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# UNIDENTIFIED
VESA 486 Version 1.1
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 25/33/50(internal)/50MHz
Chip Set UMC
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 220mm x 220mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J1 | Speaker | J7 |
|------------------+----------+-------------------+----------|
| Turbo LED | J4 | Power LED & | J8 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Turbo switch | J5 | 32-bit VESA Local | S1 |
| | | bus slot | |
|------------------+----------+-------------------+----------|
| Reset switch | J6 | 32-bit VESA Local | S2 |
| | | bus slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | Monitor type select color | JP1 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP1 | pins 1 & 2 |
| | | | 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 |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 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 |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (2) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 | JP10 | JP11 |
|-------+--------+--------+-----------------+----------------|
| 64KB | Open | Open | pins 1 & 2 | pins 1 & 2 |
| | | | closed | closed |
|-------+--------+--------+-----------------+----------------|
| 128KB | Open | Closed | pins 2 & 3 | pins 2 & 3 |
| | | | closed | closed |
|-------+--------+--------+-----------------+----------------|
| 256KB | Closed | Closed | pins 2 & 3 | pins 1 & 2 |
| | | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP14 | JP15 |
|----------+-----------------------------+-------------------|
| 80486SX | pins 2 & 3 closed | Open |
|----------+-----------------------------+-------------------|
| 80487SX | pins 1 & 2 and 3 & 4 closed | pins 2 & 3 closed |
|----------+-----------------------------+-------------------|
| 80486DX | pins 1 & 2 and 3 & 4 closed | pins 1 & 2 closed |
|----------+-----------------------------+-------------------|
| ODP486SX | pins 1 & 2 and 3 & 4 closed | pins 2 & 3 closed |
|----------+-----------------------------+-------------------|
| 80486DX2 | pins 1 & 2 and 3 & 4 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP4 | JP5 | JP6 | JP7 |
|---------+-------------+-------------+-----------+----------|
| 25MHz | Closed | Closed | Open | Open |
|---------+-------------+-------------+-----------+----------|
| 33MHz | Closed | Open | Open | Open |
|---------+-------------+-------------+-----------+----------|
| 50i MHz | Closed | Closed | Open | Open |
|---------+-------------+-------------+-----------+----------|
| 50MHz | Open | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE/BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | Wait states | JP12 | JP13 |
|---------------+---------------+--------------+-------------|
| £ 33MHz | 0 wait states | Open | Open |
|---------------+---------------+--------------+-------------|
| > 33MHz | 1 wait state | Closed | Closed |
+------------------------------------------------------------+