UNIDENTIFIED
486SI4
|
Processor |
80486SX/80487SX/80486DX/80486DX2 |
|
Processor Speed |
20/25/33/50/66(internal)MHz |
|
Chip Set |
C & T |
|
Max. Onboard DRAM |
32MB |
|
Cache |
64/128/256KB |
|
BIOS |
AMI/C & T |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
32-bit external video card slot |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Turbo LED |
J3 |
Reset switch |
J6 |
|
Turbo switch |
J4 |
Power LED & keylock |
J7 |
|
Speaker |
J5 |
32-bit external video card |
S1 |
|
Note:32-bit external video card slot may not be present on some board revisions. | |||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Local bus data size select 32 bits |
J8 |
pins 1 & 2 closed | |
|
Local bus data size select 16 bits |
J8 |
pins 2 & 3 closed | |
|
Factory configured - do not alter |
JP1 |
Open | |
|
Monitor type select color |
JP2 |
Closed | |
|
Monitor type select monochrome |
JP2 |
Open | |
|
Factory configured - do not alter |
JP3 |
pins 2 & 3 closed | |
|
Factory configured - do not alter |
JP4 |
pins 2 & 3 closed | |
|
Factory configured - do not alter |
JP5 |
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 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
20MB |
(4) 4M x 9 |
(4) 1M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
CACHE CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
TAG |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 8K x 8 |
|
128KB |
(4) 32K x 8 |
NONE |
(1) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 8K x 8 |
|
CACHE JUMPER CONFIGURATION | ||||
|
Sizer |
SR1 |
SR2 |
SR3 |
SR4 |
|
64KB |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
128KB |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
256KB |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
CACHE JUMPER CONFIGURATION (CONT) | |||||
|
Size |
SR5 |
SR6 |
SR7 |
SR8 |
SR9 |
|
64KB |
2 & 3 |
2 & 3 |
1 & 2 |
1 & 2 |
1 & 2 |
|
128KB |
1 & 2 |
2 & 3 |
2 & 3 |
1 & 2 |
1 & 2 |
|
256KB |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
Note: Pins designated should be in the closed position. | |||||
|
CPU TYPE CONFIGURATION | |||
|
Type |
JP6 |
JP7 |
JP8 |
|
80486SX |
Open |
Open |
pins 2 & 3 closed |
|
80487SX |
Closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
80486DX |
Closed |
pins 1 & 2 closed |
pins 1 & 2 closed |