DELL COMPUTER CORPORATION
Precision 486SX/25, 486DX/33, 486DX2/50
|
Processor |
80486SX/80487SX/80486DX/80486DX2 |
|
Processor Speed |
25/33/50MHz |
|
Chip Set |
OPTI |
|
Max. Onboard DRAM |
64MB |
|
Cache |
64/256KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
Bus mouse port, floppy interface, IDE interface, parallel port, proprietary expansion module, serial ports (2), VGA port |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Internal battery holder |
BAT |
Serial port 1 |
J10 |
|
Proprietary expansion module |
EXP |
IDE interface LED |
J23 |
|
Bus mouse |
J1 |
Reset switch |
J24 |
|
IDE interface |
J5 |
Speaker |
J25 |
|
Floppy drive interface |
J6 |
Power LED & keylock |
J26 |
|
Parallel port |
J8 |
VGA port |
J27 |
|
Serial port 2 |
J9 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Monitor type select color or monochrome VGA |
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 | |
|
CPU clock source select SYSCLK/1 |
W3 |
pins 1 & 2 closed | |
|
CPU clock source select SYSCLK/2 |
W3 |
pins 2 & 3 closed | |
|
VGA port enabled |
W10 |
pins 1 & 2 closed | |
|
VGA port disabled |
W10 |
pins 2 & 3 closed | |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
1MB |
(1) 256K x 36 |
NONE |
NONE |
NONE |
|
2MB |
(1) 256K x 36 |
(1) 256K x 36 |
NONE |
NONE |
|
3MB |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
NONE |
|
4MB |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
4MB |
(1) 1M x 36 |
NONE |
NONE |
NONE |
|
5MB |
(1) 1M x 36 |
(1) 256K x 36 |
NONE |
NONE |
|
6MB |
(1) 1M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
NONE |
|
8MB |
(1) 1M x 36 |
(1) 1M x 36 |
NONE |
NONE |
|
9MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
NONE |
|
10MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
12MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
NONE |
|
16MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
16MB |
(1) 4M x 36 |
NONE |
NONE |
NONE |
|
17MB |
(1) 4M x 36 |
(1) 256K x 36 |
NONE |
NONE |
|
18MB |
(1) 4M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
NONE |
|
20MB |
(1) 4M x 36 |
(1) 1M x 36 |
NONE |
NONE |
|
24MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
NONE |
|
32MB |
(1) 4M x 36 |
(1) 4M x 36 |
NONE |
NONE |
|
33MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 256K x 36 |
NONE |
|
34MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
36MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 1M x 36 |
NONE |
|
40MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
48MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
NONE |
|
64MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
|
CACHE CONFIGURATION | |
|
Size |
Bank 0 |
|
64KB |
(8) 8K x 8 |
|
256KB |
(8) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | |||
|
Size |
W4 |
W5 |
W9 |
|
64KB |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
256KB |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
CPU TYPE CONFIGURATION | |||
|
Type |
W6 |
W7 |
W8 |
|
80486SX |
pins 2 & 3 closed |
pins 2 & 3 closed |
Open |
|
80487SX |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
80486DX |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
VGA REFRESH CONFIGURATION (800 X 600 RESOLUTION) | |||
|
Refresh Rate |
SW1/1 |
SW1/2 | |
|
56Hz |
Off |
Off | |
|
56Hz |
On |
On | |
|
60Hz |
Off |
On | |
|
72Hz |
On |
Off | |
|
VGA REFRESH CONFIGURATION (1024 X 768 RESOLUTION) | |||
|
Refresh Rate |
SW1/3 |
SW1/4 | |
|
Interlaced |
Off |
Off | |
|
60Hz |
Off |
On | |
|
70Hz |
On |
Off | |
|
72Hz |
On |
On | |
|
VGA REFRESH CONFIGURATION | |||
|
Refresh Rate |
SW1/5 | ||
|
31.5Hz horizontal, 60/70Hz vertical |
Off | ||
|
40Hz horizontal, 75/80Hz vertical (see note) |
On | ||
|
Note :Use 75Hz for video modes 0 through 10h and 13h. Use 80Hz for video modes 11h and 12h. | |||
|
VRAM CONFIGURATION | ||
|
Size |
Bank 0 | |
|
512KB |
NONE | |
|
1MB |
(4) 44256 ZIPPs | |
|
VRAM SWITCH CONFIGURATION | ||
|
Size |
SW1/6 | |
|
512KB |
On | |
|
1MB |
Off | |