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# EPOX COMPUTER CO., LTD.
P55-VA
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 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, serial ports
(2), cache slot, IR connector, USB connector,
ATX power connector
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+------------------+-----------|
| ATX power | ATX | Power on | J3 |
| connector | | connector | |
|------------------+----------+------------------+-----------|
| PS/2 mouse port | CN1 | Power LED & | J4 pins 1 |
| | | keylock | - 5 |
|------------------+----------+------------------+-----------|
| Serial port 1 | CN3 | Speaker | J4 pins 7 |
| | | | - 10 |
|------------------+----------+------------------+-----------|
| Parallel port | CN4 | Reset switch | J4 pins |
| | | | 12 & 13 |
|------------------+----------+------------------+-----------|
| Serial port 2 | CN5 | Turbo LED | J4 pins |
| | | | 15 & 16 |
|------------------+----------+------------------+-----------|
| USB connector | CN6 | Green PC | J4 pins |
| | | connector | 18 & 19 |
|------------------+----------+------------------+-----------|
| Floppy drive | CN7 | Green PC LED | J4 pins |
| interface | | | 21 & 22 |
|------------------+----------+------------------+-----------|
| IDE interface 1 | CN8 | IDE interface | J4 pins |
| | | LED | 24 & 25 |
|------------------+----------+------------------+-----------|
| IDE interface 2 | CN9 | 32-bit PCI slots | PC1 - PC4 |
|------------------+----------+------------------+-----------|
| Chassis fan | J1 | Cache slot | SL1 |
| power | | | |
|------------------+----------+------------------+-----------|
| IR connector | J2 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-----------------------------------+-------+----------------|
| | Flash BIOS voltage select 12v | JP1 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | Flash BIOS voltage select 5v | JP1 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| » | CMOS memory normal operation | JP5 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | CMOS memory clear | JP5 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 8MB | (2) 1M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 8MB | None | None | (1) 1M x | None |
| | | | 64 | |
|------+-------------+-------------+------------+------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (2) 2M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (2) 1M x 36 | None | (1) 1M x | None |
| | | | 64 | |
|------+-------------+-------------+------------+------------|
| 16MB | None | None | (1) 2M x | None |
| | | | 64 | |
|------+-------------+-------------+------------+------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 24MB | (2) 1M x 36 | None | (1) 2M x | None |
| | | | 64 | |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 4M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 2M x 36 | None | (1) 2M x | None |
| | | | 64 | |
|------+-------------+-------------+------------+------------|
| 32MB | None | None | (1) 4M x | None |
| | | | 64 | |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 1M x 36 | (2) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 64 | 64 |
|------+-------------+-------------+------------+------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 40MB | (2) 4M x 36 | None | (1) 1M x | None |
| | | | 64 | |
|------+-------------+-------------+------------+------------|
| 48MB | (2) 2M x 36 | (2) 4M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 48MB | (2) 2M x 36 | None | (1) 4M x | None |
| | | | 64 | |
|------+-------------+-------------+------------+------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 64MB | (2) 8M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 64MB | (2) 4M x 36 | None | (1) 4M x | None |
| | | | 64 | |
|------+-------------+-------------+------------+------------|
| 64MB | None | None | (1) 8M x | None |
| | | | 64 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 72MB | (2) 1M x 36 | (2) 8M x | None | None |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 72MB | (2) 1M x 36 | None | (1) 8M x | None |
| | | | 64 | |
|-------+-------------+------------+------------+------------|
| 72MB | (2) 2M x 36 | (2) 2M x | (1) 1M x | (1) 4M x |
| | | 36 | 64 | 64 |
|-------+-------------+------------+------------+------------|
| 80MB | (2) 2M x 36 | (2) 8M x | None | None |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 80MB | (2) 2M x 36 | None | (1) 8M x | None |
| | | | 64 | |
|-------+-------------+------------+------------+------------|
| 80MB | (2) 4M x 36 | (2) 4M x | (1) 1M x | (1) 1M x |
| | | 36 | 64 | 64 |
|-------+-------------+------------+------------+------------|
| 96MB | (2) 4M x 36 | (2) 8M x | None | None |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 96MB | (2) 4M x 36 | None | (1) 8M x | None |
| | | | 64 | |
|-------+-------------+------------+------------+------------|
| 96MB | (2) 2M x 36 | (2) 2M x | (1) 4M x | (1) 4M x |
| | | 36 | 64 | 64 |
|-------+-------------+------------+------------+------------|
| 104MB | (2) 4M x 36 | (2) 4M x | (1) 1M x | (1) 4M x |
| | | 36 | 64 | 64 |
|-------+-------------+------------+------------+------------|
| 128MB | (2) 8M x 36 | (2) 8M x | None | None |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 128MB | (2) 8M x 36 | None | (1) 8M x | None |
| | | | 64 | |
|-------+-------------+------------+------------+------------|
| 128MB | (2) 4M x 36 | (2) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 64 | 64 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. Banks are interchangeable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | SL1 | TAG |
|------------+---------------+---------------+---------------|
| 256KB | (2) 32K x 32 | Not installed | Unidentified |
|------------+---------------+---------------+---------------|
| 512KB | (2) 32K x 32 | Installed | Unidentified |
|------------+---------------+---------------+---------------|
| 512KB | (2) 64K x 32 | Not installed | Unidentified |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CYRIX) |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | JP8 |
|-----------+-------------+------------+---------------------|
| 120MHz | 50MHz | 2x | Pins 10 & 23 closed |
|-----------+-------------+------------+---------------------|
| 133MHz | 55MHz | 2x | Pins 13 & 26 closed |
|-----------+-------------+------------+---------------------|
| 150MHz | 60MHz | 2x | Pins 4 & 17 closed |
|-----------+-------------+------------+---------------------|
| 166MHz | 66MHz | 2x | Pins 5 & 18 closed |
|-----------+-------------+------------+---------------------|
| 200MHz | 75MHz | 2x | Pins 12 & 25 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | JP8 |
|------------+-------------+------------+--------------------|
| 75MHz | 50MHz | 1.5x | Pins 1 & 14 closed |
|------------+-------------+------------+--------------------|
| 90MHz | 60MHz | 1.5x | Pins 2 & 15 closed |
|------------+-------------+------------+--------------------|
| 100MHz | 66MHz | 1.5x | Pins 3 & 16 closed |
|------------+-------------+------------+--------------------|
| 120MHz | 60MHz | 2x | Pins 4 & 17 closed |
|------------+-------------+------------+--------------------|
| 133MHz | 66MHz | 2x | Pins 5 & 18 closed |
|------------+-------------+------------+--------------------|
| 150MHz | 60MHz | 2.5x | Pins 6 & 19 closed |
|------------+-------------+------------+--------------------|
| 166MHz | 66MHz | 2.5x | Pins 7 & 20 closed |
|------------+-------------+------------+--------------------|
| 180MHz | 60MHz | 3x | Pins 8 & 21 closed |
|------------+-------------+------------+--------------------|
| 200MHz | 66MHz | 3x | Pins 9 & 22 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP3A | JP3B | JP3C |
|----------+----------------+----------------+---------------|
| 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 |
|---+------------------------+-------------------------------|
| | 2.9v | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| If 200MHz Cyrix chip is installed, do not install the |
| COAST module. Also, do not install a PCI 2.0 SCSI |
| card. Either of the above cases will cause the |
| mainboard to lock up. A PCI 2.1 SCSI card may be |
| installed with no problems. |
+------------------------------------------------------------+