UNIDENTIFIED
386SX SYSTEM
| Processor | 80386SX | 
| Processor Speed | 16/25MHz | 
| Chip Set | Headland | 
| Video Chip Set | Trident | 
| Maximum Onboard Memory | 6MB | 
| Maximum Video Memory | 1MB | 
| Cache | None | 
| BIOS | Phoenix | 
| Dimensions | 396mm x 368mm | 
| I/O Options | Floppy drive interface, game port, IDE interface, parallel port, serial ports (2), VGA port, riser slot, modem/fax interface | 
| NPU Options | 80387SX | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Game port | CN1 | Modem/fax interface | J25 | 
| VGA port | CN2 | IDE interface | J27 | 
| Parallel port | CN3 | IDE interface LED | J28 | 
| Serial port 2 | CN4 | Floppy drive interface LED | J29 | 
| Serial port 1 | CN5 | Power LED | J30 | 
| Chassis fan power | J14 | Floppy drive interface | J31 | 
| Reset switch | J17 | Riser slot | SL1 | 
| Speaker | J21 | ||
| USER CONFIGURABLE SETTINGS | |||
| Function | Label | Position | |
| Game port enabled | J6 | Pins 1 & 2 closed | |
| Game port disabled | J6 | Pins 2 & 3 closed | |
| Serial port 2 enabled | J8 | Pins 1 & 2 closed | |
| Serial port 2 disabled | J8 | Pins 2 & 3 closed | |
| Parallel port enabled | J9 | Pins 1 & 2 closed | |
| Parallel port disabled | J9 | Pins 2 & 3 closed | |
| Serial port 2 address select 2F8 | J10 | Pins 1 & 2 closed | |
| Serial port 2 address select 2E8 | J10 | Pins 2 & 3 closed | |
| Parallel port address select 378 | J11 | Pins 1 & 2 closed | |
| Parallel port address select 278 | J11 | Pins 2 & 3 closed | |
| Serial port 1 enabled | J12 | Pins 1 & 2 closed | |
| Serial port 1 disabled | J12 | Pins 2 & 3 closed | |
| Serial port 1 address select 3F8 | J13 | Pins 1 & 2 closed | |
| Serial port 1 address select 3E8 | J13 | Pins 2 & 3 closed | |
| Monitor type select color | J15 | Pins 1 & 2 closed | |
| Monitor type select monochrome | J15 | Pins 2 & 3 closed | |
| Video mode select interlaced | J18 | Closed | |
| Video mode select non interlaced | J18 | Open | |
| NPU synchronous with CPU | J20 | Open | |
| NPU asynchronous with CPU | J20 | Closed | |
| IDE interface enabled | J23 | Pins 1 & 2 closed | |
| IDE interface disabled | J23 | Pins 2 & 3 closed | |
| Floppy drive interface enabled | J24 | Pins 1 & 2 closed | |
| Floppy drive interface disabled | J24 | Pins 2 & 3 closed | |
| DRAM CONFIGURATION | ||||
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | 
| 1MB | 512KB | 512KB | None | None | 
| 1.5MB | 512KB | 512KB | (2) 256K x 9 | None | 
| 2MB | 512KB | 512KB | (2) 256K x 9 | (2) 256K x 9 | 
| 3MB | 512KB | 512KB | (2) 1M x 9 | None | 
| 5MB | 512KB | 512KB | (2) 1M x 9 | (2) 1M x 9 | 
| 3MB | 1MB | None | (2) 256K x 9 | (2) 256K x 9 | 
| 4MB | 1MB | None | (2) 1M x 9 | None | 
| 6MB | 1MB | None | (2) 1M x 9 | (2) 1M x 9 | 
| Note: Bank 0 or banks 0 & 1 are factory installed and is not configurable. | ||||
| VIDEO MEMORY CONFIGURATION | ||||
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | 
| 256KB | (2) 44256 | None | None | None | 
| 512KB | (2) 44256 | (2) 44256 | None | None | 
| 1MB | (2) 44256 | (2) 44256 | (2) 44256 | (2) 44256 |