zork

Who could forget Zork’s opening: “You are standing in an open field west of a white house, with a boarded front door. There is a small mailbox here.” The text-based parser would respond to your directions, such as “Open mailbox” or even just “open”. Actually, the parser was quite advanced for the genre, as it was able to handle conjunctions and prepositions, such as “open the mailbox and read the leaflet,” and had a wide array of verbs and nouns that it recognized. Of course, if you tried a command that it didn’t know, the parser would just respond with, “I don’t understand that” or a pre-programmed witty response if you tried something the programmers anticipated you would, like typing in “jump” and getting “Wheeee!!!” as a response. For fun, type in any of the following: zork, win, repent, yell, and see what the parser says back.