TEXAS MICRO, INC.
L386SX CPU (REV. B)
| Device Type | Single board computer | 
| Processor | AM386SX/80386SX | 
| Processor Speed | Unidentified | 
| Chip Set | Unidentified | 
| Video Chip Set | Unidentified | 
| Maximum Onboard Memory | 16MB | 
| Maximum Video Memory | Unidentified | 
| Cache | 64KB | 
| BIOS | Unidentified | 
| Dimensions | 338mm x 122mm | 
| I/O Options | Floppy drive interface, IDE interface, parallel port, serial ports (2) | 
| NPU options | 80387SX | 

| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Serial port 1 | CN1 | External battery | JP1 | 
| Parallel port | CN2 | IDE interface LED | JP7 | 
| Keyboard connector | CN3 | Auxiliary keyboard connector | JP12 | 
| IDE interface | J1 | Video board connector | JP14 | 
| Floppy drive interface | J2 | Video board connector | JP16 | 
| Serial port 2 | J3 | 
 | 
 | 
| USER CONFIGURABLE SETTINGS | |||
| Function | Label | Position | |
| 
 | On board battery enabled | JP1 | Pins 1 & 2 closed | 
| 
 | On board battery disabled | JP1 | Pins 2 & 3 closed | 
| 
 | Watchdog timer enabled | JP13 | Pins 1 & 2 closed | 
| 
 | Watchdog timer disabled | JP13 | Pins 2 & 3 closed | 
| » | Factory configured - do not alter | JP17 | Pins 2 & 3 closed | 
| » | Factory configured - do not alter | JP18 | Pins 2 & 3 closed | 
| » | Factory configured - do not alter | JP19 | Open | 
| » | Factory configured - do not alter | JP20 | Pins 1 & 2 closed | 
| » | Factory configured - do not alter | JP21 | Pins 1 & 2 closed | 
| » | Monitor type select color | SW1/1 | On | 
| 
 | Monitor type select monochrome | SW1/1 | Off | 
| 
 | Flash memory enabled | SW1/2 | Off | 
| 
 | Flash memory disabled | SW1/2 | On | 
| » | CMOS memory normal operation | SW1/3 | Off | 
| 
 | CMOS memory clear | SW1/3 | On | 
| 
 | I/O address select 270H | SW1/4 | Off | 
| 
 | I/O address select 370H | SW1/4 | On | 
| Note: The location of JP19, JP20 & JP21 are unidentified. | |||
| SIMM CONFIGURATION | ||
| Size | Bank 0 | Bank 1 | 
| 1MB | (2) 256K x 9 | (2) 256K x 9 | 
| 2MB | (2) 1M x 9 | None | 
| 4MB | (2) 1M x 9 | (2) 1M x 9 | 
| 8MB | (2) 4M x 9 | None | 
| 16MB | (2) 4M x 9 | (2) 4M x 9 | 
| CACHE CONFIGURATION | 
| Note: The location of the cache is unidentified. | 
| CACHE JUMPER CONFIGURATION | |||||
| Size | JP2 | JP3 | JP4 | JP5 | JP6 | 
| 64KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 
| VIDEO MEMORY CONFIGURATION | 
| Note: The location of the video memory is unidentified. | 
| SERIAL PORT SELECTION | ||||
| Setting | JP8 | JP9 | JP10 | |
| » | RS-232 | Pins 2 & 3 closed | Pins 2 & 3 closed | Pins 2 & 3 closed | 
| 
 | RS-422 | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | 
| 
 | RS-485 | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | 
| WATCHDOG SELECTION | |
| Seconds | JP15 | 
| » 1.2 seconds | Pins 1 & 2 closed | 
| 150ms | Pins 2 & 3 closed | 
| 600ms | Open |