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# TEXAS MICROSYSTEMS, INC.
PS486
Processor 80486SX/80486DX/80486DX2/80486DX4/P24D/P24T
Processor Speed 33/66(internal)/100(internal)MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 128MB
Memory
Maximum Video None
Memory
Cache 128/256KB
BIOS Phoenix
Dimensions 337mm x 122mm
I/O Options AUI connector, floppy drive interface, IDE
interface, SCSI interface, parallel port,
PS/2 mouse port, serial ports (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| SCSI interface | CN1 | PS/2 mouse port | CN7 |
|-------------------+----------+------------------+----------|
| IDE interface | CN2 | AUI connector | CN8 |
|-------------------+----------+------------------+----------|
| Floppy drive | CN3 | AT keyboard | CN9 |
| interface | | connector | |
|-------------------+----------+------------------+----------|
| Parallel port | CN4 | AUI receive LED | JP4 |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN5 | AUI active link | JP5 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN6 | Hard drive LED | JP7 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Parity select DPU generation | JP2 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Parity select CPU generation | JP2 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | SCSI speed select 33MHz | JP8 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | SCSI speed select 40MHz | JP8 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Watchdog timer enabled | JP16 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Watchdog timer disabled | JP16 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | PS/2 IRQ 12 enabled | JP17 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Next Step OS used | JP17 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | PCI bus speed select 33MHz | JP23 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | PCI bus speed select 25MHz | JP23 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP27 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Monitor type select color | SW1/1 | On |
|---+---------------------------------+-------+--------------|
| | Monitor type select monochrome | SW1/1 | Off |
|---+---------------------------------+-------+--------------|
| » | Flash BIOS enabled | SW1/2 | On |
|---+---------------------------------+-------+--------------|
| | Flash BIOS disabled | SW1/2 | Off |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | SW1/3 | Off |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | SW1/3 | On |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | SW1/4 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Note: The location of the cache is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP24 | JP25 |
|-------------------+--------------------+-------------------|
| 128KB | Open | Open |
|-------------------+--------------------+-------------------|
| 256KB | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP1 | JP14 | JP15 | JP18 |
|----------+------------+------------+-----------+-----------|
| 80486SX | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & | Pins 1 & |
| | closed | closed | 3 closed | 2 closed |
|----------+------------+------------+-----------+-----------|
| 80846DX | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & | Pins 2 & |
| | closed | closed | 3 closed | 3 closed |
|----------+------------+------------+-----------+-----------|
| 80486DX2 | Pins 1 & 2 | Pins 2 & 3 | Pins 2 & | Pins 2 & |
| | closed | closed | 3 closed | 3 closed |
|----------+------------+------------+-----------+-----------|
| 80486DX4 | Pins 1 & 2 | Pins 2 & 3 | Pins 2 & | Pins 2 & |
| | closed | closed | 3 closed | 3 closed |
|----------+------------+------------+-----------+-----------|
| P24D | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & | Pins 2 & |
| | closed | closed | 2 closed | 3 closed |
|----------+------------+------------+-----------+-----------|
| P24T | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & | Pins 2 & |
| | closed | closed | 2 closed | 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP22 |
|-----------------------------+------------------------------|
| Non SL enhanced | Pins 1 & 2 closed |
|-----------------------------+------------------------------|
| SL enhanced | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CACHE SELECTION |
|------------------------------------------------------------|
| CPU | Cache | JP6 | JP12 | JP19 |
|----------+-------+-------------------+------------+--------|
| 80486SX | WT/WT | Pins 5 & 6 closed | Pins 2 & 3 | Closed |
| | | | closed | |
|----------+-------+-------------------+------------+--------|
| 80486SX | WT/WB | Pins 1 & 2 closed | Pins 1 & 2 | Open |
| | | | closed | |
|----------+-------+-------------------+------------+--------|
| 80846DX | WT/WT | Pins 5 & 6 closed | Pins 2 & 3 | Closed |
| | | | closed | |
|----------+-------+-------------------+------------+--------|
| 80846DX | WT/WB | Pins 1 & 2 closed | Pins 1 & 2 | Open |
| | | | closed | |
|----------+-------+-------------------+------------+--------|
| 80486DX2 | WT/WT | Pins 5 & 6 closed | Pins 2 & 3 | Closed |
| | | | closed | |
|----------+-------+-------------------+------------+--------|
| 80486DX2 | WT/WB | Pins 1 & 2 closed | Pins 1 & 2 | Open |
| | | | closed | |
|----------+-------+-------------------+------------+--------|
| 80486DX4 | WT/WB | Pins 5 & 6 closed | Pins 2 & 3 | Closed |
| | | | closed | |
|----------+-------+-------------------+------------+--------|
| P24D | WB/WT | Pins 5 & 6 closed | Pins 1 & 2 | Closed |
| | | | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU MULTIPLIER SELECTION |
|------------------------------------------------------------|
| Multiplier | JP13 |
|----------------------------+-------------------------------|
| 2x | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3x | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 SELECTION |
|------------------------------------------------------------|
| Setting | JP9 | JP10 | JP11 |
|-----------+----------------+---------------+---------------|
| » | 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 |
+------------------------------------------------------------+