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 | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Speaker | J1 | Turbo switch | J5 | 
| Power LED & keylock | J2 | External battery | J6 | 
| Reset switch | J3 | Auxiliary keyboard | JP2 | 
| Turbo LED | J4 | ||
| USER CONFIGURABLE SETTINGS | |||
| Function | Jumper | Position | |
| » | Monitor type select color | JP3 | Closed | 
| Monitor type select monochrome | JP3 | Open | |
| DRAM CONFIGURATION | ||||||
| Size | Bank 0 | Parity (P-0) | Bank 1 | Parity (P-1) | Bank 2 | Bank 3 | 
| 512KB | (4) 44256 | (2) 41256 | NONE | NONE | NONE | NONE | 
| 512KB | NONE | NONE | NONE | NONE | (2) 256K x 9 | NONE | 
| 1MB | (4) 44256 | (2) 41256 | (4) 44256 | (2) 41256 | NONE | NONE | 
| 1MB | NONE | NONE | NONE | NONE | (2) 256K x 9 | (2) 256K x 9 | 
| 2MB | (4) 44256 | (2) 41256 | (4) 44256 | (2) 41256 | (2) 256K x 9 | (2) 256K x 9 | 
| 2MB | NONE | NONE | NONE | NONE | (2) 1M x 9 | NONE | 
| 3MB | (4) 44256 | (2) 41256 | (4) 44256 | (2) 41256 | (2) 1M x 9 | NONE | 
| 4MB | NONE | NONE | NONE | NONE | (2) 1M x 9 | (2) 1M x 9 | 
| 5MB | (4) 44256 | (2) 41256 | (4) 44256 | (2) 41256 | (2) 1M x 9 | (2) 1M x 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 |