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# UNIDENTIFIED
P55-ET
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 |
|------------------------------------+-------+---------------|
| » | SMC chip enabled | J24 | Open |
|---+--------------------------------+-------+---------------|
| | SMC chip disabled | J24 | Closed |
|---+--------------------------------+-------+---------------|
| » | Flash BIOS voltage select 5v | JP6 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Flash BIOS voltage select 12v | JP6 | Pins 2 & 3 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Jumper information unavailable | JP12 | Unidentified |
|---+--------------------------------+-------+---------------|
| » | Clock rate set as AT CLOCK | JP15 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Clock rate set as 12MHz | JP15 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|---------------+-----------------------+--------------------|
| 8MB | (2) 1M x 36 | None |
|---------------+-----------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|---------------+-----------------------+--------------------|
| 16MB | (2) 2M x 36 | None |
|---------------+-----------------------+--------------------|
| 24MB | (2) 1M x 36 | (2) 2M x 36 |
|---------------+-----------------------+--------------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 |
|---------------+-----------------------+--------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|---------------+-----------------------+--------------------|
| 32MB | (2) 4M x 36 | None |
|---------------+-----------------------+--------------------|
| 40MB | (2) 1M x 36 | (2) 4M x 36 |
|---------------+-----------------------+--------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|---------------+-----------------------+--------------------|
| 48MB | (2) 2M x 36 | (2) 4M x 36 |
|---------------+-----------------------+--------------------|
| 48MB | (2) 4M x 36 | (2) 2M x 36 |
|---------------+-----------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|---------------+-----------------------+--------------------|
| 64MB | (2) 8M x 36 | None |
|---------------+-----------------------+--------------------|
| 72MB | (2) 1M x 36 | (2) 8M x 36 |
|---------------+-----------------------+--------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
|---------------+-----------------------+--------------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 |
|---------------+-----------------------+--------------------|
| 80MB | (2) 8M x 36 | (2) 2M x 36 |
|---------------+-----------------------+--------------------|
| 96MB | (2) 4M 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG | SL1 |
|------------+--------------+---------------+----------------|
| 256KB (A) | (2) 32K x 32 | None | 256KB module |
| | | | installed |
|------------+--------------+---------------+----------------|
| 256KB (B) | (2) 32K x 32 | (1) 8K/16K x | Not installed |
| | | 8 | |
|------------+--------------+---------------+----------------|
| 512KB (A) | (2) 64K x 32 | (1) 16K/32K x | Not installed |
| | | 8 | |
|------------+--------------+---------------+----------------|
| 512KB (B) | (2) 32K x 32 | (1) 16K/32K x | 256KB module |
| | | 8 | installed |
|------------------------------------------------------------|
| Note: If 256KB (A) configuration is used, see jumper |
| setting for TP1 below. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP10 | JP11 |
|------------------+--------------------+--------------------|
| 256KB (B) | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 512KB (A) | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 512KB (B) | Pins 2 & 3 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | TP1 |
|----------------------------+-------------------------------|
| Bank 0 enabled | Open |
|----------------------------+-------------------------------|
| Bank 0 disabled | Pins 1 & 2, 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| CPU | Clock |Multiplier| J25 | JP7 | JP9 | JPS1 | JPS2 |
| speed | 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/P54CS | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| P55C/P55CT | Pins 2 & 3 closed |
+------------------------------------------------------------+
(IMG) IMG 2
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (ESCM CACHE MODULE) |
|------------------------------------------------------------|
| Size | JP1 |
|--------------------------+---------------------------------|
| 256KB | Pins 1 & 2, 5 & 6 closed |
|--------------------------+---------------------------------|
| 512KB | Pins 2 & 3, 4 & 5 closed |
+------------------------------------------------------------+