TEXT View Source
# UNIDENTIFIED
COMPASS-486DX
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 25/33/50(internal)/66(internal)MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | J9 | Turbo switch | JP10 |
|---------------------+----------+----------------+----------|
| Speaker | J18 | Turbo LED | JP11 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J19 | Reset switch | SW1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+--------+-------------|
| ยป | CMOS memory normal operation | JP1 | pins 2 & 3 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| | CMOS memory clear | JP1 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| | Monitor type select monochrome | JP2 | Open |
|---+---------------------------------+--------+-------------|
| | Monitor type select color | JP2 | Closed |
|---+---------------------------------+--------+-------------|
| | Clock phase select double phase | JP4 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| | Clock phase select single phase | JP4 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG 0 | TAG 1 |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | NONE | (1) 8K x 8 |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | NONE | NONE | (1) 8K x 8 |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 8K x 8 | (1) 8K x 8 |
| | | 8 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 | JP5 | JP6 | JP7 | JP8 | JP9 |
|-------+-------+--------+--------+--------+--------+--------|
| 64KB | 2 & 3 | Open | Open | Open | Open | Open |
|-------+-------+--------+--------+--------+--------+--------|
| 128KB | 1 & 2 | Open | Open | Closed | Closed | Closed |
|-------+-------+--------+--------+--------+--------+--------|
| 256KB | 2 & 3 | Closed | Closed | Closed | Closed | Closed |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP12 | JP13 | JP14 |
|-----------+-------------------+-------------------+--------|
| 80486SX | pins 2 & 3 closed | Open | Open |
|-----------+-------------------+-------------------+--------|
| 80487SX | pins 1 & 2 closed | pins 2 & 3 closed | Closed |
|-----------+-------------------+-------------------+--------|
| 80486DX | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
|-----------+-------------------+-------------------+--------|
| 80486DX2 | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| Note: The location of pin 1 is unidentified. |
+------------------------------------------------------------+