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#baudot — Public Fediverse posts

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  1. Right.
    Let me add that this isn't just about modems, though perhaps their case is the most familiar one.

    Aside, watching the spectrum of a telegraphy channel over time is rather instructive, even on a plain vanilla oscilloscope.
    At low transmission rates, of course, otherwise it's just a blur.
    With a teletype providing a soundtrack.

    Naturally, watching any spectrum is very instructive.
    (It is not for nothing that good spectrum analyzers are expensive.)
    These days, there ought to be plenty of video recordings, but it hadn't occurred to me to look for them.

    I don't know whether the strict definition of _baud_ should be about symbols per second or state changes per second.
    I suppose it might depend on the layer of abstraction of the Discourse.

    _________
    Exploring phase modulation, pulse code modulation, and then the interesting types of modulation etc. (whose names I forget) is left as an exercise for the proverbial reader thirsting for knowledge.
    Warning: it is a rabbit cave, not merely a hole, with multiple branches connected to other large rabbit caves.
    But you would be in the good company of giants.

    #Baud
    #Baudot
    #ContinuousWave
    #Modulation
    #Telegraphy

    @dougmerritt @rl_dane @mirabilos @AmenZwa @kabel42 @raven667 @tut @sjmulder

  2. Visited #BletchleyPark yesterday. Just fantastic!

    I spent the whole day there, 10am - 5pm, and I still didn't manage to see everything!

    I also enjoyed one of the free guided tours with one of the very knowledgeable volunteers who clearly had a lot more to tell than the 1hr allowed.

    For #InternationalWomensDay (3/4 of those at BP were women), there are interactive activities - I really enjoyed writing messages in #Baudot-Murray code and manually punching holes in paper cards.

    #EnigmaMachine

  3. Here is what my tiny BASIC interpreter would write to a five-channel paper tape. There are no characters like < = > or even + or * in the CCITT-2 encoding, so they are replaced with two-character keywords or alternative characters. For example, + is & and * is !. When reading back baudot-encoded programs, these keywords and characters are translated back to their original form.
    #retrocomputing #papertape #BASIC #baudot

  4. The latest prototype of my tiny BASIC interpreter can save programs in CCITT-2 encoding, so it can in theory write programs to 5-channel paper tape. I have a paper tape punch, but it has an RS530 interface, so I need a converter to RS232, which seems to be hard to come by these days. I bought a used one that is supposed to be in "good working condition", but comes without any documentation. Why am I even doing this? :)
    #retrocomputing #papertape #baudot #BASIC