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# ASUS COMPUTER INTERNATIONAL
P/I-P55SP4
Processor Pentium
Processor 75/90/100/120/133/150/166MHz
Speed
Chip Set SIS
Max. Onboard 512MB
DRAM
Cache 256/512/1024KB
BIOS Award
Dimensions 330mm x 218mm
I/O Options Parallel port, serial ports (2), 32-bit PCI slots
(4), green PC connector, floppy drive interface,
IDE interfaces (2), cache slot, MediaBus slot,
infrared connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+------------------+-----------|
| PS/2 mouse | CN1 | Green PC | J1 pins |
| interface | | connector | 14 & 15 |
|------------------+----------+------------------+-----------|
| Serial port 2 | CN2 | Turbo switch | J1 pins |
| | | | 16 & 17 |
|------------------+----------+------------------+-----------|
| Serial port 1 | CN3 | Reset switch | J1 pins |
| | | | 19 & 20 |
|------------------+----------+------------------+-----------|
| Parallel port | CN4 | Green PC | JP1 |
| | | connector | |
|------------------+----------+------------------+-----------|
| Floppy drive | CN5 | Chassis fan | JP26 |
| interface | | power | |
|------------------+----------+------------------+-----------|
| IDE interface 1 | CN6 | IDE interface | JP27 |
| | | LED | |
|------------------+----------+------------------+-----------|
| IDE interface 2 | CN7 | Infrared | JP31 |
| | | connector | |
|------------------+----------+------------------+-----------|
| Power LED & | J1 pins | 32-bit PCI slots | PC1 - PC4 |
| keylock | 1 - 5 | | |
|------------------+----------+------------------+-----------|
| Speaker | J1 pins | MediaBus slot | SL1 |
| | 7 - 10 | | |
|------------------+----------+------------------+-----------|
| Turbo LED | J1 pins | Cache slot | SL2 |
| | 12 & 13 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | PS/2 mouse port disabled | JP5 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | PS/2 mouse port enabled | JP5 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Flash BIOS boot block protected | JP16 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Flash BIOS boot block | JP16 | pins 2 & 3 |
| | programming enabled | | closed |
|---+----------------------------------+--------+------------|
| » | On board I/O enabled | JP1C | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | On board I/O disabled | JP1C | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 36 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 4MB | (2) 512K x 36 | NONE |
|------------------+--------------------+--------------------|
| 6MB | (2) 256K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (2) 512K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 512K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 10MB | (2) 256K x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 512K x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 1M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 36 | NONE |
|------------------+--------------------+--------------------|
| 18MB | (2) 256K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 18MB | (2) 2M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 512K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 2M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 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 |
|------------------+--------------------+--------------------|
| 34MB | (2) 256K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 34MB | (2) 4M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 512K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 4M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 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 |
|------------------+--------------------+--------------------|
| 66MB | (2) 256K x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 66MB | (2) 8M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 512K x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 8M x 36 | (2) 512K x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 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 |
|------------------+--------------------+--------------------|
| 128MB | (2) 16M x 36 | NONE |
|------------------+--------------------+--------------------|
| 130MB | (2) 256K x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 130MB | (2) 16M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 132MB | (2) 512K x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 132MB | (2) 16M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 136MB | (2) 1M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 136MB | (2) 16M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 144MB | (2) 2M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 144MB | (2) 16M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 160MB | (2) 4M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 160MB | (2) 16M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 192MB | (2) 8M x 36 | (2) 16M 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 |
|------------------+--------------------+--------------------|
| 258MB | (2) 256K x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 258MB | (2) 32M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 260MB | (2) 512K x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 260MB | (2) 32M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 264MB | (2) 1M x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 264MB | (2) 32M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 272MB | (2) 2M x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 272MB | (2) 32M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 288MB | (2) 4M x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 288MB | (2) 32M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 320MB | (2) 8M x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 320MB | (2) 32M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 384MB | (2) 16M x 36 | (2) 32M x 36 |
|------------------+--------------------+--------------------|
| 384MB | (2) 32M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 512MB | (2) 32M x 36 | (2) 32M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG | SL2 |
|-------+-----------+-------------+-------------+------------|
| 256KB | (4) 32K x | (4) 32K x 8 | (1) 8K or | Card not |
| | 8 | | (1) 32K x 8 | installed |
|-------+-----------+-------------+-------------+------------|
| 256KB | NONE | NONE | NONE | Card |
| | | | | installed |
|-------+-----------+-------------+-------------+------------|
| 512KB | (4) 64K x | (4) 64K x 8 | (1) 8K or | Card not |
| | 8 | | (1) 32K x 8 | installed |
|-------+-----------+-------------+-------------+------------|
| 512KB | NONE | NONE | NONE | Card |
| | | | | installed |
|-------+-----------+-------------+-------------+------------|
| 1MB | (4) 128K | (4) 128K x | (1) 8K or | Card not |
| | x 8 | 8 | (1) 32K x 8 | installed |
|-------+-----------+-------------+-------------+------------|
| 1MB | NONE | NONE | NONE | Card |
| | | | | installed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP10 | JP11 |
|------------------+--------------------+--------------------|
| 256KB | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 512KB | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 1MB | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP6 | JP7 | JP8 | JP9 |
|------------------+----------+----------+---------+---------|
| 3.3v cache | Open | Open | Closed | Closed |
|------------------+----------+----------+---------+---------|
| Mixed mode cache | Closed | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP12 | JP13 | JP14 |
|--------+-----------------+----------------+----------------|
| 75MHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 90MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 100MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 120MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 133MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 150MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 166MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP20 | JP21 |
|-------------------+--------------------+-------------------|
| 1.5x | Open | Open |
|-------------------+--------------------+-------------------|
| 2x | Open | Closed |
|-------------------+--------------------+-------------------|
| 2.5x | Closed | Closed |
|-------------------+--------------------+-------------------|
| 3x | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOLTAGE REGULATOR CONFIGURATION |
|------------------------------------------------------------|
| Type | JP22 | JP23 | JP28 | JP29 |
|------------+-----------+-----------+-----------+-----------|
| STD/VR | Closed | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| VRE | Open | Closed | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOLTAGE REGULATOR TYPE CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP32 | JP33 | JP34 | JP35 |
|-----------------+-----------+----------+---------+---------|
| Not installed | Closed | Closed | Closed | Closed |
|-----------------+-----------+----------+---------+---------|
| Installed | Open | Open | Open | Open |
|------------------------------------------------------------|
| Note: The location of the above jumpers are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| UART/IR CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP1A | JP1B |
|------------------+--------------------+--------------------|
| UART2 | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| IR | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+