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# ACER, INC.
486 SYSTEM
Processor 80486SX/80486DX/80486DX2
Processor 25/33/50(internal)/66(internal)MHz
Speed
Chip Set Intel
Max. Onboard 36MB
DRAM
Cache 64/128/256KB
BIOS Phoenix
Dimensions 330mm x 218mm
I/O Options 32-bit riser card, floppy drive interface, IDE
interface, parallel port, PS/2 mouse port, serial
ports (2), VGA feature connector, VGA port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| VESA control | C1 | Floppy drive | CN8 |
| PAL chips | | interface | |
|-----------------+----------+--------------------+----------|
| VGA port | CN1 | IDE interface | CN9 |
|-----------------+----------+--------------------+----------|
| Parallel port | CN2 | VGA feature | CN10 |
| | | connector | |
|-----------------+----------+--------------------+----------|
| Serial port 1 | CN3 | Multifunction | CN11 |
| | | connector | |
|-----------------+----------+--------------------+----------|
| Serial port 2 | CN4 | Reset switch | CN12 |
|-----------------+----------+--------------------+----------|
| PS/2 mouse port | CN5 | IDE interface LED | CN13 |
|-----------------+----------+--------------------+----------|
| Power | CN6 | EPA power saving | CN14 |
| controller box | | relay | |
| connector | | | |
|-----------------+----------+--------------------+----------|
| Power saving | CN7 | Riser Card | SL1 |
| controller | | | |
| connector | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CMOS memory normal operation | J2 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | J2 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | On board battery enabled | J13 | Closed |
|---+----------------------------------+--------+------------|
| | On board battery disabled | J13 | Open |
|---+----------------------------------+--------+------------|
| » | DRAM parity disabled | J14 | Closed |
|---+----------------------------------+--------+------------|
| | DRAM parity enabled | J14 | Open |
|---+----------------------------------+--------+------------|
| » | On board VGA enabled | J20 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | On board VGA disabled | J20 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Keylock disabled | J27 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Keylock enabled | J27 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | On board memory enabled | J28 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | On board memory disabled | J28 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Floppy/hard drive controller | J29 | Closed |
| | enabled | | |
|---+----------------------------------+--------+------------|
| | Floppy/hard drive controller | J29 | Open |
| | disabled | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|---------+--------------+-------------------+---------------|
| 4MB | (4) 44256 | NONE | NONE |
|---------+--------------+-------------------+---------------|
| 8MB | (4) 44256 | (1) 1M x 36 | NONE |
|---------+--------------+-------------------+---------------|
| 12MB | (4) 44256 | (1) 1M x 36 | (1) 1M x 36 |
|---------+--------------+-------------------+---------------|
| 12MB | (4) 44256 | (1) 2M x 36 | NONE |
|---------+--------------+-------------------+---------------|
| 16MB | (4) 44256 | (1) 1M x 36 | (1) 2M x 36 |
|---------+--------------+-------------------+---------------|
| 20MB | (4) 44256 | (1) 4M x 36 | NONE |
|---------+--------------+-------------------+---------------|
| 20MB | (4) 44256 | (1) 2M x 36 | (1) 2M x 36 |
|---------+--------------+-------------------+---------------|
| 24MB | (4) 44256 | (1) 1M x 36 | (1) 4M x 36 |
|---------+--------------+-------------------+---------------|
| 36MB | (4) 44256 | (1) 4M x 36 | (1) 4M x 36 |
|------------------------------------------------------------|
| Note: Bank 0 and parity chips are factory installed and |
| are non configurable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG (7 | TAG (8 |
| | | | bit) | bit) |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | (1) 16K x |
| | | | | 4 |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | (1) 16K x |
| | | | | 4 |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 32K x | (1) 16K x |
| | | 8 | 8 | 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J5 | J6 | J23 | J24 |
|-------+-------------+------------+------------+------------|
| 64KB | pins 2 & 3 | pins 2 & 3 | N/A | pins 1 & 2 |
| | closed | closed | | closed |
|-------+-------------+------------+------------+------------|
| 128KB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 256KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (TAG) |
|------------------------------------------------------------|
| Type | J5 | J6 | J24 |
|-----------------+----------------+----------------+--------|
| Write through | N/A | pins 2 & 3 | N/A |
| | | closed | |
|-----------------+----------------+----------------+--------|
| Write back/7 | pins 2 & 3 | pins 1 & 2 | Open |
| bit | closed | closed | |
|-----------------+----------------+----------------+--------|
| Write back/8 | pins 1 & 2 | pins 2 & 3 | Closed |
| bit | closed | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | J9 | J10 | J11 |
|----------------+--------------+--------------+-------------|
| 80486SX (PQFP) | Open | Closed | Open |
|----------------+--------------+--------------+-------------|
| 80486SX (PGA) | Open | Open | Open |
|----------------+--------------+--------------+-------------|
| 80487SX | Open | Closed | Closed |
|----------------+--------------+--------------+-------------|
| 80486DX/DX2 | Closed | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J17 |
|----------------------------+-------------------------------|
| 25MHz | pins 3 - 7 closed |
|----------------------------+-------------------------------|
| 33MHz | pins 4 - 8 closed |
|----------------------------+-------------------------------|
| 50iMHz | pins 2 - 5 closed |
|----------------------------+-------------------------------|
| 66iMHz | pins 3 - 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|---------------+----------------------+---------------------|
| 512KB | (4) 256K x 4 | NONE |
|---------------+----------------------+---------------------|
| 1MB | (4) 256K x 4 | (4) 256K x 4 |
|------------------------------------------------------------|
| Note: Bank 0 is factory installed and is non configurable. |
+------------------------------------------------------------+