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# ACER, INC.
ISA486GSi MODEL IP25A
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/50(internal)/66(internal)
Chip Set ALI
Max. Onboard DRAM 32MB
SRAM Cache None
BIOS Acer
Dimensions 220mm x 220mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+-----------+--------------+-----------|
| External battery | J3 | Reset switch | J4/11 & |
| | | | 12 |
|---------------------+-----------+--------------+-----------|
| Power LED & keylock | J4/1 - 5 | Turbo switch | J4/14 - |
| | | | 16 |
|---------------------+-----------+--------------+-----------|
| Speaker | J4/7 - 10 | Turbo LED | J4/18 & |
| | | | 19 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------+--------+----------------|
| » | CMOS memory normal operation | JP1 | open |
|---+------------------------------+--------+----------------|
| | CMOS memory clear | JP1 | closed |
|---+------------------------------+--------+----------------|
| » | Battery select internal | J3 | pins 2 & 3 |
| | | | closed |
|---+------------------------------+--------+----------------|
| | Battery select external | J3 | connected |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU | JP6 | JP7 |
|------------------+--------------------+--------------------|
| 80486DX2 | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| ODP486SX | open | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80486DX | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80487SX | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80486SX | open | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU | OSC1 | JP8 | JP9 | JP10 | JP11 |
| Speed | | | | | |
|----------+-------+----------+----------+---------+---------|
| 20MHz | 40MHz | pins 2 & | pins 1 & | pins 1 | pins 2 |
| | | 3 | 2 | & 2 | & 3 |
|----------+-------+----------+----------+---------+---------|
| 25MHz | 50MHz | pins 1 & | pins 2 & | pins 1 | pins 2 |
| | | 2 | 3 | & 2 | & 3 |
|----------+-------+----------+----------+---------+---------|
| 33MHz | 66MHz | pins 1 & | pins 1 & | pins 1 | pins 2 |
| | | 2 | 2 | & 2 | & 3 |
|----------+-------+----------+----------+---------+---------|
| 50MHz | 50MHz | pins 1 & | pins 2 & | pins 1 | pins 2 |
| | | 2 | 3 | & 2 | & 3 |
|----------+-------+----------+----------+---------+---------|
| 60MHz | 66MHz | pins 1 & | pins 1 & | pins 1 | pins 2 |
| | | 2 | 2 | & 2 | & 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+