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Re: IBM system/360 ad

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On 2019-11-26, David Wade <g4ugm@dave.invalid> wrote:

> On 25/11/2019 21:20, hancock4@bbs.cpcn.com wrote:
>
>> https://archive.org/details/Nations-Business-1964-12/page/n51
>> 
>> Available with up to 8 meg of memory!
>> 
>> (I thought S/360 could handle up to 16 meg?  But maybe in those
>> days no one could see needing more than 8 meg.  Indeed, I think
>> if you wanted that much you had to get the "LCS" which was
>> core but slow core.)
> 
> The ARCHITECTURE could support up to 16Mb and indeed the 360/67 could 
> support more, but physically, most 360's could only interface to smaller 
> amounts of RAM and only implemented a subset of the address lines.
> In addition if it spread out too far the propogation delays will slow 
> the machine down.
>
> For example a 360/40 could have up to 256k and I think a 360/67 could go 
> up to 2048k. There is a picture of a 360/67 with 512k here:-
>
> http://history.cs.ncl.ac.uk/anniversaries/40th/images/ibm360_672/slide07.html
>
> The core is in the four cabinet right at the back. When I used that 
> machine it had been upgraded to 1024K so had 8 of the big double cabinets.
>
> The functional characteristics manuals which cover the specs are here:-
>
> http://www.bitsavers.org/pdf/ibm/360/funcChar/

Yours must have been an older machine.  The 360/67 we had at UBC
had 256K in each cabinet.  The above manual describes this as two
128K units per cabinet.

Although propagation delays were a factor, I suspect that marketing
was as well.  Some shops had to go to a larger CPU than they needed
in order to get enough memory.  Third-party suppliers were quick to
jump in.  I once used a 360/30 that had 128K of memory, even though
you could only go to 64K on a stock machine.  A switch and indicator
light for the extra address bit was placed in an unused portion of
the panel.

I once read about how Greyhound Computer Corporation would buy
360/30s that came off lease and add memory to them.  Apparently
you could get up to 512K if you wanted.

-- 
/~\  cgibbs@kltpzyxm.invalid (Charlie Gibbs)
\ /  I'm really at ac.dekanfrus if you read it the right way.
 X   Top-posted messages will probably be ignored.  See RFC1855.
/ \  "Alexa, define 'bugging'."

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IBM system/360 ad hancock4@bbs.cpcn.com - 2019-11-25 13:20 -0800
  Re: IBM system/360 ad Quadibloc <jsavard@ecn.ab.ca> - 2019-11-25 15:07 -0800
    Re: IBM system/360 ad Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2019-11-26 01:22 +0000
      Re: IBM system/360 ad hancock4@bbs.cpcn.com - 2019-11-27 12:54 -0800
        Re: IBM system/360 ad Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2019-11-28 18:08 +0000
      Re: IBM system/360 ad Ahem A Rivet's Shot <steveo@eircom.net> - 2019-11-28 09:44 +0000
        Re: IBM system/360 ad Peter Flass <peter_flass@yahoo.com> - 2019-11-28 11:04 -0700
  Re: IBM system/360 ad Anne & Lynn Wheeler <lynn@garlic.com> - 2019-11-25 14:41 -1000
    Re: IBM system/360 ad scott@slp53.sl.home (Scott Lurndal) - 2019-11-26 01:31 +0000
    Re: IBM system/360 ad hancock4@bbs.cpcn.com - 2019-11-27 12:49 -0800
      Re: IBM system/360 ad Andy Burns <usenet@andyburns.uk> - 2019-11-27 21:23 +0000
        Re: IBM system/360 ad hancock4@bbs.cpcn.com - 2019-11-27 13:39 -0800
          Re: IBM system/360 ad J. Clarke <jclarke.873638@gmail.com> - 2019-11-27 18:18 -0500
            Re: IBM system/360 ad Alexander Schreiber <als@usenet.thangorodrim.de> - 2019-12-02 00:23 +0100
              Re: IBM system/360 ad scott@slp53.sl.home (Scott Lurndal) - 2019-12-02 15:37 +0000
      Re: IBM system/360 ad David LaRue <huey.dll@tampabay.rr.com> - 2019-11-28 03:16 +0000
  Re: IBM system/360 ad David Wade <g4ugm@dave.invalid> - 2019-11-26 21:35 +0000
    Re: IBM system/360 ad Bob Eager <news0073@eager.cx> - 2019-11-26 22:21 +0000
    Re: IBM system/360 ad Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2019-11-26 22:50 +0000
      Re: IBM system/360 ad David Wade <g4ugm@dave.invalid> - 2019-11-27 00:41 +0000
        Re: IBM system/360 ad Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2019-11-27 05:49 +0000
          Re: IBM system/360 ad David Wade <g4ugm@dave.invalid> - 2019-11-27 11:22 +0000
            Re: IBM system/360 ad Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2019-11-27 19:54 +0000
              Re: IBM system/360 ad hancock4@bbs.cpcn.com - 2019-11-27 13:05 -0800
          Re: IBM system/360 ad hancock4@bbs.cpcn.com - 2019-11-27 13:04 -0800
            Re: IBM system/360 ad Anne & Lynn Wheeler <lynn@garlic.com> - 2019-11-27 13:11 -1000
            Re: IBM system/360 ad Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2019-11-28 18:08 +0000
              Re: IBM system/360 ad J. Clarke <jclarke.873638@gmail.com> - 2019-11-28 13:28 -0500
                Re: IBM system/360 ad Quadibloc <jsavard@ecn.ab.ca> - 2019-12-01 13:16 -0800
                Re: IBM system/360 ad Niklas Karlsson <anksil@yahoo.se> - 2019-12-03 15:14 +0000
                Re: IBM system/360 ad hancock4@bbs.cpcn.com - 2019-12-04 13:01 -0800
              Re: IBM system/360 ad Dan Espen <dan1espen@gmail.com> - 2019-11-28 19:41 -0500

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