From: Warner Losh <imp@bsdimp.com>
To: "Greg 'groggy' Lehey" <grog@lemis.com>
Cc: The Eunuchs Hysterical Society <tuhs@tuhs.org>
Subject: Re: [TUHS] One's complement (was: reviving a bit of WWB)
Date: Thu, 24 Sep 2020 18:22:18 -0600 [thread overview]
Message-ID: <CANCZdfpFVWBbexxM2LmO13DGf2BsHKqCTiJig0tZgXqPitHjWQ@mail.gmail.com> (raw)
In-Reply-To: <20200925001859.GC53226@eureka.lemis.com>
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On Thu, Sep 24, 2020 at 6:20 PM Greg 'groggy' Lehey <grog@lemis.com> wrote:
> On Wednesday, 23 September 2020 at 22:33:38 -0400, Clem Cole wrote:
> > Dave: Seymour used ones complement on the 3000 and 6000 series.
> > Maybe there? The primary HLLs I used on the CDC boxes were FTN and
> > Pascal, but I would not be surprised if that was were you saw it.
>
> I think most of the bigger pre-IBM 360 machines used one's complement.
> Didn't the PDP-10? I knew it not only from the CDC 3200 and 3800, but
> primarily from Univac (1108 and 494). The Univac techies explained to
> me that the primary arithmetic function was subtraction; addition was
> subtracting the complement. And that worked faster with one's
> complement.
>
Don't know about the others, but I'm pretty sure PDP-10 wasn't 1's
compliment / was 2's compliment..
Warner
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next prev parent reply other threads:[~2020-09-25 0:22 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-19 1:51 [TUHS] reviving a bit of WWB Doug McIlroy
2020-09-20 18:42 ` arnold
2020-09-20 19:28 ` Will Senn
2020-09-20 20:12 ` Steve Nickolas
2020-09-20 20:26 ` Doug McIlroy
2020-09-20 20:57 ` Doug McIlroy
2020-09-20 22:13 ` Clem Cole
2020-09-21 20:43 ` Steffen Nurpmeso
2020-09-20 20:58 ` Steve Nickolas
2020-09-20 21:33 ` Brantley Coile
2020-10-07 5:43 ` scj
2020-09-20 21:35 ` John Cowan
2021-02-02 23:08 ` Greg A. Woods
2021-02-02 23:47 ` Larry McVoy
2021-02-03 0:11 ` Dave Horsfall
2021-02-03 0:19 ` Larry McVoy
2021-02-03 2:04 ` Richard Salz
2021-02-03 3:32 ` Dave Horsfall
2021-02-03 4:32 ` M Douglas McIlroy
2021-02-03 11:27 ` Peter Jeremy via TUHS
2021-02-03 20:09 ` Dave Horsfall
2021-02-03 20:13 ` Niklas Karlsson
2021-02-03 23:46 ` Tom Lyon
2021-02-03 22:19 ` Dave Horsfall
2021-02-03 22:55 ` M Douglas McIlroy
2020-09-20 22:15 ` Clem Cole
2020-09-20 22:47 ` John Cowan
2020-09-21 20:48 ` Steffen Nurpmeso
2020-09-21 20:46 ` Steffen Nurpmeso
2020-09-24 2:25 ` Dave Horsfall
2020-09-24 2:33 ` Clem Cole
2020-09-25 0:18 ` [TUHS] One's complement (was: reviving a bit of WWB) Greg 'groggy' Lehey
2020-09-25 0:22 ` Warner Losh [this message]
2020-09-25 1:39 ` John Cowan
2020-09-27 5:54 ` [TUHS] reviving a bit of WWB Dave Horsfall
2020-09-24 17:19 ` Paul Winalski
2020-09-24 18:17 ` John Cowan
2020-10-07 5:47 ` scj
2020-10-07 9:20 ` arnold
2020-10-08 0:27 ` Dave Horsfall
2020-10-08 3:08 ` John Cowan
2020-09-25 15:21 [TUHS] One's complement (was: reviving a bit of WWB) Noel Chiappa
2020-09-25 15:30 ` Warner Losh
2020-09-25 16:10 ` Ronald Natalie
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