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# ARNOS INSTRUMENTS & COMPUTER SYSTEMS, INC.
A486-25/33/50C
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 25/33/50(internal)/50/66(internal)MHz
Chip Set AIC
Max. Onboard DRAM 64MB
Cache 64/128/256/512/1024KB
BIOS AMI/Phoenix
Dimensions 264mm x 219mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | X8 | Turbo switch | X15 |
|------------------+----------+-------------------+----------|
| Reset switch | X13 | Speaker | X16 |
|------------------+----------+-------------------+----------|
| Turbo LED | X14 | Power LED & | X17 |
| | | keylock | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Battery select internal | S3 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery select external | S3 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Battery type select 5VDC or less | S4 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select greater than | S4 | pins 2 & 3 |
| | 5VDC | | closed |
|---+----------------------------------+--------+------------|
| » | External cache enabled | S5 | open |
|---+----------------------------------+--------+------------|
| | External cache disabled | S5 | closed |
|---+----------------------------------+--------+------------|
| » | CPU speed select iOSC/2 | S7 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU speed select iOSC/1 | S7 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | S8 | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | S8 | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | S6 | S9 |
|----------+-------------------+-----------------------------|
| 80486DX2 | pins 1 & 2 closed | pins 1 & 2 and 3 & 4 closed |
|----------+-------------------+-----------------------------|
| 80486DX | pins 1 & 2 closed | pins 1 & 2 and 3 & 4 closed |
|----------+-------------------+-----------------------------|
| 80487SX | pins 2 & 3 closed | pins 1 & 2 and 3 & 4 closed |
|----------+-------------------+-----------------------------|
| 80486SX | open | 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 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | S1 | S2 | S10 | S12 | S13 |
|--------+----------+----------+---------+---------+---------|
| 64KB | pins 1 & | pins 1 & | pins 1 | pins 1 | pins 1 |
| | 2 | 2 | & 2 | & 2 | & 2 |
|--------+----------+----------+---------+---------+---------|
| 128KB | pins 2 & | pins 1 & | pins 2 | pins 1 | pins 2 |
| | 3 | 2 | & 3 | & 2 | & 3 |
|--------+----------+----------+---------+---------+---------|
| 256KB | pins 2 & | pins 1 & | pins 2 | pins 2 | pins 1 |
| | 3 | 2 | & 3 | & 3 | & 2 |
|--------+----------+----------+---------+---------+---------|
| 512KB | pins 2 & | pins 2 & | pins 2 | pins 2 | pins 1 |
| | 3 | 3 | & 3 | & 3 | & 2 |
|--------+----------+----------+---------+---------+---------|
| 1024KB | pins 2 & | pins 2 & | pins 2 | pins 2 | pins 2 |
| | 3 | 3 | & 3 | & 3 | & 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | Location | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | Banks 0 & 1 | (2) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | Bank 0 | (2) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | Banks 0 & 1 | (2) 32K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | Bank 0 | (2) 32K x 8 |
|------------+---------------+---------------+---------------|
| 1024KB | (8) 128K x 8 | Banks 0 & 1 | (2) 128K x 8 |
+------------------------------------------------------------+