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oe1cxw's profile
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩
@oe1cxw

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Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩

@oe1cxw

Neurodiverse trans geek girl. Yosys, RISC-V, SAT/SMT.

She/her/hers
clairexen.net
Joined September 2014

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    1. Matt Parker‏ @standupmaths 9 Jul 2018
      • Report Tweet
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      Matt Parker Retweeted Simon Koppel

      Many people made the “long cable” joke; only one person did the maths.https://twitter.com/SimonKoppel/status/1016245526910693376 …

      Matt Parker added,

      Simon Koppel @SimonKoppel
      Replying to @standupmaths
      You just need a suitable HDMI cable. By my reckoning, a cable 35,975,094,960 metres long should work for a 2 minute delay.
      9 replies 15 retweets 212 likes
    2. Gregg J‏ @GreggJaskiewicz 9 Jul 2018
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      Replying to @standupmaths

      Hdmi protocol is full of back and forth and some security negotiatons. So this wouldn’t work. It’s not a simple one way stream of data :-)

      1 reply 0 retweets 4 likes
    3. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 9 Jul 2018
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      Replying to @GreggJaskiewicz @standupmaths

      That's not true. There is only back-and-forth on the i2c bus embedded in the same cable. The actual hdmi protocol has no handshake and no return channel.

      1 reply 0 retweets 2 likes
    4. Gregg J‏ @GreggJaskiewicz 9 Jul 2018
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      Replying to @oe1cxw @standupmaths

      My telly can control my Apple TV over the hdmi. So obviously the data flows both directions

      1 reply 0 retweets 0 likes
    5. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 9 Jul 2018
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      Replying to @GreggJaskiewicz @standupmaths

      A HDMI cable contains TMDS for video, and i2c for the low speed DDC stuff, a pin that is shared for CEC, HEC, and audio return, a ground pin, a +5V pin and a hotplug detect pin that's also used for HEC.

      1 reply 0 retweets 2 likes
    6. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 9 Jul 2018
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      Replying to @oe1cxw @GreggJaskiewicz @standupmaths

      TMDS is the only signal relevant for video. You'd just need to delay the TMDS signals. There is no return channel on TMDS. Your remote uses CEC.

      1 reply 0 retweets 1 like
    7. Gregg J‏ @GreggJaskiewicz 9 Jul 2018
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      Replying to @oe1cxw @standupmaths

      Thanks Clifford. That’s literally more than I knew about HDMI. Point still stands tho, whole cable - if so long, wouldn’t just impact the digital video signal :-)

      1 reply 0 retweets 1 like
      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 9 Jul 2018
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      Replying to @GreggJaskiewicz @standupmaths

      You can just drive the TMDS signals and leave the rest unconnected. Works just fine. (I did that a few times with custom video signal sources I built.) Even if you'd connect the rest, the system will probably act as if they're unconnected if it sees no response within short time.

      7:53 AM - 9 Jul 2018
      1 reply 0 retweets 0 likes
        1. Gregg J‏ @GreggJaskiewicz 9 Jul 2018
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          Replying to @oe1cxw @standupmaths

          interesting !

          0 replies 0 retweets 0 likes
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