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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 15:34 +0000
Message-ID <ct7rdh-i61c.ln1@esprimo.zbmc.eu> (permalink)
References (5 earlier) <600a75d7$0$11309$e4fe514c@news.xs4all.nl> <20210122093310.2a6e8bc8@jresid.jretrading.com> <ruejig$gjm$1@dont-email.me> <ruek8f$krd$1@dont-email.me> <ruepg8$riq$1@dont-email.me>

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gareth evans <headstone255@yahoo.com> wrote:
> On 22/01/2021 13:34, The Natural Philosopher wrote:
> > On 22/01/2021 13:22, gareth evans wrote:
[snip]
> 
> ISTR that FORTH on an RCA 1802 is in the Voyager missions?
> 
> Now, that was a weird instruction set! ISTR 8-off 16 bit
> registers but no 16-bit moves, all having to be done in
> 8-bit chunks through the accumulator, and no conventional
> subroutine call but change which of the 16-bit registers
> at any time was the program counter!
> 
I worked on 1802 based systems from 1980 to 1987 in Oman.  It was all
done in assembler, I actually wrote an 1802 macro assember using the
very basic assembler that came with the RCA 1802 developement systems.

As you say it was a very odd instruction set.  You could use any one
of the 16 bit registers as the program counter which could lead to
some very confusing (and difficult to debug) code.

-- 
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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