Re: Hmmm ... Downloaded Xenix - But It's 41 Floppies Worth

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From	John Ames <commodorejohn@gmail.com>
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Subject	Re: Hmmm ... Downloaded Xenix - But It's 41 Floppies Worth
Date	Thu, 4 Sep 2025 07:48:25 -0700
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On Wed, 3 Sep 2025 23:09:49 -0000 (UTC)
Lawrence D’Oliveiro <ldo@nz.invalid> wrote:

> Apple managed it without DMA. And remember their floppies had higher 
> capacity than IBM’s.

True, but it's much harder to do precise timing on an 8088 than a 6502;
the combination of prefetch queue obscurity (which *is* calculable, in
a sufficiently tight loop) and DRAM refresh (which isn't) yields a lot
of uncertainty wrt. real-world execution times.

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Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Theo <theom+news@chiark.greenend.org.uk> - 2025-09-03 11:10 +0100
  Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth The Natural Philosopher <tnp@invalid.invalid> - 2025-09-03 11:55 +0100
  Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth antispam@fricas.org (Waldek Hebisch) - 2025-09-03 14:13 +0000
    Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-03 23:11 +0000
    Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Alexander Schreiber <als@usenet.thangorodrim.de> - 2025-09-04 10:10 +0200
    Re: slow computers, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth John Levine <johnl@taugh.com> - 2025-09-06 17:38 +0000
      Re: slow computers, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Peter Flass <Peter@Iron-Spring.com> - 2025-09-06 15:16 -0700
        Re: slow computers, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth John Levine <johnl@taugh.com> - 2025-09-06 22:39 +0000
          Re: slow computers, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth geodandw <geodandw@gmail.com> - 2025-09-06 18:46 -0400
            Re: slow computers, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth John Levine <johnl@taugh.com> - 2025-09-06 23:00 +0000
              Re: slow computers, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth geodandw <geodandw@gmail.com> - 2025-09-07 15:57 -0400
          Re: slow computers, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth geodandw <geodandw@gmail.com> - 2025-09-06 18:48 -0400
          Re: slow computers, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth c186282 <c186282@nnada.net> - 2025-09-07 04:11 -0400
          Re: slow computers, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Dan Espen <dan1espen@gmail.com> - 2025-09-07 14:43 -0400
            Re: slow computers, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Peter Flass <Peter@Iron-Spring.com> - 2025-09-08 08:10 -0700
  Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-03 23:09 +0000
    Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth John Ames <commodorejohn@gmail.com> - 2025-09-04 07:48 -0700
      Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-04 20:51 +0000

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