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# 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 16MB
Memory
Maximum Video Unidentified
Memory
Cache 64KB
BIOS Unidentified
Dimensions 338mm x 122mm
I/O Options Floppy drive interface, IDE interface,
parallel port, serial ports (2)
NPU options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Serial port 1 | CN1 | External battery | JP1 |
|---------------+----------+----------------------+----------|
| Parallel port | CN2 | IDE interface LED | JP7 |
|---------------+----------+----------------------+----------|
| Keyboard | CN3 | Auxiliary keyboard | JP12 |
| connector | | connector | |
|---------------+----------+----------------------+----------|
| IDE interface | J1 | Video board | JP14 |
| | | connector | |
|---------------+----------+----------------------+----------|
| Floppy drive | J2 | Video board | JP16 |
| interface | | connector | |
|---------------+----------+----------------------+----------|
| 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 | JP17 | Pins 2 & 3 |
| | alter | | closed |
|----+----------------------------------+-------+------------|
| » | Factory configured - do not | JP18 | Pins 2 & 3 |
| | alter | | closed |
|----+----------------------------------+-------+------------|
| » | Factory configured - do not | JP19 | Open |
| | alter | | |
|----+----------------------------------+-------+------------|
| » | Factory configured - do not | JP20 | Pins 1 & 2 |
| | alter | | closed |
|----+----------------------------------+-------+------------|
| » | Factory configured - do not | JP21 | Pins 1 & 2 |
| | alter | | 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 | Pins 2 & 3 | Pins 2 & 3 |
| | | closed | closed | closed |
|---+--------+---------------+---------------+---------------|
| | RS-422 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | | closed | closed | closed |
|---+--------+---------------+---------------+---------------|
| | RS-485 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| WATCHDOG SELECTION |
|------------------------------------------------------------|
| Seconds | JP15 |
|----------------------------+-------------------------------|
| » 1.2 seconds | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 150ms | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 600ms | Open |
+------------------------------------------------------------+