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# EFA CORPORATION
P55TPIO
Processor Pentium
Processor 75/90/100/120/133/150/166MHz
Speed
Chip Set Intel
Max. Onboard 128MB
DRAM
Cache 256/512KB
BIOS Award
Dimensions 290mm x 220mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
green PC connector, IDE interfaces (2), parallel
port, serial ports (2), VRM connector, cache slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN1 | Power LED & | J11 |
| | | keylock | |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN2 | IDE interface | J12 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Parallel port | CN3 | Green PC | J13 |
| | | connector | |
|-------------------+----------+------------------+----------|
| Floppy drive | CN4 | Turbo LED | J14 |
| interface | | | |
|-------------------+----------+------------------+----------|
| IDE interface 1 | CN5 | Turbo switch | J15 |
|-------------------+----------+------------------+----------|
| IDE interface 2 | CN6 | Reset switch | J16 |
|-------------------+----------+------------------+----------|
| VRM connector | CN7 | 32-bit PCI slots | PC1 - |
| | | | PC4 |
|-------------------+----------+------------------+----------|
| Speaker | J10 | Cache slot | SL1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-----------------------------------+--------+---------------|
| » | Flash BIOS voltage select 5v | JP9 | pins 1 & 2 |
| | | | closed |
|---+-------------------------------+--------+---------------|
| | Flash BIOS voltage select 12v | JP9 | pins 2 & 3 |
| | | | closed |
|---+-------------------------------+--------+---------------|
| » | CMOS memory normal operation | JP19 | Open |
|---+-------------------------------+--------+---------------|
| | CMOS memory clear | JP19 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 36 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (2) 512K x 36 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (2) 512K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (2) 256K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (2) 512K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 10MB | (2) 256K x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 1M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 512K x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 36 | NONE |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 18MB | (2) 2M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 18MB | (2) 256K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 2M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 512K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 2M 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 |
|------------------+--------------------+--------------------|
| 34MB | (2) 4M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 34MB | (2) 256K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 4M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 512K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 1M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 4M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 2M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 36 | NONE |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 66MB | (2) 8M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 66MB | (2) 256K x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 8M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 512K x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 1M x 36 | (2) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 80MB | (2) 8M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 4M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
|------------------------------------------------------------|
| Note: Board will also accept non-parity chips. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG | SL1 |
|-------------+---------------+--------------+---------------|
| 256KB (A) | (8) 32K x 8 | (1) 32K x 8 | Not installed |
|-------------+---------------+--------------+---------------|
| 256KB (B) | NONE | NONE | Installed |
|-------------+---------------+--------------+---------------|
| 512KB (A) | (8) 64K x 8 | (1) 32K x 8 | Not installed |
|-------------+---------------+--------------+---------------|
| 512KB (B) | NONE | NONE | Installed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP10 | JP11 | JP12 | JP20 |
|-------+-----------+------------+------------+--------------|
| None | pins 1 & | pins 1 & 2 | pins 1 & 2 | Open |
| | 2 closed | closed | closed | |
|-------+-----------+------------+------------+--------------|
| 256KB | pins 2 & | pins 2 & 3 | pins 1 & 2 | pins 1 & 2, |
| (A) | 3 closed | closed | closed | 3 & 4 closed |
|-------+-----------+------------+------------+--------------|
| 256KB | Open | Open | Open | Open |
| (B) | | | | |
|-------+-----------+------------+------------+--------------|
| 512KB | pins 1 & | pins 1 & 2 | pins 2 & 3 | pins 1 & 2, |
| (A) | 2 closed | closed | closed | 3 & 4 closed |
|-------+-----------+------------+------------+--------------|
| 512KB | Open | Open | Open | Open |
| (B) | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP8 |
|----------------------------+-------------------------------|
| Mixed mode | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 3.3v | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP6 | JP7 | JP18 |
|-------+-----------------+-----------------+----------------|
| 50MHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 60MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 66MHz | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK RATIO CONFIGURATION |
|------------------------------------------------------------|
| Core/bus ratio | JP14 | JP15 |
|------------------+--------------------+--------------------|
| 1.5 | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 2 | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 2.5 | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 3 | pins 1 & 2 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP17 |
|----------------------------+-------------------------------|
| 3.3v | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 3.4v | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3.5v | pins 4 & 5 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VRM CONFIGURATION |
|------------------------------------------------------------|
| CPU type | CN7 |
|---------------+--------------------------------------------|
| P54C | pins 4 & 5, 6 & 7, 19 & 20, 21 & 22 closed |
|---------------+--------------------------------------------|
| P55C | VRM installed |
|------------------------------------------------------------|
| Note: Pin 1 is shown for clarification purposes only. |
+------------------------------------------------------------+