Computer punch card

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From the invention of computer programming languages up to the mid-1980s, many if not most computer programmers created, edited and stored their programs line by line on punched cards. Retro Computer Screen Aesthetic, Computer Punch Card, Components Of Computer, Retro Computer Screen, 1960s Computer, Computer Programming Languages, Vintage Computer, Computer Design, Computer Programmer

Museum's explanation on side reads something like this in English: "Punchcard Each thread is represented by a specific dot location on each card. Each hole controls the lifting of the hook which carries and guides the warp thread so that the weft will either lie above or below it. The lace's basic pattern (one repetition) is as long as the punchcard chain." Original: "Lochkarte Auf jeder Lochkarte hat jeder Kettfaden seinen Platz. Jede Lochkarte steuert das Heben der Kettfâden fûr einen…

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Punch card code, from IBM 29 Card Punch Reference Manual. Computer History Museum, Mandelbrot Fractal, Mechanical Calculator, Old Computer, Computer History, Programming Code, Digital Museum, Old Computers, Punch Cards

How do you boot a computer from punch cards when the computer has no operating system and no ROM? To make things worse, this computer requires special metadata called "word marks" that can't be represented on a card. In this blog post, I describe the interesting hardware and software techniques used in the vintage IBM 1401 computer to load software from a deck of punch cards. (Among other things, half of each card contains loader code that runs as each card is read.) I go through some IBM…

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