Hack © 1984 Fenlason, Jay.
Development began shortly after the 1982 USENIX conference in Boston, MA where the Michael Toy and Ken Arnold (the authors of the then closed-source Rogue) spoke.
The only publication of the original Hack was on a USENIX software distribution tape, apparently the first 1984 USENIX tape (of which no online copy is known to exist), where it accompanied Jon Payne's text editor JOVE.