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 (CON’T) | |||||
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 |