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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. 4am  🎃‏ @a2_4am 29 Apr 2017

      Trap-A-Zoid, Apple II, ©1983 DesignWare. Unpreserved. You literally trap Zoids with trapezoids. It's adorable.pic.twitter.com/Quk4sbtxiN

      2 replies 10 retweets 25 likes
    2. 4am  🎃‏ @a2_4am 29 Apr 2017
      Replying to @a2_4am

      There's an unusually thorough demonstration mode when you first boot.pic.twitter.com/CnZi9PrBIV

      1 reply 4 retweets 9 likes
    3. 4am  🎃‏ @a2_4am 29 Apr 2017
      Replying to @a2_4am

      The original disk came to me badly damaged. After 16 tries, I finally got a good read of the final bad sector, T22,S0C. Here it is.pic.twitter.com/nudf8mDFJD

      3 replies 11 retweets 24 likes
    4. Erik Fichtner‏ @unixronin 29 Apr 2017
      Replying to @a2_4am

      have you considered writing a cdparanoia-style bad sector copier?

      2 replies 0 retweets 0 likes
    5. John Brooks‏ @JBrooksBSI 30 Apr 2017
      Replying to @unixronin @a2_4am

      Yes, two problem cases are targeted by new bit copier(s) and disk image format(s): 1) Image copy-protection data 2) Image failing-disk data

      1 reply 0 retweets 2 likes
    6. Rich Felker‏ @RichFelker 30 Apr 2017
      Replying to @JBrooksBSI @unixronin @a2_4am

      I think with such a format you can emulate the drive on a much lower level, thereby bypassing all copy protect.

      2 replies 0 retweets 0 likes
    7. 4am  🎃‏ @a2_4am 30 Apr 2017
      Replying to @RichFelker @JBrooksBSI @unixronin

      It's harder than it sounds. Protection schemes exploited every edge case -- track length, cross-track alignment, drive behavior (weakbits)

      1 reply 0 retweets 3 likes
    8. Rich Felker‏ @RichFelker 30 Apr 2017
      Replying to @a2_4am @JBrooksBSI @unixronin

      But if the image format were just a high-res oversampling of the whole disk surface & the emulator emulated the drive's physical behavior...

      2 replies 0 retweets 1 like
    9. Brendan G Bohannon‏ @cr88192 30 Apr 2017
      Replying to @RichFelker @a2_4am and

      half wondering if one could connect a modified floppy drive up to an ADC; then do an audio-like recording of all the bits (at a lower RPM).

      1 reply 0 retweets 0 likes
    10. Rich Felker‏ @RichFelker 30 Apr 2017
      Replying to @cr88192 @a2_4am and

      Yes, but I'm not clear if it would be sufficient, not being an expert in how the actual copy protect schemes worked.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 30 Apr 2017
      Replying to @RichFelker @cr88192 and

      E.g. head positioning might not be sufficiently precise to capture enough data to emulate intentional failure modes used in copy protection.

      7:17 AM - 30 Apr 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Brendan G Bohannon‏ @cr88192 30 Apr 2017
          Replying to @RichFelker @a2_4am and

          could micro-step the head to some off-track positions and also record these?... wondering about a good MCU for this though.

          1 reply 0 retweets 0 likes
        3. Brendan G Bohannon‏ @cr88192 30 Apr 2017
          Replying to @cr88192 @RichFelker and

          would likely need an MCU with both analog input pins and enough RAM to hold useful amounts of data, which seems a little harder IME...

          1 reply 0 retweets 0 likes
        4. Brendan G Bohannon‏ @cr88192 30 Apr 2017
          Replying to @cr88192 @RichFelker and

          looking, seems probably easier to stream the bits over serial from MCU real-time than finding one w/ enough RAM for a full sampled track.

          0 replies 0 retweets 0 likes
        5. End of conversation

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