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34778Re: [midatlanticretro] S100 Floppy Controller

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  • retro
    Mar 17, 2014
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      A number of posts, suggest that using a UART as a floppy controller in
      early microcomputers was various flavors of unnecessary. The facts are,
      that early microprocessors came before single-chip floppy controllers,
      and floppy drives were around before say the Intel 8080 processor.

      Many of the earliest floppy disk controllers - including for and by
      IMSAI and MITS Altair - were made from either TTL chips with or without
      UARTS, or very early fast microcoded TTL designs, or themselves used the
      earliest microprocessors or microcontrollers. And a whole generation of
      floppy controllers were hard-sectored, because that was simpler to
      manage with such technology.

      This is ground I covered a few years ago:


      There were a generation of floppy controllers before single-chip FDC's
      were available. That was simply the available technology. No shame or
      shortchange in that.

      Herbert R. Johnson
      http://www.retrotechnology.com OR .net
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