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# FREE COMPUTER TECHNOLOGY, INC.
80486L-ISA
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set UNI
Max. Onboard DRAM 128MB
SRAM Cache 64/128/256KB
BIOS AMI/Award
Dimensions 254mm x 218mm
I/O Options 32-bit local bus card slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| 32-bit local bus | CN1 | Speaker | H4 |
| card | | | |
|------------------+----------+-------------------+----------|
| Turbo switch | H1 | Power LED & | H5 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Turbo LED | H2 | External battery | JP1 |
|------------------+----------+-------------------+----------|
| Reset switch | H3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+---------+-----------|
| ยป | Monitor type select color | JP12 | open |
|---+----------------------------------+---------+-----------|
| | Monitor type select monochrome | JP12 | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| U26 | U51 | J4 | J5 | J7 | J8 |
|-----------+---------+---------+--------+---------+---------|
| 80486DX2 | 80486DX | pins 1 | pins 1 | closed | open |
| | | & 2 and | & 2 | | |
| | | 3 & 4 | | | |
|-----------+---------+---------+--------+---------+---------|
| 80486DX | 80486DX | pins 1 | pins 1 | closed | open |
| | | & 2 and | & 2 | | |
| | | 3 & 4 | | | |
|-----------+---------+---------+--------+---------+---------|
| 80487SX | 80486DX | pins 1 | pins 2 | closed | open |
| | | & 2 and | & 3 | | |
| | | 3 & 4 | | | |
|-----------+---------+---------+--------+---------+---------|
| 80486SX | 80486DX | pins 2 | open | closed | open |
| | | & 3 | | | |
|-----------+---------+---------+--------+---------+---------|
| NONE | 80486DX | pins 1 | pins 1 | open | closed |
| | | & 2 and | & 2 | | |
| | | 3 & 4 | | | |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
| |
| U51 is a surface mounted CPU (PQFP) that may or may not |
| have been installed at the factory. |
| |
| U26 is a socketed CPU (PGA) 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 |
|-----------+------------------------+-----------------------|
| 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) 1M x 9 | (4) 4M x 9 |
|-----------+------------------------+-----------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|-----------+------------------------+-----------------------|
| 64MB | (4) 16M x 9 | NONE |
|-----------+------------------------+-----------------------|
| 80MB | (4) 16M x 9 | (4) 4M x 9 |
|-----------+------------------------+-----------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP2 | JP3 |
|-------------------+--------------------+-------------------|
| 64KB | open | open |
|-------------------+--------------------+-------------------|
| 128KB | pins 2 & 3 closed | closed |
|-------------------+--------------------+-------------------|
| 256KB | pins 1 & 2 closed | 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 |
+------------------------------------------------------------+