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# JPN CORPORATION
MB386SX
Processor 80386SX
Processor Speed 16/20/25MHz
Chip Set VLSI
Max. Onboard DRAM 4MB
Cache None
BIOS AMI
Dimensions 220mm x 220mm
I/O Options None
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+-----------+--------------+-----------|
| Speaker | JP20 | Turbo switch | JP52 |
|---------------------+-----------+--------------+-----------|
| Power LED & keylock | JP30 | Turbo LED | JP56 |
|---------------------+-----------+--------------+-----------|
| Reset switch | JP51 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Pipeline mode enabled | JP10 | closed |
|---+----------------------------------+--------+------------|
| | Pipeline mode disabled | JP10 | open |
|---+----------------------------------+--------+------------|
| » | BIOS type select 27256 | JP23 | open |
| | | | |
| | | JP24 | closed |
|---+----------------------------------+--------+------------|
| | BIOS type select 27128 | JP23 | open |
| | | | |
| | | JP24 | open |
|---+----------------------------------+--------+------------|
| | BIOS type select 27512 | JP23 | closed |
| | | | |
| | | JP24 | closed |
|---+----------------------------------+--------+------------|
| » | Parity check enabled | JP25 | closed |
|---+----------------------------------+--------+------------|
| | Parity check disabled | JP25 | open |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP31 | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP31 | open |
|---+----------------------------------+--------+------------|
| » | Power good signal detect from | JP55 | pins 1 & 2 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | JP55 | pins 2 & 3 |
| | power supply | | closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP58 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP58 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP59 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Parity | Bank 1 | Parity | Bank 2 | Bank |
| | | (P-0) | | (P-1) | | 3 |
|-------+--------+--------+--------+--------+--------+-------|
| 512KB | (4) | (2) | NONE | NONE | NONE | NONE |
| | 44256 | 41256 | | | | |
|-------+--------+--------+--------+--------+--------+-------|
| 1MB | (4) | (2) | (4) | (2) | NONE | NONE |
| | 44256 | 41256 | 44256 | 41256 | | |
|-------+--------+--------+--------+--------+--------+-------|
| 1.5MB | (4) | (2) | (4) | (2) | (2) | NONE |
| | 44256 | 41256 | 44256 | 41256 | 256K x | |
| | | | | | 9 | |
|-------+--------+--------+--------+--------+--------+-------|
| 2MB | (4) | (2) | (4) | (2) | (2) | (2) |
| | 44256 | 41256 | 44256 | 41256 | 256K x | 256K |
| | | | | | 9 | x 9 |
|-------+--------+--------+--------+--------+--------+-------|
| 2MB | NONE | NONE | NONE | NONE | (2) 1M | NONE |
| | | | | | x 9 | |
|-------+--------+--------+--------+--------+--------+-------|
| 3MB | (4) | (2) | (4) | (2) | (2) 1M | NONE |
| | 44256 | 41256 | 44256 | 41256 | x 9 | |
|-------+--------+--------+--------+--------+--------+-------|
| 4MB | NONE | NONE | NONE | NONE | (2) 1M | (2) |
| | | | | | x 9 | 1M x |
| | | | | | | 9 |
+------------------------------------------------------------+