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# FREE COMPUTER TECHNOLOGY, INC.
80486VESA (03-0027X-01)
Device Type Mainboard
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/40/50(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 slot (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| External battery | JP1 | Turbo LED | JP16 |
|-------------------+----------+------------------+----------|
| Power saving | JP2 | Speaker | JP17 |
| feature | | | |
|-------------------+----------+------------------+----------|
| Power saving | JP11 | Power LED & | JP18 |
| feature | | keylock | |
|-------------------+----------+------------------+----------|
| Reset switch | JP14 | 32-bit VESA card | S1 |
|-------------------+----------+------------------+----------|
| Turbo switch | JP15 | 32-bit VESA card | S2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM 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) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP6 | JP7 | JP8 |
|----------+----------------+----------------+---------------|
| 20MHz | Open | Closed | Closed |
|----------+----------------+----------------+---------------|
| 25MHz | Closed | Open | Closed |
|----------+----------------+----------------+---------------|
| 33MHz | Closed | Closed | Open |
|----------+----------------+----------------+---------------|
| 40MHz | Open | Open | Closed |
|----------+----------------+----------------+---------------|
| 50MHz | Open | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | JP9 | JP10 | JP22 | JP23 |
|-----------------+--------------+--------+---------+--------|
| 80486SX/DX PQFP | 1 & 2, 3 & 4 | 1 & 2 | Closed | Open |
|-----------------+--------------+--------+---------+--------|
| 80486SX PGA | 2 & 3 | Open | Open | Closed |
|-----------------+--------------+--------+---------+--------|
| 80486DX/DX2 PGA | 1 & 2, 3 & 4 | 1 & 2 | Open | Closed |
|-----------------+--------------+--------+---------+--------|
| 80487SX/SX2 PGA | 1 & 2, 3 & 4 | 2 & 3 | Open | Closed |
|-----------------+--------------+--------+---------+--------|
| (2)80486DX2 PGA | 1 & 2, 3 & 4 | 1 & 2 | Open | Closed |
|-----------------+--------------+--------+---------+--------|
| (2)80487SX PGA | 1 & 2, 3 & 4 | 2 & 3 | Open | Closed |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| WAIT STATE SELECTION |
|------------------------------------------------------------|
| Setting | JP19 |
|------------------------------+-----------------------------|
| 0 | Open |
|------------------------------+-----------------------------|
| 1 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL-BUS SPEED SELECTION |
|------------------------------------------------------------|
| Setting | JP20 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| >33 MHz | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE SIZE |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|---------------+--------------+--------------+--------------|
| 64KB | (8) 8K x 8 | (8) 8K x 8 | (1) 8K x 8 |
|---------------+--------------+--------------+--------------|
| 128KB | (4) 32K x 32 | None | (1) 8K x 8 |
|---------------+--------------+--------------+--------------|
| 256KB | (8) 32K x 8 | (8) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER |
|------------------------------------------------------------|
| Size | JP12 | JP13 |
|-------------------+---------------------+------------------|
| 64KB | Open | Open |
|-------------------+---------------------+------------------|
| 128KB | Closed | 1 & 2 |
|-------------------+---------------------+------------------|
| 256KB | Closed | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+