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Re: £3.60

From Joe <joe@jretrading.com>
Newsgroups comp.sys.raspberry-pi
Subject Re: £3.60
Date 2021-01-22 20:05 +0000
Organization JRE Trading Ltd
Message-ID <20210122200501.64ca98ae@jresid.jretrading.com> (permalink)
References (4 earlier) <rud0ma$hr5$1@dont-email.me> <600a75d7$0$11309$e4fe514c@news.xs4all.nl> <20210122093310.2a6e8bc8@jresid.jretrading.com> <ruejig$gjm$1@dont-email.me> <gs5rdh-42tb.ln1@esprimo.zbmc.eu>

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On Fri, 22 Jan 2021 15:00:00 +0000
Chris Green <cl@isbd.net> wrote:


> > It is 50 years ago this year that I cut my teeth on a naked
> > PDP11/20 with no OS and only an assembler. Everything I did
> > was up to me.
> >   
> Ah, but the normal process would be to enter the boot loader by hand,
> then a bigger/better loader from paper tape and then the actual OS.

Around 1980 I was working on a TV character generator based on the DG
Nova, another mini of that era. It had a rackmount main frame with a
front panel with octal pushbuttons, rather than the imposing row of
switches. About half a dozen manually entered codes, than it fired up
the paper tape reader.
> 
> Or did you actually write naked assembler code to do things direct
> with the hardware?

I wrote a disassembler in machine code, then did some analysis of some
of the supplied programs.

There was an optional one or two hard drives, 1.25MB in those big IBM
cartridges.

The (TTL-based) Nova actually went out of production while I was with
the character generator company, so they made their own using AMD
bit-slice microprocessors, AMD2901, if I recall correctly. I believe DG
also did this for a later Nova model.

-- 
Joe

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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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