UNIDENTIFIED
80486SX/DX MOTHERBOARD
Processor | 80486SX/80487SX/80486DX |
Processor Speed | 16/20/25/33MHz |
Chip Set | Acer |
Max. Onboard DRAM | 32MB |
SRAM Cache | None |
BIOS | AMI/AWARD |
Dimensions | 230mm x 220mm |
I/O Options | None |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J4 | Turbo LED | J21/pins 1 & 2 |
Reset switch | J19 | Turbo switch | J21/pins 4 & 5 |
Speaker | J20 | Power LED & keylock | J22 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Monitor type select color | JP1 | pins 2 & 3 closed |
Monitor type select monochrome | JP1 | pins 1 & 2 closed |
I/O BUS SPEED CONFIGURATION | |||
Jumper | OSC1/5 | OSC1/6 | OSC1/8 |
JP3 | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed |
JP6 | pins 1 & 2 closed | pins 2 & 3 closed | 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 |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
32MB | (4) 4M x 9 | (4) 4M x 9 |
CPU JUMPER CONFIGURATION | ||
CPU | JP4 | JP5 |
80486SX | open | pins 1 & 2 closed |
80487SX | pins 1 & 2 closed | pins 2 & 3 closed |
80486DX | pins 2 & 3 closed | pins 2 & 3 closed |