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# DELL COMPUTER CORPORATION
MIDSIZE 486 ISA/VL SYSTEMS
Processor 80486SX/80486SX2/80486DX2/80486DX4
Processor 25/33/50(internal)/66(internal)/100(internal)MHz
Speed
Chip Set VLSI
Video Chip None
Set
Maximum 64MB
Onboard
Memory
Maximum Video None
Memory
Cache 128KB
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slot, floppy drive
interface, IDE interface, parallel port, PS/2
mouse port, serial ports (2), feature connector,
VGA port, riser slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| External battery | BATT | IDE interface | CN7 |
|-------------------+----------+------------------+----------|
| PS/2 mouse port | CN1 | Floppy drive | CN8 |
| | | interface | |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN2 | IDE interface | CN9 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN3 | Front panel | PANEL |
| | | connector | |
|-------------------+----------+------------------+----------|
| Parallel port | CN4 | Riser slot | SL1 |
|-------------------+----------+------------------+----------|
| VGA port | CN5 | 32-bit VESA | SL2 |
| | | local bus slot | |
|-------------------+----------+------------------+----------|
| Feature connector | CN6 | Speaker | SPKR |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | CDR | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Password enabled | EPWD | Closed |
|---+----------------------------------+--------+------------|
| | Password disabled | EPWD | Open |
|---+----------------------------------+--------+------------|
| » | On board video enabled | EVGA | Closed |
|---+----------------------------------+--------+------------|
| | On board video disabled | EVGA | Open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | IDEIRQ | Pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | IDERDY | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | On board speaker enabled | SPKR | Pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | On board speaker disabled | SPKR | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 4MB | (1) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 2M x 36 | None |
|------------------+--------------------+--------------------|
| 12MB | (1) 1M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 4M x 36 | None |
|------------------+--------------------+--------------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (1) 4M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 8M x 36 | None |
|------------------+--------------------+--------------------|
| 36MB | (1) 1M x 36 | (1) 8M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (1) 8M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (1) 4M x 36 | (1) 8M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 |
|------------------------------------------------------------|
| Note: Board also accepts x 32 SIMMs. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG | U55/U57 |
|-----------+---------------+----------------+---------------|
| 128KB | (4) 32K x 8 | Unidentified | Unidentified |
|------------------------------------------------------------|
| Note: The size of TAG chip and U55/U57 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | SPEED |
|-------------------------------+----------------------------|
| 25MHz | Closed |
|-------------------------------+----------------------------|
| 33MHz | Open |
|-------------------------------+----------------------------|
| 50iMHz | Closed |
|-------------------------------+----------------------------|
| 66iMHz | Open |
|-------------------------------+----------------------------|
| 100iMHz | Open |
+------------------------------------------------------------+