UNIDENTIFIED
486 MAINBOARD
|
Processor |
80486SX/80487SX/80486DX |
|
Processor Speed |
33MHz |
|
Chip Set |
OPTI |
|
Max. Onboard DRAM |
40MB |
|
Cache |
64/256KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 220mm |
|
I/O Options |
None |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
JP3 |
Turbo LED |
JP15 |
|
Reset switch |
JP13 |
Speaker |
JP16 |
|
Turbo switch |
JP14 |
Power LED & keylock |
JP17 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
» |
Power good signal detect from board |
JP1 |
pins 2 & 3 closed |
|
Power good signal detect from power supply |
JP1 |
pins 1 & 2 closed | |
|
» |
Monitor type select color |
JP2 |
Closed |
|
Monitor type select monochrome |
JP2 |
Open | |
|
» |
Factory configured - do not alter |
JP12 |
N/A |
|
» |
CMOS memory normal operation |
JP18 |
pins 1 & 2 closed |
|
CMOS memory clear |
JP18 |
pins 2 & 3 closed | |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
1MB |
(4) 256K x 9 |
NONE |
NONE |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
NONE |
NONE |
|
4MB |
(4) 1M x 9 |
NONE |
NONE |
NONE |
|
5MB |
(4) 256K x 9 |
(4) 1M x 9 |
NONE |
NONE |
|
6MB |
(4) 256K x 9 |
(4) 256K x 9 |
(1) 1M x 36 |
NONE |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
NONE |
NONE |
|
9MB |
(4) 256K x 9 |
(4) 1M x 9 |
(1) 1M x 36 |
NONE |
|
10MB |
(4) 256K x 9 |
(4) 256K x 9 |
(1) 1M x 36 |
(1) 1M x 36 |
|
12MB |
(4) 1M x 9 |
(4) 1M x 9 |
(1) 1M x 36 |
NONE |
|
13MB |
(4) 256K x 9 |
(4) 1M x 9 |
(1) 1M x 36 |
(1) 1M x 36 |
|
16MB |
(4) 1M x 9 |
(4) 1M x 9 |
(1) 1M x 36 |
(1) 1M x 36 |
|
16MB |
(4) 4M x 9 |
NONE |
NONE |
NONE |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
NONE |
NONE |
|
20MB |
(4) 4M x 9 |
(4) 1M x 9 |
NONE |
NONE |
|
24MB |
(4) 1M x 9 |
(4) 4M x 9 |
(1) 1M x 36 |
NONE |
|
24MB |
(4) 4M x 9 |
(4) 1M x 9 |
(1) 1M x 36 |
NONE |
|
28MB |
(4) 1M x 9 |
(4) 4M x 9 |
(1) 1M x 36 |
(1) 1M x 36 |
|
28MB |
(4) 4M x 9 |
(4) 1M x 9 |
(1) 1M x 36 |
(1) 1M x 36 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
NONE |
NONE |
|
36MB |
(4) 4M x 9 |
(4) 4M x 9 |
(1) 1M x 36 |
NONE |
|
40MB |
(4) 4M x 9 |
(4) 4M x 9 |
(1) 1M x 36 |
(1) 1M x 36 |
|
CACHE CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
TAG0 |
TAG1 |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 8K x 8 |
(1) 16K x 4 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
(1) 16K x 4 |
|
CACHE JUMPER CONFIGURATION | |||
|
Size |
JP4 |
JP5 |
JP6 |
|
64KB |
Open |
Open |
Open |
|
256KB |
Closed |
Closed |
Closed |
|
CPU TYPE CONFIGURATION | |||
|
Type |
JP8 |
JP9 |
JP10 |
|
80486SX |
Open |
pins 2 & 3 closed |
Open |
|
80487SX |
Closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
80486DX |
Closed |
pins 1 & 2 closed |
pins 2 & 3 closed |