From: Dave Horsfall <dave@horsfall.org>
To: The Eunuchs Hysterical Society <tuhs@tuhs.org>
Subject: Re: [TUHS] Old mainframe I/O speed (was: core)
Date: Sat, 23 Jun 2018 16:08:23 +1000 (EST) [thread overview]
Message-ID: <alpine.BSF.2.21.999.1806231550410.68981@aneurin.horsfall.org> (raw)
In-Reply-To: <CE5AFD89-9E9E-41DD-A243-6DD471B54B2A@alchemistowl.org>
[-- Attachment #1: Type: text/plain, Size: 794 bytes --]
On Thu, 21 Jun 2018, Arrigo Triulzi wrote:
>> for the microcode to customers. There were several hacks in there to
>> slow down the disk I/O so that it didn't outperform the model 30.
>
> Is this the origin of the lore on “the IBM slowdown device”?
If I remember my computer lore correctly, wasn't the difference between
the Cyber 72 and the 73 just a timing capacitor, if you knew which board?
And I still reckon that the olde 360/20 (I did see the console for one)
should never have been part of the 360 series;
* It had a HALT instruction!
* It had about half the instruction set.
* Half the number of registers, and width.
* Floating point? What's that?
Etc. A triumph of marketing over engineering...
-- Dave, who did his CompSci thesis on the 360...
next prev parent reply other threads:[~2018-06-23 6:08 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-15 15:25 [TUHS] core Noel Chiappa
2018-06-15 23:05 ` Dave Horsfall
2018-06-15 23:22 ` Lyndon Nerenberg
2018-06-16 6:36 ` Dave Horsfall
2018-06-16 19:07 ` Clem Cole
2018-06-18 9:25 ` Tim Bradshaw
2018-06-19 20:45 ` Peter Jeremy
2018-06-19 22:55 ` David Arnold
2018-06-20 5:04 ` Peter Jeremy
2018-06-20 5:41 ` Warner Losh
2018-06-20 8:10 ` [TUHS] Old mainframe I/O speed (was: core) Greg 'groggy' Lehey
2018-06-20 16:33 ` Paul Winalski
2018-06-21 3:05 ` Peter Jeremy
2018-06-21 14:00 ` Paul Winalski
2018-06-21 14:49 ` Arrigo Triulzi
2018-06-21 20:39 ` Paul Winalski
2018-06-22 5:32 ` Erik E. Fair
2018-06-22 13:32 ` Clem Cole
2018-06-23 6:08 ` Dave Horsfall [this message]
2018-06-23 17:02 ` ron minnich
2018-06-22 13:11 Noel Chiappa
2018-06-22 17:49 ` Erik E. Fair
[not found] <mailman.1.1529690481.3725.tuhs@minnie.tuhs.org>
2018-06-23 10:32 ` Johnny Billquist
2018-06-23 11:39 ` Clem cole
2018-06-24 7:50 ` Mutiny
2018-06-27 13:59 ` Clem Cole
2018-06-24 3:14 Norman Wilson
2018-06-24 13:03 ` Paul Winalski
2018-06-24 14:41 ` Lawrence Stewart
2018-06-24 15:47 ` Arthur Krewat
2018-06-24 18:49 Norman Wilson
2018-06-24 18:49 Norman Wilson
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