JOHNSON CITY — There was a time when Appalachian State was East Tennessee State’s biggest football rival. For years, the teams were in the Southern Conference together and the drive over the mountain was an easy one for both fan bases. These days, there’s a lot more than 60 miles separating the programs. Billy Taylor, who went 0-4 against Appalachian State as a player at ETSU, was the Bucs’ defensive coordinator the last time they won in the series.