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# FORCOM TECHNOLOGY CORPORATION
80486 DX/SX CACHE
Processor 80486SX/80487SX/80486DX/80486DX2
Processor 20/25/33/50i/66iMHz
Speed
Chip Set ALI
Max. Onboard 32MB
DRAM
Cache 128/256KB
BIOS Award
Dimensions 330mm x 218mm
I/O Options Floppy drive interface, IDE interface, parallel
port, PS/2 mouse port,
serial ports (2), VGA port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Serial port 1 | CN1 | Speaker | CN7 |
|----------------+----------+---------------------+----------|
| Serial port 2 | CN2 | Reset switch | CN8 |
|----------------+----------+---------------------+----------|
| Parallel port | CN3 | Floppy drive | CN9 |
| | | interface | |
|----------------+----------+---------------------+----------|
| VGA port | CN4 | IDE interface | CN10 |
|----------------+----------+---------------------+----------|
| Power LED & | CN5 | IDE interface LED | JP8 |
| keylock | | | |
|----------------+----------+---------------------+----------|
| Turbo switch & | CN6 | | |
| LED | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | Monitor in interlace mode | JP7 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor in non-interlace mode | JP7 | Open |
|---+--------------------------------+--------+--------------|
| » | Monitor type select monochrome | JP10 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select color | JP10 | Open |
|---+--------------------------------+--------+--------------|
| » | CPU clock select 33MHz | JP11 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CPU clock select 25MHz | JP11 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | VGA display enabled | JP12 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | VGA display disabled | JP12 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | VESA monitor enabled | JP14 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | VGA monitor enabled | JP14 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 3 |
|------------------+--------------------+--------------------|
| 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 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS CLOCK CONFIGURATION |
|------------------------------------------------------------|
| OSC Clock | JP3 | JP6 |
|------------------+--------------------+--------------------|
| 32MHz | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 40MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 50MHz | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 66MHz | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | JP4 | JP5 |
|------------------+--------------------+--------------------|
| 80486SX | Open | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80487SX | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80486DX | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80486DX2 | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+