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Re: £3.60

From Chris Green <cl@isbd.net>
Newsgroups comp.sys.raspberry-pi
Subject Re: £3.60
Date 2021-01-22 16:02 +0000
Message-ID <5i9rdh-1c4c.ln1@esprimo.zbmc.eu> (permalink)
References (5 earlier) <600a75d7$0$11309$e4fe514c@news.xs4all.nl> <20210122093310.2a6e8bc8@jresid.jretrading.com> <ruejig$gjm$1@dont-email.me> <gs5rdh-42tb.ln1@esprimo.zbmc.eu> <rueqbj$29c$1@dont-email.me>

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gareth evans <headstone255@yahoo.com> wrote:
> 
> First 10 years as a professional softy were PDP11 assembler
> on SCADA systems. Most challenging ISTR was a cassette tape driver
> to run under our own realtime exec.
> 
I was working on SCADA in Oman from 1980 to 1987, the PDP-12 wasn't
SCADA though, it was a in a hospital.


> > I started at a similar time (early 1970s) on a wierd device called the
> > PDP-12 (an odd marriage of a PDP-8 and a university developed machine
> > called a Linc-12).
> 
> Yes, I'm aware of that. Wasn't there some difficulty in on-the-fly
> switching between the two instruction sets? I've the thing described
> in a DEC sales clossy from 1971.
> 
Well it wasn't 'difficult' it was just rather odd because the whole
addressing structure changed, the PDP-8 had 12-bit addresses (i.e.
memory banks were 4k) whereas the Linc machine had 10-bit addresses
(i.e. 1k memory banks).  It was just a single instruction to change
from one mode to the other but the ramifications in addressing etc.
could be quite interesting! :-)

It's all a very long time ago now!

-- 
Chris Green
·

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Thread

£3.60 Andy Burns <usenet@andyburns.uk> - 2021-01-21 15:49 +0000
  Re: £3.60 Nikolaj Lazic <nlazicBEZ_OVOGA@mudrac.ffzg.hr> - 2021-01-21 17:25 +0000
    Re: £3.60 Martin Gregorie <martin@mydomain.invalid> - 2021-01-21 19:39 +0000
      Re: £3.60 Martin Gregorie <martin@mydomain.invalid> - 2021-01-21 20:50 +0000
    Re: £3.60 gareth evans <headstone255@yahoo.com> - 2021-01-21 20:40 +0000
  Re: £3.60 Chris Green <cl@isbd.net> - 2021-01-21 17:21 +0000
    Re: £3.60 gareth evans <headstone255@yahoo.com> - 2021-01-21 20:39 +0000
      Re: £3.60 A. Dumas <alexandre@dumas.fr.invalid> - 2021-01-21 21:51 +0000
        Re: £3.60 gareth evans <headstone255@yahoo.com> - 2021-01-21 22:54 +0000
          Re: £3.60 Martin Gregorie <martin@mydomain.invalid> - 2021-01-22 01:01 +0000
          Re: £3.60 A. Dumas <alexandre@dumas.fr.invalid> - 2021-01-22 06:51 +0000
            Re: £3.60 Joe <joe@jretrading.com> - 2021-01-22 09:33 +0000
              Re: £3.60 gareth evans <headstone255@yahoo.com> - 2021-01-22 13:22 +0000
                Re: £3.60 The Natural Philosopher <tnp@invalid.invalid> - 2021-01-22 13:34 +0000
                Re: £3.60 gareth evans <headstone255@yahoo.com> - 2021-01-22 15:03 +0000
                Re: £3.60 Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2021-01-22 17:19 +0200
                Re: £3.60 gareth evans <headstone255@yahoo.com> - 2021-01-22 15:24 +0000
                Re: £3.60 Martin Gregorie <martin@mydomain.invalid> - 2021-01-22 16:25 +0000
                Re: £3.60 Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2021-01-23 19:56 +0000
                Re: £3.60 Ahem A Rivet's Shot <steveo@eircom.net> - 2021-01-23 20:25 +0000
                Re: £3.60 Martin Gregorie <martin@mydomain.invalid> - 2021-01-23 20:31 +0000
                Re: £3.60 Chris Green <cl@isbd.net> - 2021-01-22 15:34 +0000
                Re: £3.60 Björn Lundin <b.f.lundin@gmail.com> - 2021-01-22 17:17 +0100
                Re: £3.60 Martin Gregorie <martin@mydomain.invalid> - 2021-01-22 16:30 +0000
                Re: Re: £3.60 stephen@mpeforth.com (Stephen Pelc) - 2021-01-22 17:47 +0000
                Re: £3.60 Chris Green <cl@isbd.net> - 2021-01-22 15:00 +0000
                Re: £3.60 gareth evans <headstone255@yahoo.com> - 2021-01-22 15:18 +0000
                Re: £3.60 Chris Green <cl@isbd.net> - 2021-01-22 16:02 +0000
                Re: £3.60 Joe <joe@jretrading.com> - 2021-01-22 20:05 +0000
                Re: £3.60 "A. Dumas" <alexandre@dumas.fr.invalid> - 2021-01-22 16:07 +0100
                Re: Re: £3.60 stephen@mpeforth.com (Stephen Pelc) - 2021-01-22 15:53 +0000
                Re: £3.60 gareth evans <headstone255@yahoo.com> - 2021-01-22 16:17 +0000
                Re: Re: £3.60 stephen@mpeforth.com (Stephen Pelc) - 2021-01-22 17:25 +0000
              Re: £3.60 Scott Alfter <scott@alfter.diespammersdie.us> - 2021-01-22 22:14 +0000
      Re: ??3.60 Jim Jackson <jj@franjam.org.uk> - 2021-01-21 22:04 +0000
    Re: £3.60 Eli the Bearded <*@eli.users.panix.com> - 2021-01-21 21:03 +0000
      Re: £3.60 Theo <theom+news@chiark.greenend.org.uk> - 2021-01-22 10:38 +0000
        Re: £3.60 "A. Dumas" <alexandre@dumas.fr.invalid> - 2021-01-22 16:13 +0100
          Re: £3.60 Eli the Bearded <*@eli.users.panix.com> - 2021-01-22 20:04 +0000
            Re: £3.60 "A. Dumas" <alexandre@dumas.fr.invalid> - 2021-01-22 23:39 +0100
              Re: Re: £3.60 Eli the Bearded <*@eli.users.panix.com> - 2021-01-23 00:23 +0000
                Re: £3.60 Folderol <general@musically.me.uk> - 2021-01-24 19:22 +0000
                Re: £3.60 David Higton <dave@davehigton.me.uk> - 2021-01-25 18:46 +0000
            Re: ??3.60 not@telling.you.invalid (Computer Nerd Kev) - 2021-01-22 23:18 +0000
      Re: £3.60 ray carter <ray@zianet.com> - 2021-01-23 01:53 +0000

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