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# DELL COMPUTER CORPORATION
SYSTEM 4XXSE
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50MHz
Chip Set Intel
Max. Onboard 128MB
DRAM
Cache None (128KB on 433SE and 450SE)
BIOS Phoenix
Dimensions 328mm x 305mm
I/O Options 32-bit external CPU/NPU card slot, floppy
drive interface, IDE interface, parallel
port, serial ports (2), system status LCD,
VGA port
NPU Options None (4167 on 433SE)
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Auxiliary power | APWR | IDE interface | JIDE |
|-------------------+----------+------------------+----------|
| Serial port 1 | JCOM1 | Power LED & | JLED |
| | | keylock | |
|-------------------+----------+------------------+----------|
| Serial port 2 | JCOM2 | Parallel port | JPAR |
|-------------------+----------+------------------+----------|
| CPU/NPU card | CPU | Video feature | JVID |
| | | card slot | |
|-------------------+----------+------------------+----------|
| Board ground | GND | Front panel | JVIEW |
| points | | status LCD | |
|-------------------+----------+------------------+----------|
| External battery | JBAT | Main power | MPWR |
|-------------------+----------+------------------+----------|
| Cooling fan power | JFAN | Reset switch | RST |
|-------------------+----------+------------------+----------|
| Floppy drive | JFLOP | Speaker | SPK |
| interface | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|---------------------------------+---------------+----------|
| » | Boot EEPROM write/clear | BOOT | Closed |
| | enabled | | |
|---+-----------------------------+---------------+----------|
| | Boot EEPROM write/clear | BOOT | Open |
| | disabled | | |
|---+-----------------------------+---------------+----------|
| » | Factory configured - do not | MNT | Open |
| | alter | | |
|---+-----------------------------+---------------+----------|
| » | VGA interface enabled | SW1/1 | Off |
|---+-----------------------------+---------------+----------|
| | VGA interface disabled | SW1/1 | On |
|---+-----------------------------+---------------+----------|
| » | Monitor type select fixed | SW1/2 | Off |
| | frequency | | |
|---+-----------------------------+---------------+----------|
| | Monitor type select multi | SW1/2 | On |
| | frequency | | |
|---+-----------------------------+---------------+----------|
| » | Password check enabled | SW1/3 | On |
|---+-----------------------------+---------------+----------|
| | Password check disabled | SW1/3 | Off |
|---+-----------------------------+---------------+----------|
| » | BIOS chip select flash | SW1/4 | Off |
| | EEPROM | | |
|---+-----------------------------+---------------+----------|
| | BIOS chip select auxiliary | SW1/4 | On |
| | ROM | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+--------------+------------+------------+------------|
| 2MB | (2) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|------+--------------+------------+------------+------------|
| 4MB | (2) 256K x | (2) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+--------------+------------+------------+------------|
| 4MB | (2) 512K x | NONE | NONE | NONE |
| | 36 | | | |
|------+--------------+------------+------------+------------|
| 6MB | (2) 256K x | (2) 256K x | (2) 256K x | NONE |
| | 36 | 36 | 36 | |
|------+--------------+------------+------------+------------|
| 6MB | (2) 512K x | (2) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+--------------+------------+------------+------------|
| 8MB | (2) 256K x | (2) 256K x | (2) 256K x | (2) 256K x |
| | 36 | 36 | 36 | 36 |
|------+--------------+------------+------------+------------|
| 8MB | (2) 512K x | (2) 256K x | (2) 256K x | NONE |
| | 36 | 36 | 36 | |
|------+--------------+------------+------------+------------|
| 8MB | (2) 512K x | (2) 512K x | NONE | NONE |
| | 36 | 36 | | |
|------+--------------+------------+------------+------------|
| 8MB | (2) 1M x 36 | NONE | NONE | NONE |
|------+--------------+------------+------------+------------|
| 10MB | (2) 512K x | (2) 256K x | (2) 256K x | (2) 256K x |
| | 36 | 36 | 36 | 36 |
|------+--------------+------------+------------+------------|
| 10MB | (2) 512K x | (2) 512K x | (2) 256K x | NONE |
| | 36 | 36 | 36 | |
|------+--------------+------------+------------+------------|
| 10MB | (2) 1M x 36 | (2) 256K x | NONE | NONE |
| | | 36 | | |
|------+--------------+------------+------------+------------|
| 12MB | (2) 512K x | (2) 512K x | (2) 256K x | (2) 256K x |
| | 36 | 36 | 36 | 36 |
|------+--------------+------------+------------+------------|
| 12MB | (2) 512K x | (2) 512K x | (2) 512K x | NONE |
| | 36 | 36 | 36 | |
|------+--------------+------------+------------+------------|
