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In page Assembly language:

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When the stored-program computer was introduced programs were written in machine code, and loaded into the computer from punched paper tape or toggled directly into memory from console switches.[citation needed] Kathleen Booth "is credited with inventing assembly language"[1][2] based on theoretical work she began in 1947, while working on the ARC2 at Birkbeck, University of London following consultation by Andrew Booth (later her husband) with mathematician John von Neumann and physicist Herman Goldstine at the Institute for Advanced Study.[2][3]