UNIDENTIFIED
OPTI486DX-33/50WB, 486SX-20/25WB
Processor | 80486SX/80486DX |
Processor Speed | 20/25/33/50(internal)MHz |
Chip Set | OPTI |
Max. Onboard DRAM | 40MB (8MB on external memory card) |
Cache | 64/256KB |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | 32-bit external memory card |
NPU Options | 4167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J10 | 32-bit external memory card | SL1 |
Turbo LED | J12 | Reset switch | SW1 |
Power LED & keylock | J23 | Turbo switch | SW2 |
Speaker | J24 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Monitor type select monochrome | JP1 | Open |
Monitor type select color | JP1 | Closed | |
» | CMOS memory normal operation | JP2 | pins 2 & 3 closed |
CMOS memory clear | JP2 | pins 1 & 2 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 |
3MB | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 | NONE |
4MB | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 |
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 | (4) 1M x 9 | NONE |
7MB | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 | (4) 1M x 9 |
8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE | NONE | NONE |
32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
36MB | (4) 4M x 9 | (4) 4M x 9 | (4) 1M x 9 | NONE |
40MB | (4) 4M x 9 | (4) 4M x 9 | (4) 1M x 9 | (4) 1M x 9 |
Note: Banks 2 & 3 are located on the external memory card. |
CACHE CONFIGURATION | |||
Size | Bank 0 | Bank 1 | TAG |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | ||||
Size | JP8 | JP9 | JP10 | JP11 |
64KB | Open | Open | Open | Open |
256KB | Closed | Closed | Closed | Closed |
CPU TYPE CONFIGURATION | |||
Type | JP5 | JP6 | JP7 |
80486SX | pins 1 & 2 closed | pins 2 & 3 closed | Open |
80486DX | pins 2 & 3 closed | pins 1 & 2 closed | Closed |