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

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From	John Levine <johnl@taugh.com>
Newsgroups	comp.os.linux.misc, alt.folklore.computers
Subject	Re: slow computers, Hmmm ... Downloaded Xenix - But It's 41 Floppies Worth
Date	Sat, 6 Sep 2025 17:38:51 -0000 (UTC)
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According to Waldek Hebisch <antispam@fricas.org>:
>DMA transfer was just unwilingness to do more complex implementation.
>PC was no more constained than 360/30, where simultaneous I/O
>and computation was common.

Actually it wasn't.  The /30 shared the microengine between the CPU and
the channel.  When the channel was doing disk I/O the CPU pretty much
stopped.

In practice that was fine, BOS and DOS only ran one program at a time
so it'd usually be waiting for the I/O to finish anyway.
-- 
Regards,
John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly

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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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