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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. halvarflake‏ @halvarflake May 16

      The coffee maker in this hotel room has a sticker "with intellibrew" and I would just like the damn thing to work. It is a terrible idea to add 500 million transistors to a device just because you can & it's cheap. Terrible.

      13 replies 19 retweets 78 likes
      Show this thread
    2. whitequark‏ @whitequark May 17
      Replying to @halvarflake @bofh453

      an interesting question: how many transistors is too many? your device probably doesn't have 500 million or even 5, though still a fair bit. a low-end device would have some tens of thousands in an ASIC or a 4/8-bit micro. is that fine? when it becomes not?

      2 replies 0 retweets 5 likes
    3. halvarflake‏ @halvarflake May 17
      Replying to @whitequark @bofh453

      I don't know the answer tbh..

      1 reply 0 retweets 1 like
    4. halvarflake‏ @halvarflake May 17
      Replying to @halvarflake @whitequark @bofh453

      Low end cortex m0 is a few ten thousand gates?

      3 replies 0 retweets 1 like
    5. halvarflake‏ @halvarflake May 17
      Replying to @halvarflake @whitequark @bofh453

      I suspect the right number would be the minimum required to construct the FSM for the machine to perform its functions? Or within an order of magnitude of that minimum?

      1 reply 0 retweets 0 likes
    6. whitequark‏ @whitequark May 17
      Replying to @halvarflake @bofh453

      so what do you do when you find a bug in that FSM? do you respin the ASIC? of course not

      2 replies 0 retweets 3 likes
    7. Rich Felker‏ @RichFelker May 17
      Replying to @whitequark @halvarflake @bofh453

      It doesn't even justify an ASIC; discrete components suffice & would likely dominate cost either way.

      1 reply 0 retweets 0 likes
    8. whitequark‏ @whitequark May 17
      Replying to @RichFelker @halvarflake @bofh453

      good fucking luck making a PID controller out of discrete logic. I for one am glad we aren't stuck in 80s anymore.

      4 replies 0 retweets 2 likes
    9. Rich Felker‏ @RichFelker May 17
      Replying to @whitequark @halvarflake @bofh453

      I think we just have different expectations for what a coffee maker needs to do. :-)

      1 reply 0 retweets 0 likes
    10. whitequark‏ @whitequark May 17
      Replying to @RichFelker @halvarflake @bofh453

      if you're satisfied with open-loop control on anything that heats food, I weep for your standards

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker May 17
      Replying to @whitequark @halvarflake @bofh453

      Heating water is a lot easier than heating food because the water provides all the control you need except stop/fail-safe.

      7:14 AM - 17 May 2018
      0 replies 0 retweets 0 likes

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