TEXT View Source
# EPOX COMPUTER CO., LTD.
P55-IT
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
IMG IMG 1
+------------------------------------------------------------+
| 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 |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | J23 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | On board I/O enabled | J24 | Open |
|---+---------------------------------+-------+--------------|
| | On board I/O disabled | J24 | Closed |
|---+---------------------------------+-------+--------------|
| | IDE 1 IRQ14 enabled | JP2 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | IDE 1 IRQ14 disabled | JP2 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | IDE 2 IRQ15 enabled | JP3 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | IDE 2 IRQ15 disabled | JP3 | Pins 2 & 3 |
| | | | 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 | Bank 1 | TAG |
|-----------+--------------+----------------+----------------|
| 256KB (A) | None | 256KB module | (1) 8K/16K/32K |
| | | installed | x 8 |
|-----------+--------------+----------------+----------------|
| 256KB (B) | (2) 32K x 32 | Not installed | (1) 8K/16K/32K |
| | | | x 8 |
|-----------+--------------+----------------+----------------|
| 512KB (A) | (2) 64K x 32 | Not installed | (1) 16K/32K x |
| | | | 8 |
|-----------+--------------+----------------+----------------|
| 512KB (B) | None | 512KB module | (1) 8K/16K/32K |
| | | installed | x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP10 |
|----------------------------+-------------------------------|
| 256KB (A) | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 256KB (B) | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 512KB (A) | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 512KB (B) | Pins 2 & 3 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 |
+------------------------------------------------------------+