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# EPOX COMPUTER CO., LTD.
P55-TX
Processor CX 6X86/AM K5/AM K6/Pentium
Processor Speed 90/100/120/133/150/166/180/200/225/233MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 256MB (EDO supported)
Memory
Maximum Video None
Memory
Cache 512KB
BIOS Award
Dimensions 305mm x 244mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
green PC connector, IDE interfaces (2),
parallel port, PS/2 mouse port, serial ports
(2), IR connector, USB connector, ATX power
connector
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+----------------+-------------|
| ATX power | ATX | Chassis fan | JP1 |
| connector | | power | |
|------------------+----------+----------------+-------------|
| USB connector | CN1 | Soft off power | JP9 |
| | | supply | |
|------------------+----------+----------------+-------------|
| Serial port 2 | CN2 | Power LED & | JP14/pins 1 |
| | | keylock | – 5 |
|------------------+----------+----------------+-------------|
| Parallel port | CN3 | Speaker | JP14/pins 7 |
| | | | - 10 |
|------------------+----------+----------------+-------------|
| PS/2 mouse port | CN4 | Reset switch | JP14/pins |
| | | | 12 & 13 |
|------------------+----------+----------------+-------------|
| Serial port 1 | CN5 | Green PC | JP14/pins |
| | | connector | 15 & 16 |
|------------------+----------+----------------+-------------|
| IR connector | J4 | Green PC LED | JP14/pins |
| | | | 18 & 19 |
|------------------+----------+----------------+-------------|
| IDE interface 1 | J5 | Turbo LED | JP14/pins |
| | | | 20 & 21 |
|------------------+----------+----------------+-------------|
| IDE interface 2 | J6 | IDE interface | JP14/pins |
| | | LED | 23 & 24 |
|------------------+----------+----------------+-------------|
| Floppy drive | J7 | 32-bit PCI bus | PC1 – PC4 |
| interface | | 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 |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP6 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | JP8 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | JP8 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 128MB | (2) 16M x 36 | None |
|------------------+--------------------+--------------------|
| 136MB | (2) 16M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 144MB | (2) 16M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 160MB | (2) 16M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 192MB | (2) 16M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 256MB | (2) 16M x 36 | (2) 16M x 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 64 | None |
|------------------+--------------------+--------------------|
| 16MB | (1) 2M x 64 | None |
|------------------+--------------------+--------------------|
| 16MB | (1) 1M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 24MB | (1) 2M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 64 | None |
|------------------+--------------------+--------------------|
| 32MB | (1) 2M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 40MB | (1) 4M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 48MB | (1) 4M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 64MB | (1) 8M x 64 | None |
|------------------+--------------------+--------------------|
| 64MB | (1) 4M x 64 | (1) 4M x 64 |
|------------------+--------------------+--------------------|
| 72MB | (1) 8M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 80MB | (1) 8M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 96MB | (1) 8M x 64 | (1) 4M x 64 |
|------------------+--------------------+--------------------|
| 128MB | (1) 8M x 64 | (1) 8M x 64 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM/SIMM VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP7A | JP7B |
|------------------+--------------------+--------------------|
| » | 3.3v | Pins 2 & 3 closed | Pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | 5v | Pins 1 & 2 closed | Pins 1 & 2 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 (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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (SINGLE) |
|------------------------------------------------------------|
| Voltage | J16 |
|----------------------------+-------------------------------|
| | 3.3v | Pins 1 & 2 closed |
|----+-----------------------+-------------------------------|
| | 3.45v | Pins 2 & 3 closed |
|----+-----------------------+-------------------------------|
| » | 3.52v | Pins 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (DUAL) |
|------------------------------------------------------------|
| Voltage | V core | J16 | J18 |
|-----------+--------+-------------------+-------------------|
| | 3.3v | 2.5v | Pins 1 & 2 closed | Pins 1 & 2 closed |
|---+-------+--------+-------------------+-------------------|
| | 3.3v | 2.8v | Pins 1 & 2 closed | Pins 2 & 3 closed |
|---+-------+--------+-------------------+-------------------|
| | 3.3v | 2.9v | Pins 1 & 2 closed | Open |
|---+-------+--------+-------------------+-------------------|
| | 3.45v | 2.5v | Pins 2 & 3 closed | Pins 1 & 2 closed |
|---+-------+--------+-------------------+-------------------|
| | 3.45v | 2.8v | Pins 2 & 3 closed | Pins 2 & 3 closed |
|---+-------+--------+-------------------+-------------------|
| | 3.45v | 2.9v | Pins 2 & 3 closed | Open |
|---+-------+--------+-------------------+-------------------|
| | 3.52v | 2.5v | Pins 3 & 4 closed | Pins 1 & 2 closed |
|---+-------+--------+-------------------+-------------------|
| » | 3.52v | 2.8v | Pins 3 & 4 closed | Pins 2 & 3 closed |
|---+-------+--------+-------------------+-------------------|
| | 3.52v | 2.9v | Pins 3 & 4 closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLASH BIOS SELECTION |
|------------------------------------------------------------|
| Setting | J9 | J10 |
|------------------+--------------------+--------------------|
| » | 5v | Pins 2 & 3 closed | Pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | 12v | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+