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# UNIDENTIFIED
486SI4 (M-81)
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set C & T
Max. Onboard DRAM 32MB
SRAM Cache 128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options 32-bit local bus card slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+-----------------------+----------|
| Turbo LED | J3 | Reset switch | J6 |
|--------------+----------+-----------------------+----------|
| Turbo switch | J4 | Power LED & keylock | J7 |
|--------------+----------+-----------------------+----------|
| Speaker | J5 | 32-bit local bus card | S1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Local bus data size select | J8 | pins 1 & 2 |
| | 32-bits | | closed |
|---+----------------------------------+--------+------------|
| | Local bus data size select | J8 | pins 2 & 3 |
| | 16-bits | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP1 | open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP2 | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP2 | open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP3 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP4 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP5 | closed |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU JUMPER CONFIGURATION |
|------------------------------------------------------------|
| CPU | JP6 | JP7 | JP8 |
|----------+---------+-------------------+-------------------|
| 80486DX | closed | pins 1 & 2 closed | pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 80487SX | closed | pins 2 & 3 closed | pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 80486SX | open | open | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Jumper | 128KB | 256KB |
|------------------+--------------------+--------------------|
| SR1 | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| SR2 | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| SR3 | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| SR4 | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| SR5 | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| SR6 | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| SR7 | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| SR8 | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| SR9 | pins 1 & 2 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache SRAM | Location | TAG |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 8K x 8 |
+------------------------------------------------------------+