The part number of each Award & AMI BIOS usually contains information identifying the chipset it supports, and the manufacturer. This information appears at the bottom of your screen after power on, during memory count up.
Copy down your BIOS id string EXACTLY when it appears on your screen. Better yet, dump it to the printer (Print screen key). The PAUSE key should work at that point, allowing you to read the part number, the BIOS date, and the version.
Unfortunately, in some cases, the manufacturer removes that information. Then your only recourse is to contact the board manufacturer.