SILICON VALLEY TECHNOLOGY
OPTI-486
Processor | 80486SX/80486DX |
Processor Speed | 33/40MHz |
Chip Set | OPTI |
Max. Onboard DRAM | 32MB |
Cache | 64/256KB |
BIOS | AMI/MR |
Dimensions | 330mm x 218mm |
I/O Options | None |
NPU Options | 4167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J11 | Turbo LED | JP11 |
Power LED & keylock | J20 | Reset switch | SW1 |
Speaker | J21 | Turbo switch | SW2 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | CMOS memory normal operation | JP1 | pins 2 & 3 closed |
CMOS memory clear | JP1 | pins 1 & 2 closed | |
» | Monitor type select color | JP2 | Closed |
Monitor type select monochrome | JP2 | Open | |
» | Bus clock speed select ATCLK/4 | JP6 | Closed |
Bus clock speed select ATCLK/6 | JP6 | Open | |
» | CPU speed select double frequency clock | JP7 | pins 2 & 3 closed |
CPU speed select singal phase clock | JP7 | pins 1 & 2 closed |
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
4MB | (4) 1M x 9 | NONE |
8MB | (4) 1M x 9 | (4) 1M x 9 |
12MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
20MB | (4) 1M x 9 | (4) 4M x 9 |
32MB | (4) 4M x 9 | (4) 4M x 9 |
CACHE CONFIGURATION | ||
Size | Cache | TAG |
64KB | (8) 8K x 8 | (1) 4K x 8 |
256KB | (8) 32K x 8 | (1) 16K x 8 |
CACHE JUMPER CONFIGURATION | ||||
Size | JP8 | JP9 | JP10 | JP12 |
64KB | Open | Open | Open | Open |
256KB | Open | Closed | Closed | Closed |
CPU TYPE CONFIGURATION | |||
Size | JP3 | JP4 | JP5 |
80486SX | Open | Open | pins 2 & 3 closed |
80486DX | pins 2 & 3 closed | Closed | pins 1 & 2 closed |