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# FREE COMPUTER TECHNOLOGY, INC.
80486L-EISA
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set SIS
Max. Onboard DRAM 128MB
SRAM Cache 64/128/256/512KB
BIOS Phoenix
Dimensions 330mm x 218mm
I/O Options 32-bit L-ISA local bus card slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| C ONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+-----------------------+----------|
| Turbo LED | H1 | Speaker | H4 |
|--------------+----------+-----------------------+----------|
| Reset switch | H2 | Power LED & keylock | H5 |
|--------------+----------+-----------------------+----------|
| Turbo switch | H3 | 32-bit L-ISA local | S1 |
| | | bus card | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| U24 | U35 | JP4 | JP5 | JP11 | JP12 |
|----------+------------+--------+-------+---------+---------|
| 80486DX2 | 80486SX/DX | pins 1 | pins | open | closed |
| | | & 2 | 1 & 2 | | |
| | | | and 3 | | |
| | | | & 4 | | |
|----------+------------+--------+-------+---------+---------|
| 80487SX | 80486SX/DX | pins 2 | pins | open | closed |
| | | & 3 | 1 & 2 | | |
| | | | and 3 | | |
| | | | & 4 | | |
|----------+------------+--------+-------+---------+---------|
| 80486SX | 80486SX/DX | open | pins | open | closed |
| | | | 2 & 3 | | |
|----------+------------+--------+-------+---------+---------|
| NONE | 80486SX/DX | pins 1 | pins | closed | open |
| | | & 2 | 1 & 2 | | |
| | | | and 3 | | |
| | | | & 4 | | |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
| |
| U35 is a surface mount CPU that may or may not have been |
| installed at the factory. |
| |
| U24 is a socketed CPU that has been installed at the |
| factory, or can be installed by the user. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|-----------+------------------------+-----------------------|
| 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 |
|-----------+------------------------+-----------------------|
| 64MB | (4) 16M x 9 | NONE |
|-----------+------------------------+-----------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | JP2 | JP3 |
|------------+-------------+-------------+-------------------|
| 64KB | open | open | open |
|------------+-------------+-------------+-------------------|
| 128KB | open | closed | pins 1 & 2 closed |
|------------+-------------+-------------+-------------------|
| 256KB | open | closed | pins 2 & 3 closed |
|------------+-------------+-------------+-------------------|
| 512KB | closed | closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache SRAM | 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 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | Bank 0 | (1) 32K x 8 |
+------------------------------------------------------------+