DELL COMPUTER CORPORATION
System 486D
|
Processor |
80486SX/80487SX/80486DX |
|
Processor Speed |
16/20/25/33 |
|
Chip Set |
VLSI |
|
Max. Onboard DRAM |
64MB |
|
Cache |
None |
|
BIOS |
AMI |
|
Dimensions |
329mm x 334mm |
|
I/O Options |
Bus mouse, floppy interface, IDE interface, parallel port, serial ports (2), VGA port |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
VGA port |
CN1 |
External battery |
JBAT |
|
Parallel port |
CN2 |
Cooling fan |
JFAN |
|
Serial port 2 |
CN3 |
VGA pass-through |
JFEAT |
|
Serial port 1 |
CN4 |
Primary floppy drive interface |
JFLOP |
|
Bus mouse port |
CN5 |
IDE interface |
JIDE |
|
Board ground points |
GND |
Front panel status LCD |
JVIEW |
|
IDE interface LED |
JLED | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
| » |
Boot EEPROM select normal operation |
CLRB |
Open |
|
Boot EEPROM clear |
CLRB |
Closed | |
| » |
VGA interrupt request select none |
JP5 pins 1 & 2 |
Open |
|
VGA interrupt request select IRQ9 |
JP5 pins 1 & 2 |
Closed | |
| » |
Factory configured - do not alter |
JP5 pins 3 & 4 |
Open |
| » |
Monitor type select color |
JP5 pins 5 & 6 |
Closed |
|
Monitor type select monochrome |
JP5 pins 5 & 6 |
Closed | |
| » |
Factory configured - do not alter |
JP5 pins 7 & 8 |
Open |
| » |
Password check disabled |
JP5 pins 9 & 10 |
Open |
|
Password check enabled |
JP5 pins 9 & 10 |
Closed | |
| » |
Monitor type select standard VGA |
JP5 pins 11 & 12 |
Open |
|
Monitor type select Multifrequency (MultiSync) VGA |
JP5 pins 11 & 12 |
Closed | |
| » |
IOCHRDY wait state(s) disabled |
JP5 pins 17 & 18 |
Closed |
|
IOCHRDY wait state(s) enabled |
JP5 pins 17 & 18 |
Open | |
| » |
Boot source select normal (floppy or hard drive) |
JP5 pins 19 & 20 |
Open |
|
Boot source select Boot EEPROM on AT bus |
JP5 pins 19 & 20 |
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 |
|
7MB |
(1) 1M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
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 |
|
13MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
|
16MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
DRAM CONFIGURATION (CON’T) | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
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 |
|
19MB |
(1) 4M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
20MB |
(1) 4M x 36 |
(1) 1M x 36 |
NONE |
NONE |
|
21MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
NONE |
|
22MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
24MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
NONE |
|
25MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
|
28MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
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 |
|
37MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
|
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 |
|
49MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 256K x 36 |
|
52MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 1M x 36 |
|
64MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
|
CPU SPEED CONFIGURATION | ||||
|
Speed |
JP1 |
JP2 |
JP3 |
JP4 |
|
16MHz |
Open |
Open |
Open |
Closed |
|
20MHz |
Open |
Open |
Closed |
Open |
|
25MHz |
Open |
Closed |
Open |
Open |
|
33MHz |
Closed |
Open |
Open |
Open |
|
IOCHRDY CONFIGURATION | |
|
Setting |
JP5 pins 13 & 14 |
|
Signal disabled to IDE drive(s) |
Closed |
|
Signal enabled to IDE drive(s) |
Open |