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# ACER, INC.
ISA486GXi MODEL I433A
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/50(internal)/66(internal)
Chip Set ALI
Max. Onboard DRAM 32MB
SRAM Cache 64/256KB
BIOS Acer
Dimensions 220mm x 240mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+-----------+--------------+-----------|
| External battery | JP5 | Turbo LED | JP16/12 & |
| | | | 13 |
|---------------------+-----------+--------------+-----------|
| Power LED & keylock | JP16/1 - | Turbo switch | JP16/15 - |
| | 5 | | 17 |
|---------------------+-----------+--------------+-----------|
| Speaker | JP16/7 - | Reset switch | JP16/19 & |
| | 10 | | 20 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | TAG | (U36) | JP10 | JP11 | JP12 |
|-------+--------+-------+--------+--------+--------+--------|
| 64KB | (8) 8K | (1) | (1) | open | pins 2 | pins 1 |
| | x 8 | 8K x | 16K x | | & 3 | & 2 |
| | | 8 | 4 | | | |
|-------+--------+-------+--------+--------+--------+--------|
| 64KB | (8) 8K | (1) | NONE | open | pins 1 | pins 2 |
| | x 8 | 8K x | | | & 2 | & 3 |
| | | 8 | | | | |
|-------+--------+-------+--------+--------+--------+--------|
| 256KB | (8) | (1) | (1) | closed | pins 2 | pins 1 |
| | 32K x | 32K x | 16K x | | & 3 | & 2 |
| | 8 | 8 | 4 | | | |
|-------+--------+-------+--------+--------+--------+--------|
| 256KB | (8) | (1) | NONE | closed | pins 1 | pins 2 |
| | 32K x | 32K x | | | & 2 | & 3 |
| | 8 | 8 | | | | |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
| |
| JP10 is closed by shorting pins 1 & 2, 3 & 4, and 5 & 6. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CMOS memory normal operation | JP6 | open |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP6 | closed |
|---+----------------------------------+--------+------------|
| | System automatically detects CPU | JP7 | closed |
| | type installed | | |
|---+----------------------------------+--------+------------|
| | System detects only 486SX/DX | JP7 | open |
| | CPUs | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP8 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP13 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP17 | open |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 2MB | (4) 512K x 9 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (4) 512K x 9 | (4) 512K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 6MB | (4) 512K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 18MB | (4) 512K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION FOR CH9001 SYSTEM CLOCK CHIP |
|------------------------------------------------------------|
| CPU Speed | JP1 | JP9 |
|------------+---------------------------+-------------------|
| 20MHz | pins 1 & 2 closed | pins 2 & 3 closed |
|------------+---------------------------+-------------------|
| 25MHz | open | pins 2 & 3 closed |
|------------+---------------------------+-------------------|
| 33MHz | pins 3 & 4 closed | pins 2 & 3 closed |
|------------+---------------------------+-------------------|
| 40MHz | pins 1 & 2 and 5 & 6 | pins 1 & 2 closed |
| | closed | |
|------------+---------------------------+-------------------|
| 50MHz | pins 5 & 6 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION FOR IMISC425 SYSTEM CLOCK CHIP |
|------------------------------------------------------------|
| CPU Speed | JP1 | JP9 |
|-----------+----------------------------+-------------------|
| 20MHz | pins 1 & 2 and 3 & 4 | pins 2 & 3 closed |
| | closed | |
|-----------+----------------------------+-------------------|
| 25MHz | pins 3 & 4 closed | pins 2 & 3 closed |
|-----------+----------------------------+-------------------|
| 33MHz | pins 1 & 2 closed | pins 2 & 3 closed |
|-----------+----------------------------+-------------------|
| 40MHz | pins 1 & 2, 3 & 4, and 5 & | pins 1 & 2 closed |
| | 6 closed | |
|-----------+----------------------------+-------------------|
| 50MHz | pins 5 & 6 closed | pins 1 & 2 closed |
+------------------------------------------------------------+