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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 27 Feb 2019
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      Apparently people (like @arstechnica) think USB-IF is messing up their versioning but... it's *literally worked like this all along*. USB 2.0 never meant "480mbps High Speed". You can have a USB 2.0 low-speed 1.5Mbps device. People just *thought* it did. https://arstechnica.com/gadgets/2019/02/usb-3-2-is-going-to-make-the-current-usb-branding-even-worse/ …pic.twitter.com/kiU3ofiXxq

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    2. Hector Martin‏ @marcan42 27 Feb 2019
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      Come on @arstechnica, you literally wrote an article about this in 2003! Check your archives!https://arstechnica.com/uncategorized/2003/10/2927-2/ …

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      Hector Martin‏ @marcan42 27 Feb 2019
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      My mouse is very much a USB 2.0 *low-speed 1.5mbps* device. This is how it has always worked! That is not to say that USB-IF's approach isn't a confusing mess, especially with the speed names (LS/FS/HS/SS/SS+)... but it's been a *consistent* confusing mess from the very start.pic.twitter.com/NE9sBg9STQ

      3:10 AM - 27 Feb 2019
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      • Thomas A Marco Nika Marisa noom hell writes memory initialization code for fun not saint Vincent
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        1. Hector Martin‏ @marcan42 27 Feb 2019
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          @DrPizza, might want to amend the article? I mean you're right it's confusing, but it's not new or different from what USB-IF have been doing until now.

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        2. Steve‏ @littlesteve 27 Feb 2019
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          Replying to @marcan42

          Anyone who has spent 2 minutes with a micro controllers data sheet would have come across it. Many micro controllers have USB blocks that support LS/FS only but are very much USB2.0

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        3. Hector Martin‏ @marcan42 27 Feb 2019
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          Replying to @littlesteve

          I think the confusion stems from *host controllers*. I think a USB X.0 compliant host controller is actually required to support all speeds for that version. Same for hubs. But devices can use whatever they want.

          0 replies 0 retweets 0 likes
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        2. Billy O'Neal‏ @MalwareMinigun 27 Feb 2019
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          Replying to @marcan42

          That's not a problem because a mouse can't meaningfully use more bandwidth than that. It becomes a problem when such things are allowed to affect hosts and cables. If your motherboard has a USB 2.0 port, you can plug any USB 2.0 device into it with any USB 2.0 cable, and it works

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        3. Billy O'Neal‏ @MalwareMinigun 27 Feb 2019
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          Replying to @MalwareMinigun @marcan42

          Same with 3.0. But with 3.1, lots of 3.1 devices just don't work even with USB 3.1 hosts and cables, because those things were no longer required to be interoperable.

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