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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
      Show this thread
    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
    6. Manawyrm‏ @Manawyrm 30 Jul 2019
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      Replying to @marcan42 @whitequark @jon_roelofs

      they do exist. I have a single one. But yeah, very rare…

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

      I'm really curious about what's inside one of those. Did they ever make microcontrollers with a USB host back then? Dedicated IC? How much of USB does it implement?

      4 replies 0 retweets 0 likes
    8. Tony Naggs‏ @xa329 30 Jul 2019
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      Replying to @marcan42 @Manawyrm and

      By 2000 there was at least one cheap chip with a low bandwidth USB 1.x serial interface configurable between host & device signalling. The SL811, for unknown reasons still made by Cypress Semi. Do not look at the datasheet if you value your sanity. (😱🥴😵🤯 You were warned.)

      1 reply 0 retweets 0 likes
    9. whitequark‏ @whitequark 30 Jul 2019
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      Replying to @xa329 @marcan42 and

      oh I remember that chip! I was going to make something like it in HDL once I get around to writing an USB stack.

      1 reply 0 retweets 1 like
    10. Tony Naggs‏ @xa329 31 Jul 2019
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      Replying to @whitequark @marcan42 and

      It is an abomination. Possibly useful with a dedicated microcontroller for polling a keyboard or mouse, impossible interrupt per USB packet impact on a MIPS32 trying to run a whole digital tv Set-Top Box. 😭

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 31 Jul 2019
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      Replying to @xa329 @whitequark and

      And I thought UHCI was bad...

      12:18 AM - 31 Jul 2019
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      • Tony Naggs whitequark
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        1. Tony Naggs‏ @xa329 31 Jul 2019
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          Replying to @marcan42 @whitequark and

          But the ping-pong buffers, don't you know? 🤣 Anyway my point is that an SL811 and a low end PIC (or similar) could drive a USB keyboard or mouse sufficiently to convert to a PS/2 interface.

          0 replies 0 retweets 0 likes
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