| 12MB | (2) 1M x 36 | (2) 256K x | (2) 256K x | NONE |
| | | 36 | 36 | |
|------+--------------+------------+------------+------------|
| 12MB | (2) 1M x 36 | (2) 512K x | NONE | NONE |
| | | 36 | | |
|------+--------------+------------+------------+------------|
| 14MB | (2) 512K x | (2) 512K x | (2) 512K x | (2) 256K x |
| | 36 | 36 | 36 | 36 |
|------+--------------+------------+------------+------------|
| 14MB | (2) 1M x 36 | (2) 256K x | (2) 256K x | (2) 256K x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 14MB | (2) 1M x 36 | (2) 512K x | (2) 256K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (2) 512K x | (2) 512K x | (2) 512K x | (2) 512K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (2) 1M x 36 | (2) 512K x | (2) 256K x | (2) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (2) 1M x 36 | (2) 512K x | (2) 512K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | (2) 2M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 18MB | (2) 1M x 36 | (2) 512K x | (2) 512K x | (2) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 18MB | (2) 1M x 36 | (2) 1M x 36 | (2) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 18MB | (2) 2M x 36 | (2) 256K x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 20MB | (2) 1M x 36 | (2) 512K x | (2) 512K x | (2) 512K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 20MB | (2) 1M x 36 | (2) 1M x 36 | (2) 256K x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 20MB | (2) 1M x 36 | (2) 1M x 36 | (2) 512K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 20MB | (2) 2M x 36 | (2) 256K x | (2) 256K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 20MB | (2) 2M x 36 | (2) 512K x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 22MB | (2) 1M x 36 | (2) 1M x 36 | (2) 512K x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 22MB | (2) 2M x 36 | (2) 256K x | (2) 256K x | (2) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 22MB | (2) 2M x 36 | (2) 512K x | (2) 256K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 24MB | (2) 1M x 36 | (2) 1M x 36 | (2) 512K x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 24MB | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 24MB | (2) 2M x 36 | (2) 512K x | (2) 256K x | (2) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 24MB | (2) 2M x 36 | (2) 512K x | (2) 512K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 26MB | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 26MB | (2) 2M x 36 | (2) 512K x | (2) 512K x | (2) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 26MB | (2) 2M x 36 | (2) 1M x 36 | (2) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 28MB | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 28MB | (2) 2M x 36 | (2) 1M x 36 | (2) 256K x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 28MB | (2) 2M x 36 | (2) 1M x 36 | (2) 512K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 30MB | (2) 2M x 36 | (2) 1M x 36 | (2) 512K x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x | (2) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 2M x 36 | (2) 1M x 36 | (2) 512K x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 2M x 36 | (2) 1M x 36 | (2) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 34MB | (2) 2M x 36 | (2) 1M x 36 | (2) 1M x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 34MB | (2) 2M x 36 | (2) 2M x 36 | (2) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 34MB | (2) 4M x 36 | (2) 256K x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 36MB | (2) 2M x 36 | (2) 1M x 36 | (2) 1M x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 36MB | (2) 2M x 36 | (2) 2M x 36 | (2) 256K x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 36MB | (2) 2M x 36 | (2) 2M x 36 | (2) 512K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 36MB | (2) 4M x 36 | (2) 256K x | (2) 256K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 36MB | (2) 4M x 36 | (2) 512K x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 38MB | (2) 2M x 36 | (2) 2M x 36 | (2) 512K x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 38MB | (2) 4M x 36 | (2) 256K x | (2) 256K x | (2) 256K x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 38MB | (2) 4M x 36 | (2) 512K x | (2) 256K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 40MB | (2) 2M x 36 | (2) 2M x 36 | (2) 512K x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 40MB | (2) 2M x 36 | (2) 2M x 36 | (2) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 40MB | (2) 4M x 36 | (2) 512K x | (2) 256K x | (2) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 40MB | (2) 4M x 36 | (2) 512K x | (2) 512K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 42MB | (2) 2M x 36 | (2) 2M x 36 | (2) 1M x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 42MB | (2) 4M x 36 | (2) 512K x | (2) 512K x | (2) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 42MB | (2) 4M x 36 | (2) 1M x 36 | (2) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 44MB | (2) 2M x 36 | (2) 2M x 36 | (2) 1M x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 44MB | (2) 4M x 36 | (2) 512K x | (2) 512K x | (2) 512K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 44MB | (2) 4M x 36 | (2) 1M x 36 | (2) 512K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 46MB | (2) 4M x 36 | (2) 1M x 36 | (2) 512K x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (2) 2M x 36 | (2) 2M x 36 | (2) 1M x | (2) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 48MB | (2) 4M x 36 | (2) 1M x 36 | (2) 512K x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (2) 4M x 36 | (2) 1M x 36 | (2) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 48MB | (2) 4M x 36 | (2) 2M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 50MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 50MB | (2) 4M x 36 | (2) 1M x 36 | (2) 1M x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 50MB | (2) 4M x 36 | (2) 2M x 36 | (2) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 52MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 52MB | (2) 4M x 36 | (2) 1M x 36 | (2) 1M x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 52MB | (2) 4M x 36 | (2) 2M x 36 | (2) 256K x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 52MB | (2) 4M x 36 | (2) 2M x 36 | (2) 512K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 54MB | (2) 4M x 36 | (2) 2M x 36 | (2) 512K x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 56MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x | (2) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 56MB | (2) 4M x 36 | (2) 1M x 36 | (2) 1M x | (2) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 56MB | (2) 4M x 36 | (2) 2M x 36 | (2) 512K x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 56MB | (2) 4M x 36 | (2) 2M x 36 | (2) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 58MB | (2) 4M x 36 | (2) 2M x 36 | (2) 1M x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 60MB | (2) 4M x 36 | (2) 2M x 36 | (2) 1M x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x | (2) 2M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (2) 4M x 36 | (2) 2M x 36 | (2) 1M x | (2) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (2) 4M x 36 | (2) 2M x 36 | (2) 2M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 66MB | (2) 4M x 36 | (2) 2M x 36 | (2) 2M x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 66MB | (2) 4M x 36 | (2) 4M x 36 | (2) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 68MB | (2) 4M x 36 | (2) 2M x 36 | (2) 2M x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 68MB | (2) 4M x 36 | (2) 4M x 36 | (2) 256K x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 68MB | (2) 4M x 36 | (2) 4M x 36 | (2) 512K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 70MB | (2) 4M x 36 | (2) 4M x 36 | (2) 512K x | (2) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 72MB | (2) 4M x 36 | (2) 4M x 36 | (2) 512K x | (2) 512K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 72MB | (2) 4M x 36 | (2) 4M x 36 | (2) 1M x | NONE |
| | | | 36 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 74MB | (2) 4M x 36 | (2) 4M x | (2) 1M x | (2) 256K x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 76MB | (2) 4M x 36 | (2) 4M x | (2) 1M x | (2) 512K x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 80MB | (2) 4M x 36 | (2) 4M x | (2) 1M x | (2) 1M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 80MB | (2) 4M x 36 | (2) 4M x | (2) 2M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 82MB | (2) 4M x 36 | (2) 4M x | (2) 2M x | (2) 256K x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 84MB | (2) 4M x 36 | (2) 4M x | (2) 2M x | (2) 512K x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 88MB | (2) 4M x 36 | (2) 4M x | (2) 2M x | (2) 1M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 96MB | (2) 4M x 36 | (2) 4M x | (2) 2M x | (2) 2M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 96MB | (2) 4M x 36 | (2) 4M x | (2) 4M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 98MB | (2) 4M x 36 | (2) 4M x | (2) 4M x | (2) 256K x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 100MB | (2) 4M x 36 | (2) 4M x | (2) 4M x | (2) 512K x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 104MB | (2) 4M x 36 | (2) 4M x | (2) 4M x | (2) 1M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 112MB | (2) 4M x 36 | (2) 4M x | (2) 4M x | (2) 2M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 128MB | (2) 4M x 36 | (2) 4M x | (2) 4M x | (2) 4M x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+