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# ELITEGROUP COMPUTER SYSTEMS, INC.
SI55P AIO
Processor Pentium
Processor Speed 75/90/100/120/133/150/166MHz
Chip Set SIS
Video Chip Set None
Maximum Onboard 128MB (EDO supported)
Memory
Maximum Video 1MB
Memory
Cache 256/512/1024KB
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
green PC connector, IDE interfaces (2),
parallel port, serial ports (2), IR
connector, VRM connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+-----------+----------------+-----------|
| Serial port 1 | J6 | Power LED & | J12 pins |
| | | keylock | 11 - 15 |
|-------------------+-----------+----------------+-----------|
| Floppy drive | J7 | Speaker | J12 pins |
| interface | | | 17 - 20 |
|-------------------+-----------+----------------+-----------|
| Parallel port | J8 | IDE interface | J13 |
| | | LED | |
|-------------------+-----------+----------------+-----------|
| Serial port 2 | J9 | VRM connector | J15 |
|-------------------+-----------+----------------+-----------|
| IDE interface 2 | J10 | IR connector | JP2 |
|-------------------+-----------+----------------+-----------|
| IDE interface 1 | J11 | Green PC | JP7 |
| | | connector | |
|-------------------+-----------+----------------+-----------|
| Turbo LED | J12 pins | Chassis fan | JP23 |
| | 2 & 3 | power | |
|-------------------+-----------+----------------+-----------|
| Green PC | J12 pins | 32-bit PCI | PC1 - PC4 |
| connector | 4 & 5 | slots | |
|-------------------+-----------+----------------+-----------|
| Reset switch | J12 pins | | |
| | 9 & 10 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| | On board I/O enabled | JP1 | Open |
|---+---------------------------------+-------+--------------|
| | On board I/O disabled | JP1 | Closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 12v | JP3 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 5v | JP3 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| ยป | Factory configured - do not | JP20 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 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 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM PARITY CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP8 |
|-------------------------------+----------------------------|
| Enabled | Closed |
|-------------------------------+----------------------------|
| Disabled | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-------------+---------------+---------------+--------------|
| 256KB (A) | (2) 32K x 32 | None | None |
|-------------+---------------+---------------+--------------|
| 256KB (B) | None | (8) 32K x 8 | (1) 32K x 8 |
|-------------+---------------+---------------+--------------|
| 512KB | None | (8) 64K x 8 | (1) 32K x 8 |
|-------------+---------------+---------------+--------------|
| 1MB | None | (8) 128K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP18 | JP19 |
|------------------+--------------------+--------------------|
| 256KB (A) | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 256KB (B) | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 512KB | Pins 2 & 3 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 1MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP14 | JP15 | JP16 |
|---------+----------------+----------------+----------------|
| 3.3v | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
|---------+----------------+----------------+----------------|
| Mixed | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| CPU |Clock |Multiplier| J15 | JP21 | JP22 | JP25 | JP26 |
| speed |speed | | | | | | |
|-------+------+----------+------+------+------+------+------|
| 75MHz |50MHz | 1.5x |6 & 7,| Open | Open |Closed| Open |
| | | | 21 & | | | | |
| | | | 22 | | | | |
|-------+------+----------+------+------+------+------+------|
| 90MHz |60MHz | 1.5x |6 & 7,| Open | Open | Open |Closed|
| | | | 21 & | | | | |
| | | | 22 | | | | |
|-------+------+----------+------+------+------+------+------|
|100MHz |66MHz | 1.5x |6 & 7,| Open | Open |Closed|Closed|
| | | | 21 & | | | | |
| | | | 22 | | | | |
|-------+------+----------+------+------+------+------+------|
|120MHz |60MHz | 2x |6 & 7,| Open |Closed| Open |Closed|
| | | | 21 & | | | | |
| | | | 22 | | | | |
|-------+------+----------+------+------+------+------+------|
|133MHz |66MHz | 2x |6 & 7,| Open |Closed|Closed|Closed|
| | | | 21 & | | | | |
| | | | 22 | | | | |
|-------+------+----------+------+------+------+------+------|
|150MHz |60MHz | 2.5x |6 & 7,|Closed|Closed| Open |Closed|
| | | | 21 & | | | | |
| | | | 22 | | | | |
|-------+------+----------+------+------+------+------+------|
|166MHz |66MHz | 2.5x |6 & 7,|Closed|Closed|Closed|Closed|
| | | | 21 & | | | | |
| | | | 22 | | | | |
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP17 |
|----------------------------+-------------------------------|
| 3.3v (STD) | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 3.385v (VR) | Pins 3 & 4 closed |
|----------------------------+-------------------------------|
| 3.525v (VRE) | Pins 5 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL SELECTION |
|------------------------------------------------------------|
| Channel | JP4 | JP6 |
|------------------+--------------------+--------------------|
| 1 | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 3 | Pins 2 & 3 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 SELECTION |
|------------------------------------------------------------|
| Setting | JP2 |
|----------------------------+-------------------------------|
| Used as COM2 | Pins 5 & 6, 7 & 8 closed |
|----------------------------+-------------------------------|
| Used as IR connector | Open |
+------------------------------------------------------------+