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

From	geodandw <geodandw@gmail.com>
Newsgroups	comp.os.linux.misc, alt.folklore.computers
Subject	Re: slow computers, Hmmm ... Downloaded Xenix - But It's 41 Floppies Worth
Date	2025-09-07 15:57 -0400
Organization	A noiseless patient Spider
Message-ID	<109ko2g$3t00b$1@dont-email.me> (permalink)
References	<e4ucnb1I-5IIqur1nZ2dnZfqnPudnZ2d@giganews.com> <109ibrg$3a10s$1@dont-email.me> <109id72$1nq0$1@gal.iecc.com> <109idk1$3aekh$1@dont-email.me> <109iee0$22qi$1@gal.iecc.com>

Cross-posted to 2 groups.

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On 9/6/25 19:00, John Levine wrote:
> According to geodandw  <geodandw@gmail.com>:
>>> It normally only came with a multiplexor channel, which a disk or tape captured
>>> for the length of the operation so it couldn't do disk or tape I/O and any other
>>> I/O at the same time unless you paid extra for a selector channel.
>>>
>>> You could run OS on a 64K /30, but only single threaded PCP, not MFT or MVT.
>> I worked where we had a 360/30 with 96K with DOS. We ran BG plus a
>> spooler in FG.
> 
> The most IBM offered on a /30 was 64K, but I have heard of aftermarket vendors that
> managed to activate another address line or two and put on more memory.  If your
> employer did that, they probably also got the extra cost selector channel that let
> the disk run in parallel with other stuff.
> 
> So I believe you, but that was a fairly unsuual and very large configuration for a /30.
> 
> 
> 
See "Historical Notes" in 
https://ed-thelen.org/comp-hist/ibm-360-30.html  Apparently after an 
aftermarket company did this, IBM did to.

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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

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