EUGENE, Ore.--William Boyd, president of the University of Oregon, has asked the state attorney general's office for help in investigating a credit scandal in the university's athletic department.

The scandal broke in December, when it became known that four football players received credit last summer for courses they had never taken. That disclosure prompted the resignation of an assistant football coach and raised the possibility that the university would forfeit its winning football season.

Since then, investigators have learned that a member of the diving team may also have received credit for a course for which he did no work.

The Federal Bureau of Investigation has requested copies of the athletic department's telephone logs, suspecting that athletes had free use of the university's long-distance telephone lines.