Muxcard, a dyi credit card size computer

(github.com)

113 points | by sargstuff 2 days ago

18 comments

  • gnabgib 2 days ago
    Last week (87 points, 7 comments) https://news.ycombinator.com/item?id=48251528
  • cbdevidal 1 hour ago
    What fun!

    I’d love to also go the opposite direction, a full-sized laptop with an ESP32 running tiny386 and Windows 95 ^_^

    https://www.hackster.io/news/he-chunhui-s-tiny386-turns-the-...

  • krauseler 1 hour ago
    Developer here :)

    Just saw this and love how I got the 100th or so "Does it run DOOM?". Even now officially an issue on GitHub. Does that mean I now have to deliver?

    • Muhammad523 52 minutes ago
      > Does that mean I now have to deliver? Well, if you'd like to, you're free to do so! If not, somebody else could do it. You're not your audience's slave

      I know it was intended as a joke but still..

  • asdefghyk 3 hours ago
    This post - the title made me remember ... ( as a credit card is about the same size as a business card )

    A Linux Business Card CD is a miniature, credit-card-sized optical disc containing a stripped-down, bootable Linux operating system. They hold around 50MB to 100MB of data and were highly popular in the early-to-mid 2000s

    More info at https://en.wikipedia.org/wiki/Bootable_business_card

  • WithinReason 1 hour ago
    Coincidentally, the xteink x4 has the same CPU, an e-paper screen and is close to credit card sized.
  • mrbluecoat 1 hour ago
    First thought: cool! Second thought: e-waste

    (same reaction as single-serve coffee pods, circa 2023)

    • krauseler 58 minutes ago
      Good point. Ideally it would be the opposite of waste if it can save you from several cards. But banks would never certify such a multi-card system unless a big company pushes it forward.

      Otherwise I'm sure people might use this to hack some terminals :P

  • stavros 26 minutes ago
    This is great, and I love it, and I hate to be saying this, but it's not literally the size of a credit card, it's 0.2mm thicker.
  • mmmehulll 1 hour ago
    love this. would be cool if we can see and perform all kinds of banking txns on this. Think ledger but all in one card. Super cool. Even cooler would be card to card money transfer without use of swipe machines
    • resonious 1 hour ago
      If "ledger on card" interests you, then you might enjoy Japan's FeliCa cards. They store balance locally on the card so you can pay very quickly, no network required.
  • rbanffy 2 hours ago
    I would love if the screen could take up more space, even at the expense of a little extra thickness.
    • WithinReason 1 hour ago
      That actually exists, with even the same CPU but no NFC: https://www.xteink.com/products/xteink-x4
    • jansan 2 hours ago
      I think that there could be a wider screen if such formats are available. Once we have betavoltaic batteries, the entire card can be screen.
      • rbanffy 2 hours ago
        I'm not sure beta voltaics will ever reach LiPo densities. All materials I know would be unwise to place in your wallet, or anywhere near your body.

        If we are OK with a battery and a beta voltaic source, a tritium one is reasonably safe and can trickle charge the battery when the device is in deep low power mode. The battery can still be charged by the induction coil.

  • ohlookcake 3 hours ago
    Can it run DOOM?
    • krauseler 1 hour ago
      I've got the question like 100 times easily, and I love it.

      And yes, if you accept ~0.7FPS

  • fph 1 hour ago
    How do you recharge it? Do you have to swap the battery?
    • krauseler 1 hour ago
      Hey, developer here :)

      I used an ultra thin LiPo, so you can actually charge it. USB is obviously not an option but it uses magnetic pogo pins on the back side ^^

  • iberator 1 hour ago
    Run Unix v6 on it :) 16 bit and works with like 80kb of ram
  • voidUpdate 4 hours ago
    It seems like it might be a little expensive for a business card...
    • bird0861 1 hour ago
      Let's see Paul Allen's card.
  • thenthenthen 1 hour ago
    Do yourself it!
  • aa-jv 1 hour ago
    I want this, but only for one thing: email.

    I already use an pwnagotchi, and it works great for this - but its a bit bulky.

    If I can get this set up and working, it'll be my main interface to email.

  • suzukivenom 2 hours ago
    legendary
  • pslab 1 hour ago
    [flagged]
  • goodpoint 2 hours ago
    It's not a computer.
    • bigfishrunning 22 minutes ago
      In what way is it not a computer?
    • cbdevidal 1 hour ago
      It’s got more horsepower than my first desktop computer
    • krauseler 1 hour ago
      Right, it doesn't compute. Apologies for the lie.