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# INTEL CORPORATION
CLASSIC R
Processor 80486SX/80486DX/80486DX2
Processor 25/33/50(internal)/66(internal)MHz
Speed
Chip Set VLSI
Max. Onboard 32MB
DRAM
Cache 64/128/256KB
BIOS Phoenix
Dimensions 330mm x 218mm
I/O Options Floppy drive interface, IDE interface, parallel
port, PS/2 mouse port, serial ports (2), VESA
feature connector, VGA port, riser slot
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------------+----------+---------------+----------|
| VGA port | J1 | Chassis fan | J26 |
| | | power | |
|----------------------+----------+---------------+----------|
| Parallel port | J2 | IDE interface | J29 |
| | | LED | |
|----------------------+----------+---------------+----------|
| Serial port 2 | J3 | Power LED & | J30 |
| | | keylock | |
|----------------------+----------+---------------+----------|
| Serial port 1 | J4 | Reset switch | J31 |
|----------------------+----------+---------------+----------|
| PS/2 mouse port | J5 | Chassis fan | J32 |
| | | power | |
|----------------------+----------+---------------+----------|
| VESA feature | J10 | Speaker | J33 |
| connector | | | |
|----------------------+----------+---------------+----------|
| IDE interface | J14 | Riser slot | SL1 |
|----------------------+----------+---------------+----------|
| Floppy drive | J15 | | |
| interface | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | 12v to flash BIOS enabled | J12 | pins 1 & 2 |
| | | | closed |
|----+---------------------------------+--------+------------|
| | 12v to flash BIOS disabled | J12 | pins 2 & 3 |
| | | | closed |
|----+---------------------------------+--------+------------|
| » | Flash BIOS recovery mode | J13 | pins 1 & 2 |
| | disabled | | closed |
|----+---------------------------------+--------+------------|
| | Flash BIOS recovery mode | J13 | pins 2 & 3 |
| | enabled | | closed |
|----+---------------------------------+--------+------------|
| » | On board video enabled | J16 | pins 1 & 2 |
| | | | closed |
|----+---------------------------------+--------+------------|
| | On board video disabled | J16 | pins 2 & 3 |
| | | | closed |
|----+---------------------------------+--------+------------|
| » | Floppy drive write protect | J17 | pins 2 & 3 |
| | enabled | | closed |
|----+---------------------------------+--------+------------|
| | Floppy drive write protect | J17 | pins 1 & 2 |
| | disabled | | closed |
|----+---------------------------------+--------+------------|
| » | Password enabled | J20 | pins 2 & 3 |
| | | | closed |
|----+---------------------------------+--------+------------|
| | Password clear | J20 | pins 1 & 2 |
| | | | closed |
|----+---------------------------------+--------+------------|
| » | CMOS access enabled | J21 | pins 1 & 2 |
| | | | closed |
|----+---------------------------------+--------+------------|
| | CMOS access disabled | J21 | pins 2 & 3 |
| | | | closed |
|----+---------------------------------+--------+------------|
| » | CMOS memory normal operation | J28 | Closed |
|----+---------------------------------+--------+------------|
| | CMOS memory clear | J28 | Open |
|------------------------------------------------------------|
| Note: The location of the above jumpers are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (1) 512K x 36 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (1) 512K x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 4MB | (1) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 6MB | (1) 512K x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 6MB | (1) 1M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 2M x 36 | NONE |
|------------------+--------------------+--------------------|
| 10MB | (1) 512K x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 10MB | (1) 2M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (1) 1M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 12MB | (1) 2M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 18MB | (1) 512K x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 18MB | (1) 4M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (1) 2M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (1) 4M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-----------+----------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|-----------+----------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|-----------+----------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|------------------------------------------------------------|
| Note: The orientation of Banks 0 & 1 and TAG is |
| unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J11 pins 1 | J11 pins 3 | J11 pins 5 | J11 pins 7 |
| | & 2 | & 4 | & 6 | & 8 |
|-------+-------------+------------+------------+------------|
| 64KB | Open | Open | Open | Open |
|-------+-------------+------------+------------+------------|
| 128KB | Closed | Open | Closed | Open |
|-------+-------------+------------+------------+------------|
| 256KB | Closed | Closed | Open | Closed |
|------------------------------------------------------------|
| Note: The location of J11 is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | J22 | J23 | j24 | j25 |
|-----------+------------+-----------+-----------+-----------|
| 80486SX | pins 2 & 3 | pins 1 & | pins 1 & | pins 1 & |
| (PQFP) | closed | 2 closed | 2 closed | 2 closed |
|-----------+------------+-----------+-----------+-----------|
| 80486SX | pins 1 & 2 | pins 2 & | pins 2 & | pins 2 & |
| (PGA) | closed | 3 closed | 3 closed | 3 closed |
|-----------+------------+-----------+-----------+-----------|
| 80486DX | pins 2 & 3 | pins 1 & | pins 1 & | pins 1 & |
| | closed | 2 closed | 2 closed | 2 closed |
|-----------+------------+-----------+-----------+-----------|
| 80486DX2 | pins 2 & 3 | pins 1 & | pins 1 & | pins 1 & |
| | closed | 2 closed | 2 closed | 2 closed |
|------------------------------------------------------------|
| Note: The locations of J22, J23, J24 & J25 are |
| unidentified. The location of the PQFP socket is |
| unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J18 | J19 |
|------------------+--------------------+--------------------|
| 25MHz | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 33MHz | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 50iMHz | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 66iMHz | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------------------------------------------------|
| Note: The locations of J18 & J19 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|-----------------+------------------+-----------------------|
| 512KB | 512KB | NONE |
|-----------------+------------------+-----------------------|
| 1MB | 512KB | (4) 256K x 4 |
|------------------------------------------------------------|
| Note: Bank 0 is factory installed and is not configurable. |
| The location is unidentified. |
+------------------------------------------------------------+