |
|-----------+-------------+------------+---------------------|
| 200MHz | 66MHz | 3x | Pins 11 & 12 closed |
|-----------+-------------+------------+---------------------|
| 233MHz | 66MHz | 4x | Pins 15 & 16 closed |
|-----------+-------------+------------+---------------------|
| 266MHz | 66MHz | 4.5x | Pins 19 & 20 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AM K5/K6) |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | JP4 |
|-----------+-------------+------------+---------------------|
| 90MHz | 60MHz | 1.5x | Pins 1 & 2 closed |
|-----------+-------------+------------+---------------------|
| 100MHz | 66MHz | 1.5x | Pins 3 & 4 closed |
|-----------+-------------+------------+---------------------|
| 120MHz | 60MHz | 2x | Pins 5 & 6 closed |
|-----------+-------------+------------+---------------------|
| 133MHz | 66MHz | 2x | Pins 7 & 8 closed |
|-----------+-------------+------------+---------------------|
| 150MHz | 60MHz | 2.5x | Pins 9 & 10 closed |
|-----------+-------------+------------+---------------------|
| 166MHz | 66MHz | 2.5x | Pins 11 & 12 closed |
|-----------+-------------+------------+---------------------|
| 180MHz | 60MHz | 3x | Pins 13 & 14 closed |
|-----------+-------------+------------+---------------------|
| 200MHz | 66MHz | 3x | Pins 15 & 16 closed |
|-----------+-------------+------------+---------------------|
| 225MHz | 75MHz | 3.5x | Pins 17 & 18 closed |
|-----------+-------------+------------+---------------------|
| 233MHz | 66MHz | 4x | Pins 19 & 20 closed |
|-----------+-------------+------------+---------------------|
| 266MHz | 66MHz | 4.5x | Pins 21 & 22 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | JP4 |
|-----------+-------------+------------+---------------------|
| 90MHz | 60MHz | 1.5x | Pins 1 & 2 closed |
|-----------+-------------+------------+---------------------|
| 100MHz | 66MHz | 1.5x | Pins 3 & 4 closed |
|-----------+-------------+------------+---------------------|
| 120MHz | 60MHz | 2x | Pins 5 & 6 closed |
|-----------+-------------+------------+---------------------|
| 133MHz | 66MHz | 2x | Pins 7 & 8 closed |
|-----------+-------------+------------+---------------------|
| 150MHz | 60MHz | 2.5x | Pins 9 & 10 closed |
|-----------+-------------+------------+---------------------|
| 166MHz | 66MHz | 2.5x | Pins 11 & 12 closed |
|-----------+-------------+------------+---------------------|
| 180MHz | 60MHz | 3x | Pins 13 & 14 closed |
|-----------+-------------+------------+---------------------|
| 200MHz | 66MHz | 3x | Pins 15 & 16 closed |
|-----------+-------------+------------+---------------------|
| 225MHz | 75MHz | 3.5x | Pins 17 & 18 closed |
|-----------+-------------+------------+---------------------|
| 233MHz | 66MHz | 4x | Pins 19 & 20 closed |
|-----------+-------------+------------+---------------------|
| 266MHz | 66MHz | 4.5x | Pins 21 & 22 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | J18 |
|----------------------------+-------------------------------|
| » | 2.8v | Pins 1 & 5 closed |
|---+------------------------+-------------------------------|
| | 2.9v | Pins 2 & 6 closed |
|---+------------------------+-------------------------------|
| | 3.2v | Pins 3 & 7 closed |
|---+------------------------+-------------------------------|
| | 3.5v | Pins 4 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLASH BIOS SELECTION |
|------------------------------------------------------------|
| Setting | J9 | J10 |
|------------------+--------------------+--------------------|
| » | 5v | Pins 2 & 3 closed | Pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | 12v | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+