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# UNIDENTIFIED
UM 386SX
Processor 80386SX
Processor Speed 16/20/24MHz
Chip Set UMC
Max. Onboard DRAM 5MB
Cache None
BIOS AMI
Dimensions 221mm x 216mm
I/O Options None
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Speaker | J1 | Turbo switch | J5 |
|------------------+----------+-------------------+----------|
| Power LED & | J2 | External battery | J6 |
| keylock | | | |
|------------------+----------+-------------------+----------|
| Reset switch | J3 | Auxiliary | JP2 |
| | | keyboard | |
|------------------+----------+-------------------+----------|
| Turbo LED | J4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+---------+-----------|
| ยป | Monitor type select color | JP3 | Closed |
|---+----------------------------------+---------+-----------|
| | Monitor type select monochrome | JP3 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Parity | Bank 1 | Parity | Bank | Bank |
| | | (P-0) | | (P-1) | 2 | 3 |
|-------+--------+----------+--------+--------+-------+------|
| 512KB | (4) | (2) | NONE | NONE | NONE | NONE |
| | 44256 | 41256 | | | | |
|-------+--------+----------+--------+--------+-------+------|
| 512KB | NONE | NONE | NONE | NONE | (2) | NONE |
| | | | | | 256K | |
| | | | | | x 9 | |
|-------+--------+----------+--------+--------+-------+------|
| 1MB | (4) | (2) | (4) | (2) | NONE | NONE |
| | 44256 | 41256 | 44256 | 41256 | | |
|-------+--------+----------+--------+--------+-------+------|
| 1MB | NONE | NONE | NONE | NONE | (2) | (2) |
| | | | | | 256K | 256K |
| | | | | | x 9 | x 9 |
|-------+--------+----------+--------+--------+-------+------|
| 2MB | (4) | (2) | (4) | (2) | (2) | (2) |
| | 44256 | 41256 | 44256 | 41256 | 256K | 256K |
| | | | | | x 9 | x 9 |
|-------+--------+----------+--------+--------+-------+------|
| 2MB | NONE | NONE | NONE | NONE | (2) | NONE |
| | | | | | 1M x | |
| | | | | | 9 | |
|-------+--------+----------+--------+--------+-------+------|
| 3MB | (4) | (2) | (4) | (2) | (2) | NONE |
| | 44256 | 41256 | 44256 | 41256 | 1M x | |
| | | | | | 9 | |
|-------+--------+----------+--------+--------+-------+------|
| 4MB | NONE | NONE | NONE | NONE | (2) | (2) |
| | | | | | 1M x | 1M x |
| | | | | | 9 | 9 |
|-------+--------+----------+--------+--------+-------+------|
| 5MB | (4) | (2) | (4) | (2) | (2) | (2) |
| | 44256 | 41256 | 44256 | 41256 | 1M x | 1M x |
| | | | | | 9 | 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 |
|--------+---------------------------------------------------|
| 512KB | pins 1&2, 3&4, 5&6, 7&8, 9&10, 11&12, 13&14, |
| | 15&16, 17&18, 19&20, 21&22, 23&24 |
|--------+---------------------------------------------------|
| 512KB | pins 1&3, 2&4, 5&7, 6&8, 9&11, 10&12, 13&15, |
| | 14&16, 17&19, 18&20, 21&23, 22&24 |
|--------+---------------------------------------------------|
| 1MB | pins 1&2, 3&4, 5&6, 7&8, 9&10, 11&12, 13&14, |
| | 15&16, 17&18, 19&20, 21&22, 23&24 |
|--------+---------------------------------------------------|
| 1MB | pins 1&3, 2&4, 5&7, 6&8, 9&11, 10&12, 13&15, |
| | 14&16, 17&19, 18&20, 21&23, 22&24 |
|--------+---------------------------------------------------|
| 2MB | pins 1&2, 3&4, 5&6, 7&8, 9&10, 11&12, 13&14, |
| | 15&16, 17&18, 19&20, 21&22, 23&24 |
|--------+---------------------------------------------------|
| 2MB | pins 1&3, 2&4, 5&7, 6&8, 9&11, 10&12, 13&15, |
| | 14&16, 17&19, 18&20, 21&23, 22&24 |
|--------+---------------------------------------------------|
| 3MB | pins 1&2, 3&4, 5&6, 7&8, 9&10, 11&12, 13&14, |
| | 15&16, 17&18, 19&20, 21&22, 23&24 |
|--------+---------------------------------------------------|
| 4MB | pins 1&3, 2&4, 5&7, 6&8, 9&11, 10&12, 13&15, |
| | 14&16, 17&19, 18&20, 21&23, 22&24 |
|--------+---------------------------------------------------|
| 5MB | pins 1&2, 3&4, 5&6, 7&8, 9&10, 11&12, 13&14, |
| | 15&16, 17&18, 19&20, 21&22, 23&24 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM PARITY CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP4 | JP5 |
|--------------------+-------------------+-------------------|
| Enabled | Closed | Closed |
|--------------------+-------------------+-------------------|
| Disabled | Open | Open |
+------------------------------------------------------------+