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Code: The Hidden Language of Computer Hardware and Software Charles Petzold
Publisher: Microsoft Press

(The notation “APL\360″, since the backslash was the APL “expansion” operator, also had a hidden meaning: “APL expands the 360″). The Annotated Turing is proving to be just as interesting. Breed says of the time just before,. Make Software, Change the World! Although other matrix-oriented symbol systems existed, including . Iverson in 1957 as a mathematical notation, not as a computer programming language. October 05, 2012 5 What eventually became APL was first invented by Harvard professor Kenneth E. Petzold's book, Code: The Hidden Language of Computer Hardware, is a must read for any software developer and is my favorite computer-related book. What do flashlights, the British invasion, black cats, and seesaws have to do with computers? Another reference that's handy and helpful, although not a programming book per se is Charles Petzold's Code: The Hidden Language of Computer Hardware and Software.