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Groups > alt.folklore.computers > #163411

Re: IBM's 96 column punch card (was System/3)?

From jmfbahciv <See.above@aol.com>
Newsgroups alt.folklore.computers
Subject Re: IBM's 96 column punch card (was System/3)?
Date 2016-05-08 13:08 +0000
Organization "Have EDDT, will travel"
Message-ID <PM000532544FAB5CDC@aca41104.ipt.aol.com> (permalink)
References (15 earlier) <qfNWy.2381$vz2.842@fx23.iad> <PM0005322C18AD4A3F@aca40d35.ipt.aol.com> <722Xy.29347$jT2.1724@fx35.iad> <PM000532405D457743@aca40426.ipt.aol.com> <J1tXy.14037$Iu5.1173@fx06.iad>

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Scott Lurndal wrote:
> jmfbahciv <See.above@aol.com> writes:
>>Scott Lurndal wrote:
>
>>>>>
>>>>> I quite enjoyed using our 200IPS GCR drives (rebadged STC, IIRC).  They
>>>>> actually had a higher transfer rate than one of our models of disk
drive,
>>>>> which I found to my consternation when I tested a double-buffering
>>algorithm
>>>>> that didn't bother to wait for write completion (under the assumption
that
>>>>> disks were always faster than tape :-).
>>>>
>>>><GRIN>  Computers always did that to developers.  What did you do to "fix"
>>>>it?
>>>
>>> Waited for the disk write to complete before starting the next
>>> magtape read into the buffer.
>>
>>Would having a buffer ring be too complicated?
>
> Would have been unnecessary, the double buffer algorithm used 100% of
> the device (disk /tape) bandwidth as it was.   Adding more wouldn't have
> improved performance.
>
> This was used in the code that installed the operating system (COLDSTART)
> onto the boot media.

Ah, you were the only one on the system; that makes a differnce.  I was
trying to think of a way to not have to stop the magtape because getting
it started again would take finagling (tapes move when idle).

