UNIDENTIFIED
80486 CACHE SYSTEM
Processor | 80486SX/80487SX/80486DX |
Processor Speed | 25/33/40/50MHz |
Chip Set | OPTI |
Max. Onboard DRAM | 32MB |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | 32-bit system card |
NPU Options | 4167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Speaker | J1 | Turbo switch | J5 |
Power LED & keylock | J2 | External battery | J6 |
Reset switch | J3 | 32-bit system card | SL1 |
Turbo LED | J4 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | NPU wait state select 0 wait states | JP1 | Open |
NPU wait state select 1 wait state | JP1 | Closed | |
» | Monitor type select color | JP2 | Open |
Monitor type select monochrome | JP2 | Closed | |
» | Factory configured - do not alter | JP17 | Open |
» | Factory configured - do not alter | JPA | Open |
» | Factory configured - do not alter | JPB | 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 |
17MB | (4) 4M x 9 | (4) 256K x 9 |
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 |
64KB | (4) 8K x 8 | (4) 8K x 8 |
128KB | (4) 32K x 8 | NONE |
256KB | (4) 32K x 8 | (4) 32K x 8 |
CACHE CONFIGURATION (TAG) | ||||
Size | U15 | U16 | U17 | U18 |
64KB | NONE | NONE | (1) 16K x 4 | (1) 8K x 8 |
128KB | NONE | NONE | (1) 16K x 4 | (1) 8K x 8 |
256KB | (1) 16K x 4 | (1) 16K x 4 | (1) 16K x 4 | NONE |
CACHE JUMPER CONFIGURATION | ||||
Size | JP6 | JP7 | JP8 | JP9 |
64KB | Open | Open | Open | Open |
128KB | Closed | Open | Closed | pins 2 & 3 closed |
256KB | Closed | Closed | Closed | pins 1 & 2 closed |
CPU TYPE CONFIGURATION | |||
Type | JP3 | JP4 | JP5 |
80486SX | Open | pins 1 & 2 closed | Open |
80487SX | Closed | pins 2 & 3 closed | pins 1 & 2 closed |
80486DX | Closed | pins 2 & 3 closed | pins 2 & 3 closed |
CLOCK SELECT CONFIGURATION | |||
Clock | JP10 | JP11 | JP12 |
CLK/3 | pins 1 & 2 closed | Closed | Open |
CLK/4 | pins 1 & 2 closed | Open | Closed |
ECLK/5 | pins 1 & 2 closed | Open | Open |
CLK/6 | pins 1 & 2 closed | Closed | Closed |