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# UNIDENTIFIED
PMS486DS
Processor 80486DX
Processor Speed 20/25/33/50MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache 64/128/256/512KB
BIOS AMI
Dimensions 330.2mm x 218.4mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J3 | Speaker | J18 |
|------------------+----------+-------------------+----------|
| Turbo switch | J16 | Power LED & | J19 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Reset switch | J17 | Turbo LED | J20 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | CMOS memory normal operation | J4 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | J4 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | J5 | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | J5 | open |
|---+--------------------------------+--------+--------------|
| » | CPU speed select iOSC/2 | J9 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CPU speed select iOSC | J9 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Bus speed select ATCLK/6 | J10 | closed |
|---+--------------------------------+--------+--------------|
| | Bus speed select ATCLK/4 | J10 | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | Location | TAG (U42) | TAG (U55) |
| | CACHE | | | |
|-------+------------+-------------+------------+------------|
| 64KB | (8) 8K x 8 | Bank 0 | (1) 64K x | (1) 8K x 8 |
| | | | 1 | |
|-------+------------+-------------+------------+------------|
| 128KB | (16) 8K x | Banks 0 & 1 | (1) 64K x | (1) 8K x 8 |
| | 8 | | 1 | |
|-------+------------+-------------+------------+------------|
| 256KB | (8) 32K x | Bank 0 | (1) 64K x | (1) 32K x |
| | 8 | | 1 | 8 |
|-------+------------+-------------+------------+------------|
| 512KB | (16) 32K x | Banks 0 & 1 | (1) 64K x | (1) 32K x |
| | 8 | | 1 | 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J11 | J12 | J13 | J14 | J15 |
|-------+--------+--------+--------+--------+----------------|
| 64KB | open | open | open | open | pins 2 & 3 |
| | | | | | closed |
|-------+--------+--------+--------+--------+----------------|
| 128KB | open | open | closed | closed | pins 2 & 3 |
| | | | | | closed |
|-------+--------+--------+--------+--------+----------------|
| 256KB | open | closed | closed | closed | pins 2 & 3 |
| | | | | | closed |
|-------+--------+--------+--------+--------+----------------|
| 512KB | closed | closed | closed | closed | pins 1 & 2 |
| | | | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU JUMPER CONFIGURATION |
|------------------------------------------------------------|
| CPU | J6 | J7 | J8 |
|---------+-------------------+----------+-------------------|
| 80486DX | pins 1 & 2 closed | closed | pins 2 & 3 closed |
|---------+-------------------+----------+-------------------|
| 80487SX | pins 2 & 3 closed | closed | pins 2 & 3 closed |
|---------+-------------------+----------+-------------------|
| 80486SX | open | open | pins 1 & 2 closed |
+------------------------------------------------------------+