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# TEXAS MICROSYSTEMS, INC.
D486 (REL. 2)
Processor 80486DX/80486DX2/80486DX4
Processor Speed 33/50/66(internal)/100(internal)MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard 128MB
Memory
Maximum Video None
Memory
Cache 64/128/256KB
BIOS Unidentified
Dimensions Unidentified
I/O Options Floppy drive interface, IDE interface,
parallel port, serial ports (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| IDE interface | CN1 | Parallel port | CN5 |
|-------------------+----------+------------------+----------|
| Floppy drive | CN2 | AT keyboard | CN6 |
| interface | | connector | |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN3 | External battery | JP9 |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN4 | IDE interface | JP10 |
| | | LED | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|------------------------------------+-------+---------------|
| » | Battery type select internal | JP9 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Battery type select external | JP9 | Closed |
|---+--------------------------------+-------+---------------|
| » | Watchdog timer disabled | JP11 | Pins 2 & 3 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Watchdog timer enabled | JP11 | Pins 1 & 2 |
| | | | 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 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 36 | None |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 4M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 36 | None |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
|------------------------------------------------------------|
| Note: Board also accepts x 32 SIMMs. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Note: The chip sizes and location of the cache is |
| unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP5 | JP6 | JP7 | JP8 |
|-------+-------------+------------+------------+------------|
| 64KB | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 | Open |
| | closed | closed | closed | |
|-------+-------------+------------+------------+------------|
| 128KB | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 256KB | Pins 2 & 3 | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP4 |
|----------------------------+-------------------------------|
| 33MHz | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP1 | JP2 | JP3 | JP14 |
|----------+------------+------------+-----------+-----------|
| 80486DX | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & | Pins 2 & |
| | closed | closed | 2 closed | 3 closed |
|----------+------------+------------+-----------+-----------|
| 80486DX2 | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & | Pins 2 & |
| | closed | closed | 2 closed | 3 closed |
|----------+------------+------------+-----------+-----------|
| 80486DX4 | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & | Pins 1 & |
| | closed | closed | 2 closed | 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU MULTIPLIER SELECTION (80486DX4 ONLY) |
|------------------------------------------------------------|
| Multiplier | JP13 |
|----------------------------+-------------------------------|
| 2x | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3x | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| WATCHDOG TIMER SELECTION |
|------------------------------------------------------------|
| Timer | JP12 |
|-----------------------------+------------------------------|
| » | 150ms | Pins 2 & 3 closed |
|---+-------------------------+------------------------------|
| | 600ms | Open |
|---+-------------------------+------------------------------|
| | 1.2 seconds | Pins 1 & 2 closed |
+------------------------------------------------------------+