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# UNIDENTIFIED
P55-TH
Processor CX M1/Pentium
Processor Speed 75/90/100/120/133/150/166/180/200MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 512MB (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 interface, serial
ports (2), cache slot, IR connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN1 | Green PC LED | J6 |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN2 | Chassis fan | J7 |
| | | power | |
|-------------------+----------+------------------+----------|
| Parallel port | CN3 | PS/2 mouse | J10 |
| | | interface | |
|-------------------+----------+------------------+----------|
| Floppy drive | CN4 | IR connector | J33 |
| interface | | | |
|-------------------+----------+------------------+----------|
| IDE interface 2 | CN5 | Turbo switch | J44 |
|-------------------+----------+------------------+----------|
| IDE interface 1 | CN6 | IDE interface | JP5 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Power LED & | J1 | Green PC | JP14 |
| keylock | | connector | |
|-------------------+----------+------------------+----------|
| Speaker | J2 | 32-bit PCI slots | PC1 - |
| | | | PC4 |
|-------------------+----------+------------------+----------|
| Reset switch | J3 | Cache slot | SL1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|------------------------------------+-------+---------------|
| » | SMC chip enabled | J24 | Open |
|---+--------------------------------+-------+---------------|
| | SMC chip disabled | J24 | Closed |
|---+--------------------------------+-------+---------------|
| | Flash BIOS voltage select 12v | JP6 | Pins 2 & 3 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Flash BIOS voltage select 5v | JP6 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| » | Flash BIOS normal operation | JP8 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Flash BIOS boot block enabled | JP8 | 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|----------------+---------------------+---------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|----------------+---------------------+---------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
|----------------+---------------------+---------------------|
| 256MB | (2) 16M x 36 | (2) 16M x 36 |
|----------------+---------------------+---------------------|
| 512MB | (2) 32M x 36 | (2) 32M 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 | Unidentified | None |
|-----------+--------------+--------------+------------------|
| 256KB (B) | None | Unidentified | 256KB module |
| | | | installed |
|-----------+--------------+--------------+------------------|
| 512KB (A) | (2) 32K x 32 | Unidentified | 256KB module |
| | | | installed |
|-----------+--------------+--------------+------------------|
| 512KB (B) | (2) 64K x 32 | Unidentified | None |
|-----------+--------------+--------------+------------------|
| 512KB (C) | None | Unidentified | 512KB module |
| | | | installed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP10 | JP11 |
|------------------+--------------------+--------------------|
| 256KB (A) | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 256KB (B) | Pins 1 & 2 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 512KB (A) | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 512KB (B) | Pins 2 & 3 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 512KB (C) | Pins 1 & 2 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CYRIX) |
|------------------------------------------------------------|
| CPU speed | Clock speed | JP1 |
|------------------+-------------------+---------------------|
| 100MHz | 66MHz | Pins 10 & 23 closed |
|------------------+-------------------+---------------------|
| 120MHz | 60MHz | Pins 4 & 17 closed |
|------------------+-------------------+---------------------|
| 133MHz | 66MHz | Pins 5 & 18 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU speed | Clock speed | JP1 |
|------------------+--------------------+--------------------|
| 75MHz | 50MHz | Pins 1 & 14 closed |
|------------------+--------------------+--------------------|
| 90MHz | 60MHz | Pins 2 & 15 closed |
|------------------+--------------------+--------------------|
| 100MHz | 66MHz | Pins 3 & 16 closed |
|------------------+--------------------+--------------------|
| 120MHz | 60MHz | Pins 4 & 17 closed |
|------------------+--------------------+--------------------|
| 133MHz | 66MHz | Pins 5 & 18 closed |
|------------------+--------------------+--------------------|
| 150MHz | 60MHz | Pins 6 & 19 closed |
|------------------+--------------------+--------------------|
| 166MHz | 66MHz | Pins 7 & 20 closed |
|------------------+--------------------+--------------------|
| 180MHz | 60MHz | Pins 8 & 21 closed |
|------------------+--------------------+--------------------|
| 200MHz | 66MHz | Pins 9 & 22 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP3A | JP3B | JP3C | JP3D |
|-------------------------+--------+--------+--------+-------|
| CX M1 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|-------------------------+--------+--------+--------+-------|
| P54C/P54CS/P54CT/P54CTB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|-------------------------+--------+--------+--------+-------|
| P55C | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU AT BUS CLOCK SELECTION |
|------------------------------------------------------------|
| Setting | J25 |
|----------------------------+-------------------------------|
| PCICLK/4 | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| PCICLK/3 | Pins 1 & 2 closed |
+------------------------------------------------------------+