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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 26 Dec 2020
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      can someone explain to me why PS/2 has three very similar scan code sets and all of them are cursed beyond belief

      14 replies 5 retweets 88 likes
      Show this thread
    2. William D. Jones‏ @cr1901 26 Dec 2020
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      Replying to @whitequark

      One of them is compatible with the XT scan codes for XT keyboards. This dates back to the PC AT but Idk how to enable it offhand.

      2 replies 0 retweets 6 likes
    3. Random832‏ @Random832 26 Dec 2020
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      Replying to @cr1901 @whitequark

      If you put set 1 in numerical order it looks exactly like an XT keyboard layout. Not sure what to make of the others, but I wonder if it has to do with the physical scan matrix of a Model F and/or Model M keyboard

      2 replies 0 retweets 10 likes
    4. Random832‏ @Random832 26 Dec 2020
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      Replying to @Random832 @cr1901 @whitequark

      Here's set 3 (I think, it's hard to find good sources) as a gridpic.twitter.com/7CJyDefyvH

      3 replies 0 retweets 6 likes
    5. whitequark‏ @whitequark 26 Dec 2020
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      Replying to @Random832 @cr1901

      what... happened to F11 and F12

      1 reply 0 retweets 2 likes
    6. William D. Jones‏ @cr1901 26 Dec 2020
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      Replying to @whitequark @Random832

      Speculating: F11 and F12 weren't part of the original 83-key Model F keyboard or the original 84-key AT keyboard, for that matter. Since AT keyboard protocol is compat w/ PS/2, IBM adding F11/F12 later might have something to do with it?

      3 replies 0 retweets 3 likes
    7. whitequark‏ @whitequark 26 Dec 2020
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      Replying to @cr1901 @Random832

      but isn't set 3 supposed to be the "reasonable" one

      1 reply 0 retweets 2 likes
    8. William D. Jones‏ @cr1901 26 Dec 2020
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      Replying to @whitequark @Random832

      No idea, I'm afraid :(. I'm just speculating that since F11/F12 were added later, IBM had to work within already-existing constraints for scan codes. According to wiki, set 3 predates set 2: https://en.wikipedia.org/wiki/Scancode 

      2 replies 0 retweets 11 likes
    9. whitequark‏ @whitequark 26 Dec 2020
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      Replying to @cr1901 @Random832

      aaaaaaaaaaaaaaa

      1 reply 0 retweets 5 likes
      Hector Martin‏ @marcan42 27 Dec 2020
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      Replying to @whitequark @cr1901 @Random832

      I think the reason for the folding is to keep the number of columns a power of two, so the scancode can just literally be row/col merged bitwise. The physical layout is 6x19 or something, which is annoying, so they fold it to 8x16.

      6:52 AM - 27 Dec 2020
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      • sww1235 Emelia/Emi lisica Neos_muidt ＯＮ｟⩑｠ＡＩＲ Tom, KG4CYX 📡 BLM 𓅭𓅰𓆏 Jed Davis 🏳️‍🌈
      0 replies 0 retweets 6 likes

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