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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Casey Muratori‏ @cmuratori Jul 8

      This is the most awesome demo I've ever seen. You may have heard that the Commodore 64 had a second CPU in its disk drive. But you've probably never seen anyone prove it quite like this:https://www.youtube.com/watch?v=zprSxCMlECA …

      26 replies 150 retweets 662 likes
    2. Volker ∞/21M‏ @volker_btc Jul 8
      Replying to @cmuratori @ajtowns

      Not only did the floppy drive have a CPU, it was the same type as the main CPU but ran twice as fast (2 MHz vs 1)

      1 reply 2 retweets 3 likes
      Casey Muratori‏ @cmuratori Jul 9
      Replying to @volker_btc @ajtowns

      I had a C64 but I was too young to know anything about it. Having learned (much later) that the disk drive had a 2mHz 6502, I always wondered, was there a reason for that? Why not put the faster CPU in the actual computer, and/or why couldn't the disk drive use a cheaper part?

      12:41 AM - 9 Jul 2021
      • 4 Likes
      • david null LauRRRRRent Gideon Ung
      1 reply 0 retweets 4 likes
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        2. Volker ∞/21M‏ @volker_btc Jul 9
          Replying to @cmuratori @ajtowns

          The disk drive had to physically control the read/write mechanism (read bits off the floppy, eun error correction etc) AND run the comms protocol to the host. The host only needed to run the protocol. Both were basically maxed out 😆

          1 reply 0 retweets 2 likes
        3. Zellyn Hunter  💉²  🎉‏ @zellyn Jul 9
          Replying to @volker_btc @cmuratori @ajtowns

          Well, the Apple II did faster disk access with no CPU in the disk drive, so I'm not sure that's completely correct. It did completely max out the main CPU during disk access, and it did have a very clever state machine in ROM. Also, no disk sharing between machines.

          1 reply 0 retweets 1 like
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