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# FREE COMPUTER TECHNOLOGY, INC.
80486VISA
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set SIS
Max. Onboard DRAM 32MB
SRAM Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options 32-bit VESA local bus (2)
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | JP1 | Speaker | JP17 |
|------------------+----------+-------------------+----------|
| Reset switch | JP14 | Power LED & | JP18 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Turbo switch | JP15 | 32-bit VESA local | S1 & S2 |
| | | bus slots (2) | |
|------------------+----------+-------------------+----------|
| Turbo LED | JP16 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+---------+-----------|
| ยป | Monitor type select monochrome | JP2 | Closed |
|---+----------------------------------+---------+-----------|
| | Monitor type select color | JP2 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | Location | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP12 | JP13 |
|-------------------+-------------------+--------------------|
| 64KB | Open | Open |
|-------------------+-------------------+--------------------|
| 128KB | Closed | pins 1 & 2 closed |
|-------------------+-------------------+--------------------|
| 256KB | Closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU JUMPER CONFIGURATION |
|------------------------------------------------------------|
| CPU | JP9 | JP10 |
|----------+-----------------------------+-------------------|
| 80486DX2 | pins 1 & 2 and 3 & 4 closed | pins 1 & 2 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 |
|----------+-----------------------------+-------------------|
| 80487SX | pins 1 & 2 and 3 & 4 closed | pins 2 & 3 closed |
|----------+-----------------------------+-------------------|
| 80486SX | pins 2 & 3 closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP6 | JP7 | JP11 |
|---------------+------------+-----------+-------------------|
| 20MHz | Closed | Closed | pins 1 & 2 closed |
|---------------+------------+-----------+-------------------|
| 25/50i MHz | Open | Closed | pins 1 & 2 closed |
|---------------+------------+-----------+-------------------|
| 33/66i MHz | Closed | Open | pins 1 & 2 closed |
|---------------+------------+-----------+-------------------|
| 40MHz | Closed | Closed | pins 2 & 3 closed |
|---------------+------------+-----------+-------------------|
| 50MHz | Open | Closed | pins 2 & 3 closed |
+------------------------------------------------------------+