UNIDENTIFIED
486 MOTHER BOARD
Processor | 80486DX/80486DX2 |
Processor Speed | 25/33/50(internal)/66(internal)MHz |
Chip Set | OPTI |
Video Chip Set | None |
Maximum Onboard Memory | 32MB |
Maximum Video Memory | None |
Cache | 64/256KB |
BIOS | AMI |
Dimensions | 220mm x 220mm |
I/O Options | None |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J1 | Turbo LED | JP11 |
Speaker | J17 | Reset switch | SW1 |
Power LED & keylock | J18 | Turbo switch | SW2 |
USER CONFIGURABLE SETTINGS | |||
Function | Label | Position | |
? | CMOS memory normal operation | JP1 | Pins 2 & 3 closed |
CMOS memory clear | JP1 | Pins 1 & 2 closed | |
Monitor type select monochrome | JP2 | Closed | |
Monitor type select CGA/EGA/VGA | JP2 | Open |
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) 1M x 9 | (4) 4M 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 | TAG |
64KB | (8) 8K x 8 | (1) 8K x 8 |
256KB | (8) 32K x 8 | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | |||
Size | JP4 | JP6 | JP7 |
64KB | Open | Open | Open |
256KB | Closed | Closed | Closed |
Note: Above jumpers are shown for location purposes only and may not be exact. |