Blank was frustrated by the computer's tiny vocabulary; when it parsed user inputs very few words were recognized. After thinking about the problem during his undergraduate years, he started work on his own adventure game using MDL, a computer language invented at MIT. Blank and a handful of friends wrote the original version of Zork on a PDP-10 while he was attending medical school at Albert Einstein College of Medicine in New York.
The free-play university version of Zork first became available on the MIT-DM PDP-10 in June 1977. It was then distributed by the Digital Equipment CorporationDECUS program and spread to many colleges in the United States and Canada.
Blank graduated from medical school in 1979 but the call of Zork was irresistible. He and several friends spent the next year developing a specialized computer language that they could use to program text adventures like Zork on the new microcomputers.
The Apple II's limited RAM required them to cut half of the original version of Zork. The new Zork for the Apple and the Radio ShackTRS-80, had a 600-word vocabulary. They founded the new company Infocom to publish the game and more like it.
In 1993 he teamed up with former Infocom writer Michael Berlyn to found Blank, Berlyn and Co.. The company's name was later changed to Eidetic. They initially published productivity software for the Apple Newton. Eidetic's Notion: The Newton List Manager became a hit and was ultimately bundled in all Newtons.
As Newton sales faded, Eidetic changed gears to focus on PC and PlayStation games, producing the hit Syphon Filter in 1999. In 2000 Sony acquired Eidetic for an undisclosed sum.
Marc left Sony in 2004, and is now focused on his email client for the Palm Treo smartphone, ChatterEmail.
On February 22nd 2007, Marc announced he would no longer be "actively" working on ChatterEmail. He has now taken a position with Palm Inc.
