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# EPOX COMPUTER CO., LTD.
P55-VX
Processor CX M1/AM K5/Pentium
Processor Speed 75/90/100/120/133/150/166/180/200MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 128MB (EDO supported)
Memory
Maximum Video None
Memory
Cache 256/512KB
BIOS Award
Dimensions 225mm x 220mm
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, USB connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+------------------+-----------|
| Serial port 2 | CN1 | Chassis fan | J3 |
| | | power | |
|------------------+----------+------------------+-----------|
| Serial port 1 | CN2 | Power LED & | J4 pins 1 |
| | | keylock | - 5 |
|------------------+----------+------------------+-----------|
| Parallel port | CN3 | Speaker | J4 pins 7 |
| | | | - 10 |
|------------------+----------+------------------+-----------|
| Floppy drive | CN4 | Reset switch | J4 pins |
| interface | | | 12 & 13 |
|------------------+----------+------------------+-----------|
| IDE interface 2 | CN5 | Turbo LED | J4 pins |
| | | | 15 & 16 |
|------------------+----------+------------------+-----------|
| IDE interface 1 | CN6 | Green PC | J4 pins |
| | | connector | 18 & 19 |
|------------------+----------+------------------+-----------|
| USB connector | CN8 | Green PC LED | J4 pins |
| | | | 21 & 22 |
|------------------+----------+------------------+-----------|
| PS/2 mouse | J1 | IDE interface | J4 pins |
| interface | | LED | 24 & 25 |
|------------------+----------+------------------+-----------|
| IR connector | J2 | 32-bit PCI slots | PC1 - PC4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-----------------------------------+-------+----------------|
| | Flash BIOS voltage select 12v | JP2 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | Flash BIOS voltage select 5v | JP2 | Pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM 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) 1M x 36 | (2) 2M x 36 |
|---------------+-----------------------+--------------------|
| 32MB | (2) 4M x 36 | None |
|---------------+-----------------------+--------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|---------------+-----------------------+--------------------|
| 40MB | (2) 1M x 36 | (2) 4M 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) 2M 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. Banks are interchangeable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 256KB | (2) 32K x 32 | (1) 8K/16K/32K x 8 |
|------------------+--------------------+--------------------|
| 512KB | (2) 64K x 32 | (1) 16K/32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CYRIX) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JP7 | JP8 | JP9 | JP10 |
| speed | speed | | | | | |
|--------+-------+------------+--------+--------+-----+------|
| 120MHz | 50MHz | 2x | Closed | Closed | 1 & | 2 & |
| | | | | | 2 | 3 |
|--------+-------+------------+--------+--------+-----+------|
| 133MHz | 55MHz | 2x | Open | Open | 1 & | 2 & |
| | | | | | 2 | 3 |
|--------+-------+------------+--------+--------+-----+------|
| 150MHz | 60MHz | 2x | Open | Closed | 1 & | 2 & |
| | | | | | 2 | 3 |
|--------+-------+------------+--------+--------+-----+------|
| 166MHz | 66MHz | 2x | Closed | Open | 1 & | 2 & |
| | | | | | 2 | 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JP7 | JP8 | JP9 | JP10 |
| speed | speed | | | | | |
|--------+-------+------------+--------+--------+-----+------|
| 75MHz | 50MHz | 1.5x | Closed | Closed | 1 & | 1 & |
| | | | | | 2 | 2 |
|--------+-------+------------+--------+--------+-----+------|
| 90MHz | 60MHz | 1.5x | Open | Closed | 1 & | 1 & |
| | | | | | 2 | 2 |
|--------+-------+------------+--------+--------+-----+------|
| 100MHz | 66MHz | 1.5x | Closed | Open | 1 & | 1 & |
| | | | | | 2 | 2 |
|--------+-------+------------+--------+--------+-----+------|
| 120MHz | 60MHz | 2x | Open | Closed | 1 & | 2 & |
| | | | | | 2 | 3 |
|--------+-------+------------+--------+--------+-----+------|
| 133MHz | 66MHz | 2x | Closed | Open | 1 & | 2 & |
| | | | | | 2 | 3 |
|--------+-------+------------+--------+--------+-----+------|
| 150MHz | 60MHz | 2.5x | Open | Closed | 2 & | 2 & |
| | | | | | 3 | 3 |
|--------+-------+------------+--------+--------+-----+------|
| 166MHz | 66MHz | 2.5x | Closed | Open | 2 & | 2 & |
| | | | | | 3 | 3 |
|--------+-------+------------+--------+--------+-----+------|
| 180MHz | 60MHz | 3x | Open | Closed | 2 & | 1 & |
| | | | | | 3 | 2 |
|--------+-------+------------+--------+--------+-----+------|
| 200MHz | 66MHz | 3x | Closed | Open | 2 & | 1 & |
| | | | | | 3 | 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP5A | JP5B | JP5C |
|----------+----------------+----------------+---------------|
| CX M1 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| AM K5 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| P54C/CTB | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| P55C | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP4 |
|----------------------------+-------------------------------|
| 2.5v | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 2.8v | Pins 2 & 3 closed |
+------------------------------------------------------------+