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# UNIDENTIFIED
486SX/DX/DX2
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 16/20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set UMC
Max. Onboard 64MB
DRAM
Cache 64/128/256KB
BIOS Award
Dimensions 254mm x 220mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Speaker | J2 | Reset switch | J6 |
|---------------+----------+----------------------+----------|
| Power LED & | J3 | External battery | J11 |
| keylock | | | |
|---------------+----------+----------------------+----------|
| Turbo switch | J4 | 32-bit VESA local | SL1 & |
| | | bus slots | SL2 |
|---------------+----------+----------------------+----------|
| Turbo LED | J5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | PQFP CPU disabled | JP8 | Open |
|---+----------------------------------+--------+------------|
| | PQFP CPU enabled | JP8 | Closed |
|---+----------------------------------+--------+------------|
| » | VESA video card select normal | JP16 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | VESA video card select Power | JP16 | pins 2 & 3 |
| | A9000 | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 1MB | NONE | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 4MB | NONE | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 16MB | NONE | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | JP2 | JP4 | JP5 |
|-------+-------------+------------+------------+------------|
| 64KB | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 128KB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 256KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP6 | JP7 |
|------------+--------------------------+--------------------|
| 80486SX | pins 2 & 3 closed | Open |
|------------+--------------------------+--------------------|
| 80487SX | pins 1 & 2, 3 & 4 closed | pins 2 & 3 closed |
|------------+--------------------------+--------------------|
| 80486DX | pins 1 & 2, 3 & 4 closed | pins 1 & 2 closed |
|------------+--------------------------+--------------------|
| 80486DX2 | pins 1 & 2, 3 & 4 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP9 | JP10 | JP11 | JP12 |
|------------+-----------+-----------+-----------+-----------|
| 16MHz | Closed | Closed | Closed | Closed |
|------------+-----------+-----------+-----------+-----------|
| 20MHz | Open | Closed | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 25MHz | Closed | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 33MHz | Closed | Closed | Open | Open |
|------------+-----------+-----------+-----------+-----------|
| 40MHz | Open | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 50iMHz | Closed | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 50MHz | Open | Closed | Open | Open |
|------------+-----------+-----------+-----------+-----------|
| 66iMHz | Closed | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | ID3 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| > 33MHz | Closed |
+------------------------------------------------------------+