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  |