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 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
PS/2 mouse |
J1 |
IDE interface LED |
J23 |
|
IDE interface |
J5 |
Reset switch |
J24 |
|
Floppy drive interface |
J6 |
Speaker |
J25 |
|
Parallel port |
J8 |
Power LED & keylock |
J26 |
|
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 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 |
|
CPU TYPE CONFIGURATION | |||
|
CPU |
Jumper W6 |
Jumper W7 |
Jumper W8 |
|
80486DX2 |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
80486DX |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
80487SX |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
80486SX |
pins 2 & 3 closed |
pins 2 & 3 closed |
open |
|
SRAM JUMPER CONFIGURATION | |||
|
Size |
Jumper W4 |
Jumper W5 |
Jumper 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 |
|
VIDEO SWITCH CONFIGURATION (SW1) | |||||
|
Mode |
switch 1 |
switch 2 |
switch 3 |
switch 4 |
switch 5 |
|
56Hz vertical refresh |
open |
open |
N/A |
N/A |
N/A |
|
60Hz vertical refresh |
open |
closed |
N/A |
N/A |
N/A |
|
72Hz vertical refresh |
closed |
open |
N/A |
N/A |
N/A |
|
Enable interlaced |
N/A |
N/A |
open |
open |
N/A |
|
60Hz non-interlaced |
N/A |
N/A |
open |
closed |
N/A |
|
72Hz non-interlaced |
N/A |
N/A |
closed |
open |
N/A |
|
31.5KHz horizontal scan rate |
N/A |
N/A |
N/A |
N/A |
open |
|
40KHz horizontal scan rate |
N/A |
N/A |
N/A |
N/A |
closed |
|
VRAM CONFIGURATION | ||
|
Size |
VRAM |
SW1/switch 6 |
|
512KB |
(2) 256K x 4 |
closed |
|
1MB |
(4) 256K x 4 |
open |