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# SILICON STAR INTERNATIONAL, INC.
AT4
Processor 80486SX/80486DX/P23T
Processor Speed 16/25/33/50MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard Memory 32MB
Maximum Video Memory None
Cache 32/64/128/256/512/1024KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Speaker | CN1 | Turbo switch | JP1 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | CN2 | Turbo LED | JP2 |
|---------------------+----------+----------------+----------|
| External battery | CN3 | Reset switch | SW1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| » | CMOS memory normal operation | JP5 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | CMOS memory clear | JP5 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Monitor type select CGA/EGA/VGA | JP7 | Closed |
|---+-----------------------------------+-------+------------|
| | Monitor type select monochrome | JP7 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | JP8 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | JP9 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG | TAG0 |
|---------+------------+------------+------------+-----------|
| 32KB | (4) 8K x 8 | None | (1) 8K x 8 | (2) 16K x |
| | | | | 4 |
|---------+------------+------------+------------+-----------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | (2) 16K x |
| | | | | 4 |
|---------+------------+------------+------------+-----------|
| 128KB | (4) 32K x | None | (1) 8K x 8 | (2) 16K x |
| | 8 | | | 4 |
|---------+------------+------------+------------+-----------|
| 256KB | (4) 32K x | (4) 32K x | (1) 32K x | (2) 16K x |
| | 8 | 8 | 8 | 4 |
|---------+------------+------------+------------+-----------|
| 512KB | (4) 128K x | None | (1) 32K x | (2) 64K x |
| | 8 | | 8 | 4 |
|---------+------------+------------+------------+-----------|
| 1MB | (4) 128K x | (4) 128K x | (1) 128K x | (2) 64K x |
| | 8 | 8 | 8 | 4 |
|------------------------------------------------------------|
| Note: Use either TAG chip or TAG0 chips. All three sockets |
| can’t be installed at the same time. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 | JP4 | JPX4 | JPX5 |
|-------+--------+--------+--------------------+-------------|
| 32KB | N/A | Open | Pins 1 - 8 | Pins 1 - 8 |
| | | | installed | installed |
|-------+--------+--------+--------------------+-------------|
| 64KB | N/A | Open | Pins 9 - 16 | Pins 3 - 10 |
| | | | installed | installed |
|-------+--------+--------+--------------------+-------------|
| 128KB | N/A | Closed | Pins 1 - 8 | Pins 5 - 12 |
| | | | installed | installed |
|-------+--------+--------+--------------------+-------------|
| 256KB | N/A | Closed | Pins 9 - 16 | Pins 7 - 14 |
| | | | installed | installed |
|-------+--------+--------+--------------------+-------------|
| 512KB | N/A | Closed | Pins 1 - 8 | Pins 9 - 16 |
| | | | installed | installed |
|-------+--------+--------+--------------------+-------------|
| 1MB | Closed | Closed | Pins 9 - 16 | Pins 9 - 16 |
| | | | installed | installed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP6 | JPX3 |
|--------------------+------------------+--------------------|
| 80486SX | Closed | Not installed |
|--------------------+------------------+--------------------|
| 80486DX | Open | Installed |
|--------------------+------------------+--------------------|
| P23T | Open | Installed |
+------------------------------------------------------------+