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# TEXAS MICROSYSTEMS, INC.
LS486/L486
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 33/50(internal)/66(internal)MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard 32MB
Memory
Maximum Video None
Memory
Cache None
BIOS Unidentified
Dimensions Unidentified
I/O Options Floppy drive interface, IDE interface, SCSI
interface, parallel port, serial ports (2),
video board connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| SCSI interface | J1 | Auxiliary keyboard | J7 |
| | | connector | |
|-----------------+----------+--------------------+----------|
| IDE interface | J2 | External battery | JP4 |
|-----------------+----------+--------------------+----------|
| Floppy drive | J3 | Hard drive LED | JP5 |
| interface | | | |
|-----------------+----------+--------------------+----------|
| Serial port 2 | J4 | Video board | JP9 |
| | | connector | |
|-----------------+----------+--------------------+----------|
| Serial port 1 | J5 | Texas Micro | JP11 |
| | | keyboard connector | |
|-----------------+----------+--------------------+----------|
| Parallel port | J6 | Video board | JP13 |
| | | connector | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|------------------------------------+-------+---------------|
| » | Battery type select internal | JP4 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Battery type select external | JP4 | Closed |
|---+--------------------------------+-------+---------------|
| » | Watchdog timer disabled | JP12 | Pins 2 & 3 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Watchdog timer enabled | JP12 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | On board SCSI enabled | JP15 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | On board SCSI disabled | JP15 | Pins 2 & 3 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| » | Monitor type select color | SW1/1 | On |
|---+--------------------------------+-------+---------------|
| | Monitor type select monochrome | SW1/1 | Off |
|---+--------------------------------+-------+---------------|
| » | Flash BIOS enabled | SW1/2 | Off |
|---+--------------------------------+-------+---------------|
| | Flash BIOS 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (1) 256K x 36 | None |
|------------------+--------------------+--------------------|
| 2MB | (1) 256K x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 4MB | (1) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 5MB | (1) 1M x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 4M x 36 | None |
|------------------+--------------------+--------------------|
| 17MB | (1) 4M x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP1 | JP2 | JP3 |
|----------+----------------+----------------+---------------|
| 80486SX | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| 80487SX | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| 80486DX | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| 80486DX2 | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (80486SX ONLY) |
|------------------------------------------------------------|
| Multiplier | JP10 |
|----------------------------+-------------------------------|
| PQFP | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| PGA | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 SELECTION |
|------------------------------------------------------------|
| Setting | JP6 | JP7 | JP8 |
|-----------+----------------+---------------+---------------|
| » | RS232 | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | | closed | closed | closed |
|---+-------+----------------+---------------+---------------|
| | RS422 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | | closed | closed | closed |
|---+-------+----------------+---------------+---------------|
| | RS485 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| WATCHDOG TIMER SELECTION |
|------------------------------------------------------------|
| Timer | JP14 |
|-----------------------------+------------------------------|
| » | 1.2 seconds | Pins 1 & 2 closed |
|---+-------------------------+------------------------------|
| | 150ms | Pins 2 & 3 closed |
|---+-------------------------+------------------------------|
| | 600ms | Open |
+------------------------------------------------------------+