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# UNIDENTIFIED
486-VESA
Processor CX486S/80486SX/80486DX/80486DX2
Processor Speed 20/25/33/40/50 (internal)/50MHz
Chip Set PC Chips
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 250mm x 220mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| External | J1 | Turbo LED | J23 |
| battery | | | |
|---------------+----------+----------------------+----------|
| Turbo switch | J3 | Power LED & keylock | J24 |
|---------------+----------+----------------------+----------|
| Speaker | J21 | Weitek daughtercard | W1 |
| | | connector | |
|---------------+----------+----------------------+----------|
| Reset switch | J22 | 32-bit VESA local | SL1 & |
| | | bus slots | SL2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select color | J2 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | J2 | Open |
|---+----------------------------------+--------+------------|
| » | Fast gate A20 mode enabled | J13 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Fast gate A20 mode disabled | J13 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J25 | Closed |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Setting | J18 | J19 | J20 |
|----------+------------+------------+-----------------------|
| CX486S2 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 closed |
| | closed | closed | |
|----------+------------+------------+-----------------------|
| 80486SX | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 closed |
| | closed | closed | |
|----------+------------+------------+-----------------------|
| 80486DX | pins 1 & 2 | pins 1 & 2 | pins 1 & 2, 3 & 4 |
| | closed | closed | closed |
|----------+------------+------------+-----------------------|
| 80486DX2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2, 3 & 4 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | J4 | J5 | J6 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE WRITE MODE CONFIGURATION |
|------------------------------------------------------------|
| Mode | Size | J15 | J16 | J17 |
|---------------+-------+------------+-----------+-----------|
| Write-through | Any | pins 2 & 3 | pins 1 & | pins 1 & |
| | | closed | 2 closed | 2 closed |
|---------------+-------+------------+-----------+-----------|
| Write-back | 64KB | pins 2 & 3 | pins 1 & | pins 2 & |
| | | closed | 2 closed | 3 closed |
|---------------+-------+------------+-----------+-----------|
| Write-back | 128KB | pins 2 & 3 | pins 2 & | pins 1 & |
| | | closed | 3 closed | 2 closed |
|---------------+-------+------------+-----------+-----------|
| Write-back | 256KB | pins 1 & 2 | pins 1 & | pins 1 & |
| | | closed | 2 closed | 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | J12 | J26 |
|--------------------+--------------------+------------------|
| 0 wait states | pins 2 & 3 closed | Open |
|--------------------+--------------------+------------------|
| 1 wait state | pins 1 & 2 closed | Closed |
+------------------------------------------------------------+