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# EVERSOURCE COMPUTERS, INC.
USA 486DX
Processor 80486DX
Processor Speed 33/50MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache 256KB
BIOS AMI
Dimensions 330mm x 220mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | J2 | Reset switch | J6 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Turbo switch | J4 | External battery | J7 |
|-------------------+----------+------------------+----------|
| Turbo LED | J5 | Speaker | J100 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+---------+-----------|
| ยป | Monitor type select color | J3 | Closed |
|---+----------------------------------+---------+-----------|
| | Monitor type select monochrome | J3 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 1MB | NONE | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 4MB | NONE | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1 M x 9 |
|------------------+--------------------+--------------------|
| 5MB | (4) 1 M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 16MB | NONE | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 1 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 1 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 8K x 1 |
|------------------------------------------------------------|
| Note:The exact location of TAG is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JMP1 | JMP2 | JMP3 |
|-------+------------+--------------------------+------------|
| 64KB | pins 1 & 2 | pins 1 & 2, 3 & 4 closed | pins 1 & 2 |
| | closed | | closed |
|-------+------------+--------------------------+------------|
| 128KB | pins 2 & 3 | pins 2 & 3 closed | pins 2 & 3 |
| | closed | | closed |
|-------+------------+--------------------------+------------|
| 256KB | pins 2 & 3 | pins 2 & 3 closed | pins 2 & 3 |
| | closed | | closed |
+------------------------------------------------------------+