Doug Williams of Grambling, the first black to be drafted on the first round to play quarterback exclusively in the National Football League, is in another unique position: He is the only one of 28 NFL picks still unsigned.

He officially became a holdout when he failed to report to the Tampa Bay Buccaneers by Sunday night. He has missed three days of practice.

Williams said from his hometown of Zachary, La., near Baton Rouge, "I am thinking about going to camp happy. We (he and his agent, Jim Walsh) are not going to camp unhappy.

"If I go to training camp and realize I didn't get what I wanted, I wouldn't be concentrating fully on football.

"I'm not itchy about getting to camp; just cool. I know I'm losing valuable time . . . But they (the Buccaneers) do, too. If they don't think so, why should I worry?

"If they really didn't need a quarterback, why did they draft me No. 1? They can play without me, but I feel I can help them. Gary Huff probably will go into the season as the No. 1 quarterback.

"I know I can't go in and be the quarterback overnight. I am ready to work hard; they're not going to put it in my hands."

Williams said he was advised by his agent not to discuss money with the media. "I don't think we are asking for too much. We're in the same neighborhood. Maybe something will happen in the next couple days. Jimmy talked to the Bucaneers Tuesday, but nothing happened."

Tampa Bay traded the top pick in the draft to the Houston Oilers, who selected Heisman Trophy winner Earl Campbell. The Buccaneers got in return the Oilers' first and second-round picks this year, their third and fourth for 1979, and veteran tight end Jimmy Giles.

Williams was selected All-America and led all quarterbacks in the Heisman Trophy voting, finishing fourth overall.

He led the nation in passing as a senior, completing 181 of 352 attempts for 38 touchdowns and 2,229 yards in 11 games and set a National Collegiate Athletic Association career record of 93 touchdowns by passing. Scouting reports on the 6-foot-4, 215-pounder ranked his as the best arm of all college quarterbacks.