DELL COMPUTER CORPORATION
Precision 486SX/25, Precision 486DX/33
|
Processor |
80486SX/80487SX/80486DX |
|
Processor Speed |
25/33MHz |
|
Chip Set |
OPTI |
|
Max. Onboard DRAM |
32MB |
|
Cache |
64/256KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
None |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Reset switch |
J9 |
Speaker |
J21 |
|
External battery |
J18 |
Power LED & keylock |
J22 |
|
Turbo switch |
J20 | ||
|
Note:Although there is a 4167 socket on the board, it is not supported. (As per the manufacturer) | |||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Battery select internal |
W1 |
Closed | |
|
Battery select external |
W1 |
Open | |
|
CMOS memory normal operation |
W2 |
pins 1 & 2 closed | |
|
CMOS memory clear |
W2 |
pins 2 & 3 closed | |
|
CPU speed select ATCLK/4 |
W3 |
pins 2 & 3 closed | |
|
CPU speed select ATCLK/6 |
W3 |
pins 1 & 2 closed | |
|
Factory configured - do not alter |
W8 |
Open | |
|
Factory configured - do not alter |
W9 |
Open | |
|
Factory configured - do not alter |
W10 |
Open | |
|
Monitor type select color |
W12 |
pins 1 & 2 closed | |
|
Monitor type select monochrome |
W12 |
pins 2 & 3 closed | |
|
Factory test disabled |
W13 |
Open | |
|
Factory test enabled |
W13 |
pins 1 & 2 closed | |
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
1MB |
(4) 256K x 9 |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
|
4MB |
(4) 1M x 9 |
NONE |
|
5MB |
(4) 1M x 9 |
(4) 256K x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
20MB |
(4) 4M x 9 |
(4) 256K x 9 |
|
32MB |
(4) 4M x 9 |
(4) 1M x 9 |
|
CACHE CONFIGURATION | |
|
Size |
Bank 0 |
|
64KB |
(8) 8K x 8 |
|
256KB |
(8) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | |||
|
Size |
W8 |
W9 |
W18 |
|
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 |
W5 |
W6 |
W7 |
|
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 |