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# TEXAS MICROSYSTEMS, INC.
P575/90
Processor Pentium
Processor Speed 90/100MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 128MB
Memory
Maximum Video None
Memory
Cache 256/512KB
BIOS Phoenix
Dimensions 337mm x 122mm
I/O Options Floppy drive interface, IDE interface, SCSI
interface, parallel port, serial ports (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| SCSI interface | CN1 | Serial port 1 | CN6 |
|--------------------+----------+-----------------+----------|
| IDE interface | CN2 | Parallel port | CN7 |
|--------------------+----------+-----------------+----------|
| Floppy drive | CN3 | AT keyboard | CN8 |
| interface | | connector | |
|--------------------+----------+-----------------+----------|
| Optional keyboard | CN4 | Hard drive LED | JP15 |
| connector | | | |
|--------------------+----------+-----------------+----------|
| Serial port 2 | CN5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Cache type select write back | JP1 | Open |
|---+---------------------------------+-------+--------------|
| | Cache type select write through | JP1 | Closed |
|---+---------------------------------+-------+--------------|
| » | Pipeline mode enabled | JP2 | Closed |
|---+---------------------------------+-------+--------------|
| | Pipeline mode disabled | JP2 | Open |
|---+---------------------------------+-------+--------------|
| » | Watchdog timer enabled | JP4 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Watchdog timer disabled | JP4 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP5 | Pins 2 & 3 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP6 | Pins 2 & 3 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP7 | Pins 2 & 3 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP8 | Pins 2 & 3 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Cache type select burst | JP10 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Cache type select standard | JP10 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | SCSI speed select 40MHz | JP13 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | SCSI speed select 33MHz | JP13 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | PS/2 IRQ 12 enabled | JP14 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Next Step OS used | JP14 | 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 |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | SW1/4 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M 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 |
|------------------+--------------------+--------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 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 |
|------------------+--------------------+--------------------|
| 72MB | (2) 8M x 36 | (2) 1M 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 | JP9 | JP11 | JP12 |
|-------+-----------------+-----------------+----------------|
| None | N/A | Pins 1 & 2 | Pins 1 & 2 |
| | | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 512KB | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP3 |
|------------------------------+-----------------------------|
| 1/2 | Closed |
|------------------------------+-----------------------------|
| 2/3 | Open |
+------------------------------------------------------------+