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# EFA CORPORATION
P55T2PIO (REV. 2.0), P55T2SPIO (REV. 2.0)
Processor CX M1/AM K5/Pentium
Processor Speed 75/90/100/110/120/133/150/166/200MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 512MB
Memory
Maximum Video None
Memory
Cache 256/512KB
BIOS Award
Dimensions 280mm 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), USB connectors (2), IR connector,
audio bus slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| PS/2 mouse | J2 | Parallel port | J18 |
| interface | | | |
|-------------------+----------+------------------+----------|
| External battery | J3 | Serial port 1 | J20 |
|-------------------+----------+------------------+----------|
| IR connector | J7 | Serial port 2 | J21 |
|-------------------+----------+------------------+----------|
| IDE interface LED | J8 | Floppy drive | J22 |
| | | interface | |
|-------------------+----------+------------------+----------|
| Green PC | J10 | USB connector | J23 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Reset switch | J11 | USB connector | J24 |
|-------------------+----------+------------------+----------|
| Speaker | J13 | IDE interface 1 | J25 |
|-------------------+----------+------------------+----------|
| Turbo LED | J15 | IDE interface 2 | J26 |
|-------------------+----------+------------------+----------|
| Turbo switch | J16 | 32-bit PCI slots | PC1 - |
| | | | PC4 |
|-------------------+----------+------------------+----------|
| Power LED & | J17 | Audio bus slot | SL1 |
| keylock | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|------------------------------------+-------+---------------|
| » | Monitor type select color | JP12 | Open |
|---+--------------------------------+-------+---------------|
| | Monitor type select monochrome | JP12 | Closed |
|---+--------------------------------+-------+---------------|
| » | CMOS memory normal operation | JP13 | Open |
|---+--------------------------------+-------+---------------|
| | CMOS memory clear | JP13 | Closed |
|---+--------------------------------+-------+---------------|
| | DRAM refresh rate select 66MHz | JP14 | Open |
|---+--------------------------------+-------+---------------|
| | DRAM refresh rate select 60MHz | JP14 | Closed |
|---+--------------------------------+-------+---------------|
| | Flash BIOS normal operation | JP17 | Pins 2 & 3 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Flash BIOS recovery mode | JP17 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Sound interface enabled | JP18 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Sound interface disabled | JP18 | Pins 2 & 3 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| » | Flash BIOS voltage select 5v | JP19 | Pins 2 & 3 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Flash BIOS voltage select 12v | JP19 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| » | BIOS type select 1MB EEPROM | JP21 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | BIOS type select 2MB EEPROM | JP21 | Pins 2 & 3 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| » | PS/2 mouse IRQ12 enabled | JP24 | Closed |
|---+--------------------------------+-------+---------------|
| | PS/2 mouse IRQ12 disabled | JP24 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 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 |
|------------------+--------------------+--------------------|
| 256MB | (2) 32M x 36 | None |
|------------------+--------------------+--------------------|
| 264MB | (2) 32M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 272MB | (2) 32M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 288MB | (2) 32M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 320MB | (2) 32M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 384MB | (2) 32M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 512MB | (2) 32M x 36 | (2) 32M x 36 |
|------------------------------------------------------------|
| Note: Board also accepts x 32 SIMMs. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|----------+---------------+---------------+-----------------|
| 256KB | (2) 32K x 32 | None | (1) 16K/32K x 8 |
|----------+---------------+---------------+-----------------|
| 512KB | (2) 32K x 32 | (2) 32K x 32 | (1) 16K/32K x 8 |
|------------------------------------------------------------|
| Note: The location of banks 0 & 1 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TAG CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 |
|-----------------------------+------------------------------|
| Aster 16K x 8 | Pins 1 & 2 closed |
|-----------------------------+------------------------------|
| Winbond 16K x 8 | Open |
|-----------------------------+------------------------------|
| 32K x 8 | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP7 |
|-------------------------------+----------------------------|
| Write through | Closed |
|-------------------------------+----------------------------|
| Write back | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CYRIX) |
|------------------------------------------------------------|
| CPU | Clock |Multiplier| JP5 | JP6 | JP11 |JP15 |JP16 |
| speed | speed | | | | | | |
|-------+--------+----------+------+------+------+-----+-----|
|100MHz | 50MHz | 2x |Closed|Closed| Open |1 & 2|2 & 3|
|-------+--------+----------+------+------+------+-----+-----|
|110MHz | 55MHz | 2x | Open | Open | Open |1 & 2|2 & 3|
|-------+--------+----------+------+------+------+-----+-----|
|120MHz | 60MHz | 2x | Open |Closed|Closed|1 & 2|2 & 3|
|-------+--------+----------+------+------+------+-----+-----|
|133MHz | 66MHz | 2x |Closed| Open |Closed|1 & 2|2 & 3|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AMD/INTEL) |
|------------------------------------------------------------|
| CPU | Clock |Multiplier| JP5 | JP6 | JP11 |JP15 |JP16 |
| speed | speed | | | | | | |
|-------+--------+----------+------+------+------+-----+-----|
| 75MHz | 50MHz | 1.5x |Closed|Closed| Open |2 & 3|2 & 3|
|-------+--------+----------+------+------+------+-----+-----|
| 90MHz | 60MHz | 1.5x | Open |Closed|Closed|2 & 3|2 & 3|
|-------+--------+----------+------+------+------+-----+-----|
|100MHz | 66MHz | 1.5x |Closed| Open |Closed|2 & 3|2 & 3|
|-------+--------+----------+------+------+------+-----+-----|
|120MHz | 60MHz | 2x | Open |Closed|Closed|1 & 2|2 & 3|
|-------+--------+----------+------+------+------+-----+-----|
|133MHz | 66MHz | 2x |Closed| Open |Closed|1 & 2|2 & 3|
|-------+--------+----------+------+------+------+-----+-----|
|150MHz | 60MHz | 2.5x | Open |Closed|Closed|1 & 2|1 & 2|
|-------+--------+----------+------+------+------+-----+-----|
|166MHz | 66MHz | 2.5x |Closed| Open |Closed|1 & 2|1 & 2|
|-------+--------+----------+------+------+------+-----+-----|
|200MHz | 66MHz | 3x |Closed| Open |Closed|2 & 3|1 & 2|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP8 | JP10 |
|-------------+-------------------+--------------------------|
| P54C (3.4v) | Pins 2 & 3 closed | Pins 1 & 3, 2 & 4 closed |
|-------------+-------------------+--------------------------|
| P55C (2.5v) | Pins 1 & 2 closed | Pins 3 & 5, 4 & 6 closed |
|-------------+-------------------+--------------------------|
| P55C (2.8v) | Pins 4 & 5 closed | Pins 3 & 5, 4 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP3 |
|----------------------------+-------------------------------|
| 3.3v (STD) | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 3.4v (VR) | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3.5v (VRE) | Pins 4 & 5 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MULTI I/O SELECTION |
|------------------------------------------------------------|
| Setting | JP4 | JP9 |
|------------------+--------------------+--------------------|
| Enabled | Pins 2 & 3 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| Disabled | Pins 1 & 2 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+