(TXT) View Source
# DELL COMPUTER CORPORATION
DIMENSION 486SX/25, 486DX/33, 486DX2/50
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 25/33/50(internal)/50/66(internal)
Chip Set OPTI
Max. Onboard DRAM 64MB
SRAM Cache 64/256KB (optional module)
BIOS AMI
Dimensions 330mm x 218mm
I/O Options Floppy drive interface, IDE interface, bus
mouse port
parallel port, serial port (2), VGA port
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------------+----------+---------------+----------|
| PS/2 mouse | J1 | IDE interface | J23 |
| | | LED | |
|----------------------+----------+---------------+----------|
| IDE interface | J5 | Reset switch | J24 |
|----------------------+----------+---------------+----------|
| Floppy drive | J6 | Speaker | J25 |
| interface | | | |
|----------------------+----------+---------------+----------|
| Parallel port | J8 | Power LED & | J26 |
| | | keylock | |
|----------------------+----------+---------------+----------|
| Serial port (COM B) | J9 | VGA port | J27 |
|----------------------+----------+---------------+----------|
| Serial port (COM A) | J10 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | Monitor type select color | W1 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | W1 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | CMOS memory normal operation | W2 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | W2 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | I/O bus speed select SYSCLK/2 | W3 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | I/O bus speed select SYSCLK/1 | W3 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | On-board VGA enabled | W10 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | On-board VGA disabled | W10 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 3MB | (1) 256K x | (1) 256K x | (1) 256K x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 256K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 5MB | (1) 1M x 36 | (1) 256K x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 1M x 36 | (1) 256K x | (1) 256K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 9MB | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 17MB | (1) 4M x 36 | (1) 256K x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 4M x 36 | (1) 256K x | (1) 256K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 33MB | (1) 4M x 36 | (1) 4M x 36 | (1) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 34MB | (1) 4M x 36 | (1) 4M x 36 | (1) 256K x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU | Jumper W6 | Jumper W7 | Jumper W8 |
|----------+----------------+----------------+---------------|
| 80486DX2 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| 80486DX | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| 80487SX | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| 80486SX | pins 2 & 3 | pins 2 & 3 | open |
| | closed | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | Jumper W4 | Jumper W5 | Jumper W9 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO SWITCH CONFIGURATION (SW1) |
|------------------------------------------------------------|
| Mode |switch 1|switch 2|switch 3|switch 4|switch |
| | | | | | 5 |
|----------------+--------+--------+--------+--------+-------|
| 56Hz vertical | open | open | N/A | N/A | N/A |
| refresh | | | | | |
|----------------+--------+--------+--------+--------+-------|
| 60Hz vertical | open | closed | N/A | N/A | N/A |
| refresh | | | | | |
|----------------+--------+--------+--------+--------+-------|
| 72Hz vertical | closed | open | N/A | N/A | N/A |
| refresh | | | | | |
|----------------+--------+--------+--------+--------+-------|
| Enable | N/A | N/A | open | open | N/A |
| interlaced | | | | | |
|----------------+--------+--------+--------+--------+-------|
| 60Hz | N/A | N/A | open | closed | N/A |
| non-interlaced | | | | | |
|----------------+--------+--------+--------+--------+-------|
| 72Hz | N/A | N/A | closed | open | N/A |
| non-interlaced | | | | | |
|----------------+--------+--------+--------+--------+-------|
| 31.5KHz | N/A | N/A | N/A | N/A | open |
|horizontal scan | | | | | |
| rate | | | | | |
|----------------+--------+--------+--------+--------+-------|
|40KHz horizontal| N/A | N/A | N/A | N/A |closed |
| scan rate | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | VRAM | SW1/switch 6 |
|------------------+--------------------+--------------------|
| 512KB | (2) 256K x 4 | closed |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 4 | open |
+------------------------------------------------------------+