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# ATEN RESEARCH, INC.
486DX/486SX CACHE MAINBOARD
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set UNI
Max. Onboard DRAM 128MB
Cache 32/64/128/256KB
BIOS Award
Dimensions 330mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | JP1 | Turbo LED | JP16 |
|------------------+----------+-------------------+----------|
| Reset switch | JP14 | Speaker | JP17 |
|------------------+----------+-------------------+----------|
| Turbo switch | JP15 | Power LED & | JP18 |
| | | keylock | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CMOS memory normal operation | JP2 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP2 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | CPU speed (external) select | JP3 | pins 1 & 2 |
| | 16/20/25/33/40MHz | | closed |
|---+----------------------------------+--------+------------|
| | CPU speed (external) select | JP3 | pins 2 & 3 |
| | 50MHz | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP12 | open |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP12 | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Jumper | JP7 | JP9 | JP13 |
|----------+------------+-----------------------+------------|
| 80486DX2 | pins 1 & 2 | pins 1 & 2 and 3 & 4 | pins 1 & 2 |
| | closed | closed | closed |
|----------+------------+-----------------------+------------|
| 80486DX | pins 1 & 2 | pins 1 & 2 and 3 & 4 | pins 1 & 2 |
| | closed | closed | closed |
|----------+------------+-----------------------+------------|
| 80487SX | pins 2 & 3 | pins 1 & 2 and 3 & 4 | pins 1 & 2 |
| | closed | closed | closed |
|----------+------------+-----------------------+------------|
| 80486SX | open | pins 2 & 3 closed | 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 |
|-----------+------------------------+-----------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|-----------+------------------------+-----------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|-----------+------------------------+-----------------------|
| 16MB | (4) 4M x 9 | NONE |
|-----------+------------------------+-----------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|-----------+------------------------+-----------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|-----------+------------------------+-----------------------|
| 64MB | (4) 16M x 9 | NONE |
|-----------+------------------------+-----------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Jumper | 32KB | 64KB | 128KB | 256KB |
|--------+------------+------------+------------+------------|
| JP22 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| JP23 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| JP25 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| JP26 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| JP27 | closed | open | open | open |
|--------+------------+------------+------------+------------|
| JP28 | open | closed | open | open |
|--------+------------+------------+------------+------------|
| JP29 | open | open | closed | open |
|--------+------------+------------+------------+------------|
| JP30 | open | open | open | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache SRAM | Location | TAG |
|------------+---------------+---------------+---------------|
| 32KB | (4) 8K x 8 | Bank 0 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 32K x 8 |
+------------------------------------------------------------+