Groups > alt.folklore.computers > #235575

Re: segments and architectural experimentation (was Re: segments, was Self-hosting and the 6502)

From	Peter Flass <Peter@Iron-Spring.com>
Newsgroups	alt.folklore.computers, sci.electronics.design, comp.arch
Subject	Re: segments and architectural experimentation (was Re: segments, was Self-hosting and the 6502)
Date	2026-09-11 07:29 -0700
Organization	A noiseless patient Spider
Message-ID	<118138b$2vdoe$1@dont-email.me> (permalink)
References	(1 earlier) <10qf1h8$2t6ig$3@dont-email.me> <10qjid9$4i72$1@paganini.bofh.team> <10qkmi4$13ne$1@gal.iecc.com> <qIwzR.283807$FE1.49542@fx20.iad> <87wlssca7y.fsf_-_@debian>

Cross-posted to 3 groups.

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On 9/11/26 04:13, Kragen Javier Sitaker wrote:
> scott@slp53.sl.home (Scott Lurndal) writes:
>> When I started at Burroughs, they had just started a project
>> to increase amount of memory that could be accessed by
>> an application on the medium systems (B3500) line.    The
>> B3500 had a flat one million digit address space and
>> could run in ‘control state’ or ‘normal state’.  When the
>> base register had the value zero, the processor ran in
>> control state and privileged instructions were available,
>> otherwise the processor was is normal state and the
>> 1md address space started at the privileged base register and
>> ended at the privileged limit register.
> 
> That’s an interesting approach!  I had no idea how the Medium Systems
> line worked.

This is not an unusual approach. Many systems of the time used the same, 
I know of the GE 400 line, and I believe the CDC 6x00.>

Thread

Re: Self-hosting and the 6502 Lev <thresh3@fastmail.com> - 2026-03-30 23:32 +0000
  Re: Self-hosting and the 6502 snipeco.2@gmail.com (Sn!pe) - 2026-03-31 00:36 +0100
    Re: Self-hosting and the 6502 Lev <thresh3@fastmail.com> - 2026-03-31 03:08 +0000
      Re: Self-hosting and the 6502 Peter Flass <Peter@Iron-Spring.com> - 2026-03-31 07:45 -0700
        Re: Self-hosting and the 6502 Bob Eager <news0009@eager.cx> - 2026-03-31 14:56 +0000
  Re: Self-hosting and the 6502 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-30 23:38 +0000
    Re: Self-hosting and the 6502 antispam@fricas.org (Waldek Hebisch) - 2026-04-01 16:50 +0000
      Re: segments, was Self-hosting and the 6502 John Levine <johnl@taugh.com> - 2026-04-02 03:07 +0000
        Re: segments, was Self-hosting and the 6502 scott@slp53.sl.home (Scott Lurndal) - 2026-04-02 16:21 +0000
          segments and architectural experimentation (was Re: segments, was Self-hosting and the 6502) Kragen Javier Sitaker <kragen@canonical.org> - 2026-09-11 08:13 -0300
            Re: segments and architectural experimentation (was Re: segments, was Self-hosting and the 6502) Peter Flass <Peter@Iron-Spring.com> - 2026-09-11 07:29 -0700
            Re: segments and architectural experimentation (was Re: segments, was Self-hosting and the 6502) john larkin <jl@glen--canyon.com> - 2026-09-11 07:55 -0700
              Re: segments and architectural experimentation (was Re: segments, was Self-hosting and the 6502) David Schultz <david.schultz@earthlink.net> - 2026-09-11 13:06 -0500
            Re: segments and architectural experimentation (was Re: segments, was Self-hosting and the 6502) someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-14 16:45 +0000
  Re: Self-hosting and the 6502 David Wade <g4ugm@dave.invalid> - 2026-03-31 09:01 +0100
    Re: Self-hosting and the 6502 Bob Eager <news0009@eager.cx> - 2026-03-31 09:49 +0000
  Re: Self-hosting and the 6502 Peter Flass <Peter@Iron-Spring.com> - 2026-03-31 07:31 -0700
    Re: Self-hosting and the 6502 cross@spitfire.i.gajendra.net (Dan Cross) - 2026-03-31 23:45 +0000
      Re: Self-hosting and the 6502 Peter Flass <Peter@Iron-Spring.com> - 2026-03-31 17:15 -0700
        Re: Self-hosting and the 6502 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-01 01:27 +0000
          Re: Self-hosting and the 6502 Peter Flass <Peter@Iron-Spring.com> - 2026-03-31 19:24 -0700
            Re: Self-hosting and the 6502 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-01 03:01 +0000
              Re: Self-hosting and the 6502 Peter Flass <Peter@Iron-Spring.com> - 2026-04-01 07:26 -0700
                Re: Self-hosting and the 6502 "Kerr-Mudd, John" <admin@127.0.0.1> - 2026-04-01 15:54 +0100
                Re: Self-hosting and the 6502 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-01 20:35 +0000
                Re: Self-hosting and the 6502 snipeco.2@gmail.com (Sn!pe) - 2026-04-01 21:49 +0100
                Re: Self-hosting and the 6502 cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-01 16:08 +0000
                Re: Self-hosting and the 6502 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-01 20:34 +0000
                Re: Self-hosting and the 6502 Peter Flass <Peter@Iron-Spring.com> - 2026-04-01 14:29 -0700
                Re: Self-hosting and the 6502 cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-01 22:37 +0000
                Re: Self-hosting and the 6502 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-01 22:52 +0000
        Re: Self-hosting and the 6502 cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-01 13:54 +0000
        Re: Self-hosting and the 6502 antispam@fricas.org (Waldek Hebisch) - 2026-04-01 17:31 +0000
  Re: Self-hosting and the 6502 cross@spitfire.i.gajendra.net (Dan Cross) - 2026-03-31 22:23 +0000

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