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Infocom was well-known among game-players for their parserA parser is a computer program or a component of a program that analyses the grammatical structure of an input, with respect to a given formal grammar, a process known as parsing. Parsers can be made both for natural languages and for programming language called ZILZork Implementation Language ZIL is the language which Infocom used to produce their works of interactive fiction. See Z-machine. Zavod Imeni Likhocheva (, ZIL Russian: Likhachov Factory) was an automobile factory, which manufactured armored cars for most (Zork Implementation Language or Zork Interactive Language--it was referred to as both) used in its witty, ambitious text adventures, which allowed the user to type complex instructions to the game. Unlike earlier works of interactive fiction, which only understood commands of the form 'verb noun' (e.g. "get apple"), Infocom's parser could understand commands like "get all apples except the green apple from the barrel." Infocom games were written using a programming language that ran on a standardized virtual machineIn general terms, a virtual machine in computer science is software that creates an environment between the computer platform and the end user in which the end user can operate software. Specifically, the term virtual machine has several distinct meanings called the Z-machineThis article is about the Infocom virtual machine. For the x-ray generator, see Z machine. The Z-machine is a virtual machine that was developed by Joel Berez and Marc Blank in 1979 and used by Infocom for its text adventure games. Infocom compiled game c. As the games were text based and used variants of the same Z-machine interpreter, Infocom was able to release most of their games for most popular home computerThe home computer is a consumer-friendly word for the second generation of microcomputers (the technical term that was previously used), entering the market in 1977 and becoming common during the 1980s. The home computer became affordable for the generals of the day simultaneously—the Apple II familypersonal computers of the 1980s. As can be seen, the Apple II came with an integrated keyboard, common with early personal computers, but very uncommon today. The one pictured is shown with two official Apple floppy disk drives and a monitor. The Apple II, Atari 800, IBM PC compatibles, Commodore 64, Commodore 128¹, the Mac, Atari ST, and the Commodore Amiga. The company was also known for shipping creative props, or " feelies" (and even "smellies"), with its games.