I've got one mainboard. Its northbridge is vt8601t, southbridge is 82c686b. I checked freebios source , there exists mainboard vt5426 which is very near my configuration. the northbridge and southbridge of vt5426 are seperately vt8601 and 82c686. Who know the difference between them?

By the way , where can I get the manual of vt8601t and 82c686b? I have checked via website, there is no deep technical information about them.