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# UNIDENTIFIED
SIH 486B
Processor 80486SX/80486DX/P23N/P23T
Processor Speed 16/20/25/33/40/50MHz
Chip Set ASIC
Video Chip Set None
Maximum Onboard Memory 32MB
Maximum Video Memory None
Cache 32/64/128/256KB
BIOS AMI
Dimensions 218mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | J1 | Turbo LED | J5 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J3 | Turbo switch | J7 |
|---------------------+----------+----------------+----------|
| Speaker | J4 | Reset switch | J8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|--------------------------------------+---------+-----------|
| | Monitor type select color | J2 | Open |
|---+----------------------------------+---------+-----------|
| | Monitor type select monochrome | J2 | 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) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG 0 | TAG 1 |
|-------+-------------+------------+------------+------------|
| 32KB | (4) 8K x 8 | None | (1) 16K x | (1) 8K x 8 |
| | | | 4 | |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 16K x | (1) 8K x 8 |
| | | | 4 | |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | None | (1) 16K x | (1) 32K x |
| | | | 4 | 8 |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 16K x | (1) 32K x |
| | | 8 | 4 | 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J11 | J12 | J13 | J14 | J15 |
|----------+----------+----------+---------+--------+--------|
| 32KB | 1 & 2 | Open | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 64KB | 2 & 3 | Open | 1 & 2 | 2 & 3 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 128KB | 1 & 2 | 1 & 2 | 2 & 3 | 2 & 3 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | J16 | J17 | J18 | J19 |
|-------+-------------+------------+------------+------------|
| 32KB | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 64KB | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 128KB | Pins 1 & 2 | Pins 2 & 3 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 256KB | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | OSC installed in Y1 | J9 |
|-----------------+---------------------+--------------------|
| 16MHz | 32MHz | Pins 2 & 3 closed |
|-----------------+---------------------+--------------------|
| 20MHz | 40MHz | Pins 2 & 3 closed |
|-----------------+---------------------+--------------------|
| 25MHz | 50MHz | Pins 2 & 3 closed |
|-----------------+---------------------+--------------------|
| 25MHz | 25MHz | Pins 1 & 2 closed |
|-----------------+---------------------+--------------------|
| 33MHz | 33MHz | Pins 1 & 2 closed |
|-----------------+---------------------+--------------------|
| 50MHz | 50MHz | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | J20 | J21 | J22 |
|----------+---------+-------------------+-------------------|
| 80486SX | Open | Pins 2 & 3 closed | Open |
|----------+---------+-------------------+-------------------|
| 80486DX | Closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| P23N | Closed | Pins 1 & 2 closed | Pins 2 & 3 closed |
|----------+---------+-------------------+-------------------|
| P23T | Closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+