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# UNIDENTIFIED
486SX-DX MAINBOARD
Processor 80486SX/80487SX/80486DX/80486DX2
Processor 33/40/50/66(internal)MHz
Speed
Chip Set Unidentifed
Max. Onboard 32MB
DRAM
Cache None
BIOS Award
Dimensions 254mm x 220mm
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 |
|----------------------+----------+---------------+----------|
| VGA port | CN1 | Power LED & | J1 |
| | | keylock | |
|----------------------+----------+---------------+----------|
| Parallel port | CN2 | Turbo switch | J2 pins |
| | | | 1 & 2 |
|----------------------+----------+---------------+----------|
| Serial port 1 | CN3 | Turbo LED | J2 pins |
| | | | 4 & 5 |
|----------------------+----------+---------------+----------|
| Serial port 2 | CN4 | Speaker | J3 |
|----------------------+----------+---------------+----------|
| PS/2 mouse port | CN5 | Reset switch | J4 |
|----------------------+----------+---------------+----------|
| IDE interface | CN6 | IDE interface | J5 |
| | | LED | |
|----------------------+----------+---------------+----------|
| Floppy drive | CN7 | Riser Card | SL1 |
| interface | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Video mode select interlaced | JP7 | Closed |
|---+----------------------------------+--------+------------|
| | Video mode select non-interlaced | JP7 | Open |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP10 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP10 | Open |
|---+----------------------------------+--------+------------|
| » | CPU OSC select 66MHz | jp11 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU OSC select 50MHz | jp11 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | On board VGA enabled | JP12 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | On board VGA disabled | JP12 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select VESA | JP14 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select VGA | JP14 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP3 | JP6 |
|------------------+--------------------+--------------------|
| 33MHz | 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 |
|------------------+--------------------+--------------------|
| 66iMHz | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+