How about the original Sid Meier's Pirates! It was around 1987.
My friend would bring over his Apple IIE and we would hook it up to the TV. We'd play all weekend, taking turns sword fighting and controlling the ship battles. We'd also play Wings of Fury and The City for days and days.
Later, we'd get IBM compatible machines, a 286 being my first. Pirates! was still a mainstay. Might and Magic I and II ... later, the Ultima series took over. During a university reading week, my brother and I did absolutely nothing except play Ultima Online and sleep (about 4 hours a day); we even ate while we played. We were hard core addicted but luckily snapped out of it once school started again.
