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# POSITIVE CORPORATION
PC425
Processor 80486SX
Processor 25MHz
Speed
Chip Set Unidentified
Max. Onboard 5MB
DRAM
Cache None
BIOS Unidentified
Dimensions 254mm x 218mm
I/O Options Parallel port, serial ports (2), VGA port, floppy
drive interface, IDE interface, riser slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Serial port 2 | J2 | External battery | J12 |
|------------------+----------+-------------------+----------|
| Serial port 1 | J3 | Power/speed | J17 |
| | | indicator | |
|------------------+----------+-------------------+----------|
| Parallel port | J4 | VGA port | J22 |
|------------------+----------+-------------------+----------|
| Speaker | J6 | Riser Card | SL1 |
|------------------+----------+-------------------+----------|
| Floppy drive | J10 | Reset switch | SW1 |
| interface | | | |
|------------------+----------+-------------------+----------|
| IDE interface | J11 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Factory configured - do | E1 | pins 2 & 3 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | IDE interface interrupt | E2 | pins 1 & 2 |
| | enabled | | closed |
|---+---------------------------+---------------+------------|
| | IDE interface interrupt | E2 | Open |
| | disabled | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E3 | pins 2 & 3 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E4 | pins 2 & 3 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E5 | pins 2 & 3 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E8 | pins 1 & 2 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E9 | pins 2 & 3 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Parity disabled | E10 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | Parity enabled | E10 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E11 | pins 2 & 3 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Onboard RAM 256KB to | sw2/1 | Off |
| | 512KB enabled | | |
|---+---------------------------+---------------+------------|
| | Onboard RAM 256KB to | sw2/1 | On |
| | 512KB disabled | | |
|---+---------------------------+---------------+------------|
| » | Onboard RAM 512KB to | sw2/2 | Off |
| | 640KB enabled | | |
|---+---------------------------+---------------+------------|
| | Onboard RAM 512KB to | sw2/2 | On |
| | 640KB disabled | | |
|---+---------------------------+---------------+------------|
| » | Security enabled | sw2/3 | Off |
|---+---------------------------+---------------+------------|
| | Security disabled | sw2/3 | On |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | sw2/4 | Off |
| | not alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|-----------------+-------------------+----------------------|
| 1MB | 1MB | NONE |
|-----------------+-------------------+----------------------|
| 5MB | 1MB | (4) 1M x 9 |
|------------------------------------------------------------|
| Note: Bank 0 is factory installed and is not configurable. |
| The location is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| IDE CONFIGURATION |
|------------------------------------------------------------|
| Setting | E6 | E7 |
|------------------+--------------------+--------------------|
| Primary | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| Secondary | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+