/BAH

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Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-04-26 11:42 +0000
  Re: IBM's 96 column punch card (was System/3)? Jon Elson <jmelson@wustl.edu> - 2016-04-26 14:36 -0500
    Re: IBM's 96 column punch card (was System/3)? Morten Reistad <first@last.name.invalid> - 2016-04-27 00:42 +0200
      Re: IBM's 96 column punch card (was System/3)? scott@slp53.sl.home (Scott Lurndal) - 2016-04-27 13:48 +0000
        Re: IBM's 96 column punch card (was System/3)? Morten Reistad <first@last.name.invalid> - 2016-04-28 08:41 +0200
    Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-04-27 12:40 +0000
      Re: IBM's 96 column punch card (was System/3)? Andy Burns <feb2017-usenet@adslpipe.co.uk> - 2016-04-27 14:51 +0100
        Re: IBM's 96 column punch card (was System/3)? Jon Elson <elson@pico-systems.com> - 2016-04-27 22:27 -0500
          Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-04-28 12:06 +0000
            Re: IBM's 96 column punch card (was System/3)? Quadibloc <jsavard@ecn.ab.ca> - 2016-04-28 07:49 -0700
              Re: IBM's 96 column punch card (was System/3)? Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2016-04-28 17:03 +0000
                Re: IBM's 96 column punch card (was System/3)? "Osmium" <r124c4u102@comcast.net> - 2016-04-28 12:18 -0500
                Re: IBM's 96 column punch card (was System/3)? Anne & Lynn Wheeler <lynn@garlic.com> - 2016-04-28 11:19 -0700
                Re: IBM's 96 column punch card (was System/3)? hancock4@bbs.cpcn.com - 2016-04-28 14:19 -0700
                Re: IBM's 96 column punch card (was System/3)? "Charles Richmond" <numerist@aquaporin4.com> - 2016-04-29 16:47 -0500
              Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-04-29 12:18 +0000
            Re: IBM's 96 column punch card (was System/3)? Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2016-04-28 17:03 +0000
              Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-04-29 12:18 +0000
                Re: IBM's 96 column punch card (was System/3)? Morten Reistad <first@last.name.invalid> - 2016-04-29 15:14 +0200
            Re: IBM's 96 column punch card (was System/3)? pechter@pechter.net (William Pechter) - 2016-05-03 14:09 +0000
      Re: IBM's 96 column punch card (was System/3)? Jon Elson <elson@pico-systems.com> - 2016-04-27 22:19 -0500
        Re: IBM's 96 column punch card (was System/3)? pechter@pechter.net (William Pechter) - 2016-05-03 14:21 +0000
      Re: IBM's 96 column punch card (was System/3)? pechter@pechter.net (William Pechter) - 2016-05-03 14:03 +0000
        Re: IBM's 96 column punch card (was System/3)? Jon Elson <jmelson@wustl.edu> - 2016-05-03 13:58 -0500
        Re: IBM's 96 column punch card (was System/3)? Jon Elson <jmelson@wustl.edu> - 2016-05-03 14:22 -0500
          Re: IBM's 96 column punch card (was System/3)? pechter@pechter.net (William Pechter) - 2016-05-04 20:21 +0000
        tape drives [was Re: IBM's 96 column punch card (was System/3)?] Rich Alderson <news@alderson.users.panix.com> - 2016-05-03 15:39 -0400
        Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-05-04 13:02 +0000
          Re: IBM's 96 column punch card (was System/3)? Jon Elson <elson@pico-systems.com> - 2016-05-04 11:45 -0500
            Re: IBM's 96 column punch card (was System/3)? Morten Reistad <first@last.name.invalid> - 2016-05-05 01:13 +0200
              Re: IBM's 96 column punch card (was System/3)? Jon Elson <jmelson@wustl.edu> - 2016-05-05 14:25 -0500
                Re: IBM's 96 column punch card (was System/3)? scott@slp53.sl.home (Scott Lurndal) - 2016-05-05 19:34 +0000
                Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-05-06 13:28 +0000
                Re: IBM's 96 column punch card (was System/3)? scott@slp53.sl.home (Scott Lurndal) - 2016-05-06 14:39 +0000
                Re: IBM's 96 column punch card (was System/3)? scott@slp53.sl.home (Scott Lurndal) - 2016-05-06 14:41 +0000
                Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-05-07 13:14 +0000
                Re: IBM's 96 column punch card (was System/3)? Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2016-05-07 16:47 +0000
                Re: IBM's 96 column punch card (was System/3)? Andrew Swallow <am.swallow@btopenworld.com> - 2016-05-07 23:30 +0100
                Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-05-08 13:08 +0000
                Re: IBM's 96 column punch card (was System/3)? Jon Elson <elson@pico-systems.com> - 2016-05-07 16:07 -0500
                Re: IBM's 96 column punch card (was System/3)? scott@slp53.sl.home (Scott Lurndal) - 2016-05-07 21:23 +0000
                Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-05-08 13:08 +0000
                Re: IBM's 96 column punch card (was System/3)? scott@slp53.sl.home (Scott Lurndal) - 2016-05-09 15:13 +0000
                Re: IBM's 96 column punch card (was System/3)? Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2016-05-09 17:05 +0000
                Re: IBM's 96 column punch card (was System/3)? pechter@pechter.net (William Pechter) - 2016-05-09 22:41 +0000
                Re: IBM's 96 column punch card (was System/3)? Morten Reistad <first@last.name.invalid> - 2016-05-10 12:01 +0200
                Re: IBM's 96 column punch card (was System/3)? Peter Flass <peter_flass@yahoo.com> - 2016-05-10 06:42 -0400
                Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-05-10 12:34 +0000
                Re: IBM's 96 column punch card (was System/3)? scott@slp53.sl.home (Scott Lurndal) - 2016-05-10 13:05 +0000
                Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-05-11 12:18 +0000
                Re: IBM's 96 column punch card (was System/3)? scott@slp53.sl.home (Scott Lurndal) - 2016-05-11 13:27 +0000
                Re: IBM's 96 column punch card (was System/3)? Morten Reistad <first@last.name.invalid> - 2016-05-10 15:53 +0200
                Re: IBM's 96 column punch card (was System/3)? jmfbahciv <See.above@aol.com> - 2016-05-11 12:18 +0000
                Re: IBM's 96 column punch card (was System/3)? "Simo" <dhy287@gmail.com> - 2016-05-10 04:56 +1000

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