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    How to Ctrl, Alt, Esc, Shift?

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      Tap and hold. Some keys change behaviour whether they are used in a combination or alone. For example A on hold works like LShift and ; works as RShift on hold.

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        So to type a capital A I would hold ; and press A?

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          Exactly. I have slightly bigger keyboard (48 keys) and for example I use space as both - Space on tap and AltGr on hold.

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      Where’s the citation for “natural resting position of your hands”? Conventional ergonomic advice is that your arms should be straight out in front of you and not bent in, like this keyboard forces you to do.

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        The only way I can imagine typing on a keyboard with my arms straight out in front of me is with a split keyboard. One half of the keyboard directly in front of each shoulder, so that my arms don’t have to come in at all.

        On every computer keyboard I’ve ever seen, the alphabetical part is narrower than my shoulders, and my arms have to point inward to type on it. If you know of any that don’t do this, and don’t resemble a piano keyboard, I’d be interested to see them.

        Edit: I can also imagine typing with just one hand, and having the keyboard directly in front of the my shoulder on the side I’m typing on. Something like Douglass Engelbart’s chorded keyboard, although even that had a typewriter-style keyboard between the shoulders for writing longer text.

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          with a split keyboard

          That’s the point - if it’s more ergonomic for your arms to be straight out, you would need a split keyboard. However, if it didn’t matter, then you would definitely want a non-split and angled keyboard, because split keyboards come with several downsides. That’s why I was wondering what the evidence said - because that’s needed in order to decide which style is optimal.

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            I’m not sure which is more ergonomically optimal, but I am sure that both are better than a typerwriter-style keyboard. My work space isn’t big enough for a split keyboard, so I’m making a custom angled keyboard, heavily inspired by the Atreus. (I am debating having just 3 rows instead of 4. Edit: My 3-row layout looks quite a lot like jklp’s; I might just use it.)

            Fuel for the “which is better” fire: NASA’s Neutral Body Posture diagram shows the posture of a completely relaxed human under zero-g. It indicates that the neutral shoulder position is 54 degrees out from straight-forward, and the neutral elbow position is 88 degrees from straight-arm. (Both angles are from a directly-overhead view.) This places the hands roughly directly in front of the shoulders, pointing inwards. Of course, on Earth gravity would pull the elbows down and in, which might bring the ergonomically-gentlest hand locations closer together.

            Edit: On second thought, my workspace is probably big enough for a split keyboard, but I want to be able to carry this keyboard around and use it on top of a laptop keyboard, so it’s still going to be angled.

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              Thanks for linking to that NASA diagram; that’s fascinating. I also held the mistaken impression that “straight out from the shoulders” was a neutral position.

              Very interesting to see that’s not the case and that bending the elbows is natural. It turns out that bringing the hands together as required by a non-split keyboard doesn’t actually require anything but a small adjustment at the shoulders; the elbows can remain in the neutral position.

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              split keyboards come with several downsides

              Like extra wires, or something else?

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                Either extra wires or the problems that come with wireless (need batteries, interference, pairing), more difficult to manage two separate physical pieces, and it might be more difficult to “anchor” the separate pieces than a single piece.

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                  Back in the day before The Virus, it used to be common for people to work from coffee shops rather than staying at home all day. =)

                  When I got my Ergodox, I used to take it with me to coffee shops when I’d go out, but it was awkward to set up and didn’t always fit at my table, so I stopped taking it with me after a while. But I hated using my internal laptop keyboard after getting spoiled by something with mechanical keys and a column-staggered layout, so I built a non-split board like the OP, and it was a huge improvement.

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            Mhh, I fear the requirement of ALPS-style switches makes this a rather niche endevour given how common MX-switches and their clones are. The clear advantage over an Atreus is the configurability of the angle between the halves.

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              they feel so good tho

              Anyway, it’s 36 keys. There’s no way this project would ever be anything but niche.

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                Says the inventor of a keyboard with just 6 keys more that seemingly has found its niche in… Clojure programmers.

                I’ve finished my Atreus this week (thanks!) with Kailh Box Jades. Never typed on ALPS, I just always hear about their superiority.

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                  Honestly for clicky switches you can find pretty close equivalents in MX, (I’m using Kailh light greens right this moment and ISTR box jades are close to that) but for non-clicky switches I still haven’t found anything quite the same. Personally I’ve never seen the appeal of 3rd-party keycap sets since … why would you want anything other than blanks? (Edit: unless it’s those incredible historic beige 1990s Apple caps in the pics for the OP of course) But I understand the rest of the market disagrees.

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              What about key ghosting[1] in such keyboard solution?

              [1] https://drakeirving.github.io/MultiKeyDisplay/

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                The usual solution is to add a diode after every switch.

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                  What @C-Keen said. Each of the blue-gray segments in this wiring diagram corresponds to a diode: