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# UNIDENTIFIED
486-EL
Processor 80486SX/80486DX/80486DX2/80486DX4
Processor 25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set OPTI
Max. 16MB
Onboard
DRAM
Cache 8KB (on EDRAM modules)
BIOS AMI
Dimensions 250mm x 220mm
I/O 32-bit VESA local bus slots (3), green PC connector
Options
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| External battery | JP2 | Reset switch | JP27 |
|--------------------+----------+-----------------+----------|
| Green PC connector | JP3 | Power LED & | JP28 |
| | | keylock | |
|--------------------+----------+-----------------+----------|
| Turbo LED | JP25 | Speaker | JP30 |
|--------------------+----------+-----------------+----------|
| Turbo switch | JP26 | 32-bit VESA | SL1 - |
| | | local bus slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| ยป | CMOS memory normal operation | JP1 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Green PC IRQ select IRQ10 | JP23 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Green PC IRQ select IRQ11 | JP23 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Green PC timer select short time | JP29 | Closed |
| | (1.5 minutes) | | |
|---+----------------------------------+--------+------------|
| | Green PC timer select long time | JP29 | Open |
| | (8 minutes) | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|----------+------------+------------+-----------+-----------|
| 4MB | 4MB | NONE | NONE | NONE |
|----------+------------+------------+-----------+-----------|
| 8MB | 4MB | 4MB | NONE | NONE |
|----------+------------+------------+-----------+-----------|
| 8MB | 8MB | NONE | NONE | NONE |
|----------+------------+------------+-----------+-----------|
| 12MB | 4MB | 4MB | 4MB | NONE |
|----------+------------+------------+-----------+-----------|
| 16MB | 4MB | 4MB | 4MB | 4MB |
|----------+------------+------------+-----------+-----------|
| 16MB | 8MB | NONE | 8MB | NONE |
|------------------------------------------------------------|
| Note: This board is only compatible with EDRAM modules. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Memory installed | Cache installed |
|------------------------------+-----------------------------|
| 4MB | 2KB |
|------------------------------+-----------------------------|
| 8MB | 4KB |
|------------------------------+-----------------------------|
| 8MB | 4KB |
|------------------------------+-----------------------------|
| 12MB | 6KB |
|------------------------------+-----------------------------|
| 16MB | 8KB |
|------------------------------+-----------------------------|
| 16MB | 8KB |
|------------------------------------------------------------|
| Note: Cache is located on EDRAM modules. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP19 | JP20 | JP21 |
|-----------+--------+-------------------+-------------------|
| 80486SX | Open | pins 1 & 2 closed | pins 1 & 2 closed |
|-----------+--------+-------------------+-------------------|
| 80486DX | Closed | pins 2 & 3 closed | pins 2 & 3 closed |
|-----------+--------+-------------------+-------------------|
| 80486DX2 | Closed | pins 2 & 3 closed | pins 2 & 3 closed |
|-----------+--------+-------------------+-------------------|
| 80486DX4 | Closed | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP9 | JP10 | JP36 |
|--------------+------------+------------+-------------------|
| 25MHz | Open | Closed | pins 1 & 2 closed |
|--------------+------------+------------+-------------------|
| 33MHz | Closed | Open | pins 1 & 2 closed |
|--------------+------------+------------+-------------------|
| 50iMHz | Open | Closed | pins 1 & 2 closed |
|--------------+------------+------------+-------------------|
| 66iMHz | Closed | Open | pins 1 & 2 closed |
|--------------+------------+------------+-------------------|
| 75iMHz | Open | Closed | pins 2 & 3 closed |
|--------------+------------+------------+-------------------|
| 100iMHz | Closed | Open | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80486DX4 ONLY) |
|------------------------------------------------------------|
| Speed | JP35 |
|----------------------------+-------------------------------|
| 2x | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 2.5x | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3x | Open |
+------------------------------------------------------------+