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    This is really neat. I once devised the idea of using 2D ones to backup data onto paper for better retention. Later on, QR codes came to do similar stuff with passwords, etc. I never thought about sharing code that way. Not practical but fun for hobbyists. Here’s a recent take on the concept:

    http://www.extremetech.com/extreme/134427-a-paper-based-backup-solution-not-as-stupid-as-it-sounds

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      Back before the internet, and when dialup was still expensive, magazines would publish source code listings and the only way to get it into your computer was to type it in.

      From which era is this? In the 80s we had tv show about computers in Czechoslovakia. During the final credits, instead of music they “played” zx spectrum program you could record to a tape and run. There was also a radio programme.

      I find this technique really neat. Did you have something similar?

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        Wow, neat! I grew up in South Africa and we didn’t have anything similar, unfortunately (well, that I know of!). Source code listings in magazines and books were popular though (most of the books and magazines were imported from the UK/US, however).

        Heck, in the early-mid 80s even PC Magazine used to print source cost listings - when I got into x86 assembly language and C some years later I used to devour those all issues from the local university library (they had them all neatly bound). Reading those old issues today is a fascinating time capsule of a bygone era of home computing.

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          I lived in the US in the 80s, and typing things in from magazines was how I learned to program. I think I might have heard about the audio recording thing, but I was “lucky” as a child to have access to an IBM - one of the most expensive microcomputers of that era - which didn’t have consumer-oriented features like tape storage.

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            didn’t have consumer-oriented features like tape storage

            If by “IBM” you mean an original IBM PC (aka 5150), it did have a tape storage option, although it wasn’t very popular.

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              Hah! It was the PC XT (5160), but I’m sure the tape storage would have worked. I didn’t even know about it. :) It had this new thing called a hard drive, which game manuals would always describe as this very rare case. :)

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          Wow. I thought about this during the time period the article is about (it was an obvious solution, I guess :)), but I didn’t know it was real. I’d have assumed it would be far too expensive for anyone to use.