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# POSITIVE CORPORATION
PERSONAL COMPUTER SYTEMS SYSTEM BOARD
Processor 80386SX/80486SX/80487SX (depends on CPU board
installed)
Processor 20/33MHz
Speed
Chip Set Unidentified
Max. Onboard 32MB
DRAM
Cache 32/128KB (depends on CPU board installed)
BIOS Unidentified
Dimensions 254mm x 218mm
I/O Options Parallel port, serial ports (2), VGA port, VGA
feature connector, floppy drive interface, IDE
interface, riser slot, CPU slot
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| VGA port | J2 | External battery | J17 |
|-------------------+----------+------------------+----------|
| Serial port 1 | J3 | Turbo LED | J25 |
|-------------------+----------+------------------+----------|
| Serial port 2 | J4 | IDE interface | J26 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Parallel port | J5 | Auxiliary | J27 |
| | | speaker | |
|-------------------+----------+------------------+----------|
| VGA feature | J7 | Reset switch | S1 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Floppy drive | J11 | Riser Card | SL1 |
| interface | | | |
|-------------------+----------+------------------+----------|
| IDE interface | J12 | CPU slot | SL2 |
|-------------------+----------+------------------+----------|
| Speaker | J16 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | 256KB - 640KB memory enabled | J6 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | 256KB - 640KB memory disabled | J6 | pins 1 & 2 |
| | | | open |
|---+----------------------------------+--------+------------|
| » | 512KB - 640KB memory enabled | J6 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | 512KB - 640KB memory disabled | J6 | pins 3 & 4 |
| | | | open |
|---+----------------------------------+--------+------------|
| » | Security disabled | J6 | pins 5 & 6 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Security enabled | J6 | pins 5 & 6 |
| | | | open |
|---+----------------------------------+--------+------------|
| » | VGA mode select PS/2 | J10 | pins 5 & 6 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | VGA mode select AT | J10 | pins 5 & 6 |
| | | | open |
|---+----------------------------------+--------+------------|
| » | Monitor timing select any | J10 | pins 7 & 8 |
| | monitor timing | | open |
|---+----------------------------------+--------+------------|
| | Monitor timing select Multi Sync | J10 | pins 7 & 8 |
| | 1 timing | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J13 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J28 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 512KB | (2) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|-------+-------------+------------+------------+------------|
| 1MB | (2) 256K x | (2) 256K x | NONE | NONE |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 1.5MB | (2) 256K x | (2) 256K x | (2) 256K x | NONE |
| | 9 | 9 | 9 | |
|-------+-------------+------------+------------+------------|
| 2MB | (2) 256K x | (2) 256K x | (2) 256K x | (2) 256K x |
| | 9 | 9 | 9 | 9 |
|-------+-------------+------------+------------+------------|
| 2MB | (2) 1M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 2.5MB | (2) 1M x 9 | (2) 256K x | NONE | NONE |
| | | 9 | | |
|-------+-------------+------------+------------+------------|
| 3MB | (2) 256K x | (2) 256K x | (2) 1M x 9 | NONE |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 3.5MB | (2) 256K x | (2) 256K x | (2) 1M x 9 | (2) 256K x |
| | 9 | 9 | | 9 |
|-------+-------------+------------+------------+------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 4.5MB | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x | NONE |
| | | | 9 | |
|-------+-------------+------------+------------+------------|
| 5MB | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x | (2) 256K x |
| | | | 9 | 9 |
|-------+-------------+------------+------------+------------|
| 6MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | NONE |
|-------+-------------+------------+------------+------------|
| 6.5MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x |
| | | | | 9 |
|-------+-------------+------------+------------+------------|
| 8MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 |
|-------+-------------+------------+------------+------------|
| 8MB | (2) 4M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 8.5MB | (2) 4M x 9 | (2) 256K x | NONE | NONE |
| | | 9 | | |
|-------+-------------+------------+------------+------------|
| 9MB | (2) 256K x | (2) 256K x | (2) 4M x 9 | NONE |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 10MB | (2) 4M x 9 | (2) 1M x 9 | NONE | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|--------+------------+------------+------------+------------|
| 12MB | (2) 4M x 9 | (2) 1M x 9 | (2) 1M x 9 | NONE |
|--------+------------+------------+------------+------------|
| 14MB | (2) 1M x 9 | (2) 1M x 9 | (2) 4M x 9 | (2) 1M x 9 |
|--------+------------+------------+------------+------------|
| 16MB | (2) 4M x 9 | (2) 4M x 9 | NONE | NONE |
|--------+------------+------------+------------+------------|
| 16.5MB | (2) 4M x 9 | (2) 4M x 9 | (2) 256K x | NONE |
| | | | 9 | |
|--------+------------+------------+------------+------------|
| 17MB | (2) 4M x 9 | (2) 4M x 9 | (2) 256K x | (2) 256K x |
| | | | 9 | 9 |
|--------+------------+------------+------------+------------|
| 18MB | (2) 4M x 9 | (2) 4M x 9 | (2) 1M x 9 | NONE |
|--------+------------+------------+------------+------------|
| 20MB | (2) 4M x 9 | (2) 4M x 9 | (2) 1M x 9 | (2) 1M x 9 |
|--------+------------+------------+------------+------------|
| 24MB | (2) 4M x 9 | (2) 4M x 9 | (2) 4M x 9 | NONE |
|--------+------------+------------+------------+------------|
| 32MB | (2) 4M x 9 | (2) 4M x 9 | (2) 4M x 9 | (2) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|-------------------+--------------------+-------------------|
| 512KB | 512KB | NONE |
|-------------------+--------------------+-------------------|
| 1MB | 512KB | 512KB |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 32KB | (2) 8K x 8 | (2) 8K x 8 |
|------------------+--------------------+--------------------|
| 128KB | (2) 32K x 8 | (2) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 |
|----------------------------+-------------------------------|
| 32KB | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 128KB | pins 3 & 4 closed |
+------------------------------------------------------------+
IMG IMG 3
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|---------------------------------------+---------+----------|
| » | Factory configured - do not alter | JP1 | N/A |
+------------------------------------------------------------+
IMG IMG 4
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP2 |
|--------------------+-------------------+-------------------|
| 80486SX-20 | Open | Closed |
|--------------------+-------------------+-------------------|
| 80486SX-33 | Closed | Open |
|--------------------+-------------------+-------------------|
| 80487SX-20 | Closed | Open |
+------------------------------------------------------------+