(Twitter Photo via @JohnFPfaff)

They’re gonna love this one at the Apple Genius Bar.

A New York professor took a stroll down memory lane on Twitter over the weekend after discovering a decades-old Apple IIe computer in the attic of his parents’ home. The machine still worked when John Pfaff turned it on, and even prompted him to restore a saved game after he popped a disk into it.

Pfaff figured the machine was probably 30 years old — and that putting hands on it again made him feel 10.

Pfaff, author of “Locked In,” an examination of the U.S. prison system, ended up tweeting throughout the night on Saturday as he tried numerous floppy disks in the 30-year-old computer.

He played a few games, reviewed notes left on disk sleeves and even read a letter on the machine that his late father wrote to him in 1986, when he was 11 and away at summer camp.

Pfaff was also blown away by a retweet from the famed science fiction author William Gibson, who reacted to Pfaff finding a copy of the 1988 game “Neuromancer” — loosely based on Gibson’s 1984 novel of the same name.

Check out more of Pfaff’s tweets:

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