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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. whitequark‏ @whitequark 30 Jul 2019
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      i'm learning so many things about PS/2 keyboards and mice and literally every single thing about them is incredibly poorly designed

      8 replies 3 retweets 84 likes
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    2. whitequark‏ @whitequark 30 Jul 2019
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      if this is the bar USB had to compete with, yes, USB is actually better, in spite of also being incredibly poorly designed

      3 replies 0 retweets 65 likes
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    3. Jon Roelofs‏ @jon_roelofs 30 Jul 2019
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      Replying to @whitequark

      how did those usb to ps2 adapters work?

      1 reply 0 retweets 0 likes
    4. whitequark‏ @whitequark 30 Jul 2019
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      Replying to @jon_roelofs

      either 1) mouse/keyboard that supports both protocols or 2) an active adapter that has an USB host/PS/2 device inside

      1 reply 0 retweets 1 like
    5. Hector Martin‏ @marcan42 30 Jul 2019
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      Replying to @whitequark @jon_roelofs

      I don't think the latter exist. Even today, USB mice/keyboards very often are still PS/2 compatible. Back in the day it would've been a hilarious waste of money to make active converters like that.

      3 replies 0 retweets 5 likes
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    7. Hector Martin‏ @marcan42 30 Jul 2019
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      Replying to @aptlyamphoteric @whitequark @jon_roelofs

      It's even the only way to get N-key rolllover on many modern keyboards, because it turns out the USB keyboard boot protocol was designed by idiots and limits you to 6 keys, while PS/2 doesn't.

      1 reply 0 retweets 5 likes
    8. Hector Martin‏ @marcan42 30 Jul 2019
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      Replying to @marcan42 @aptlyamphoteric and

      (it's possible to do NKRO over USB, if you break boot protocol compat, but noobdy wants to do that; you can get both with some clever hacks, but it's nontrivial and not documented as a standard)

      2 replies 0 retweets 3 likes
    9. whitequark‏ @whitequark 30 Jul 2019
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      Replying to @marcan42 @aptlyamphoteric @jon_roelofs

      I've read it recently that modern keyboards finally support something other than boot protocol as Windows XP support becomes less of an issue, and so that has NKRO.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 30 Jul 2019
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      Replying to @whitequark @aptlyamphoteric @jon_roelofs

      But BIOSes...

      10:36 PM - 30 Jul 2019
      2 replies 0 retweets 0 likes
        1. 500 internal onee-chan error‏ @toastnotfound 30 Jul 2019
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          Replying to @marcan42 @whitequark and

          Bad BIOS.

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        1. whitequark‏ @whitequark 30 Jul 2019
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          Replying to @marcan42 @aptlyamphoteric @jon_roelofs

          isn't there some way to switch between boot and non-boot protocols? I thought it was just Windows XP that was hilaribad. But I either didn't read the relevant parts of HID in detail or forgot

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 30 Jul 2019
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          Replying to @whitequark @aptlyamphoteric @jon_roelofs

          The problem is stuff that doesn't send the proper SetProtocol request to go into boot mode. https://geekhack.org/index.php?topic=13162.0 …

          1 reply 0 retweets 7 likes
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