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Groups > alt.folklore.computers > #234484
| From | Bob Eager <news0009@eager.cx> |
|---|---|
| Newsgroups | alt.folklore.computers |
| Subject | Re: Self-hosting and the 6502 |
| Date | 2026-03-31 09:49 +0000 |
| Message-ID | <n31jlnF2repU3@mid.individual.net> (permalink) |
| References | <10qf16a$2t7c2$1@dont-email.me> <10qfv01$35cbk$1@dont-email.me> |
On Tue, 31 Mar 2026 09:01:05 +0100, David Wade wrote: > On 31/03/2026 00:32, Lev wrote: >> Bob Eager wrote: >> >>> I studied this back in the early 1970s with a Honeywell 516. >>> It didn't have real memory management, but it had two mode. >>> Unfortunately the way it behaved had a few holes, and so you couldn't >>> use it for virtualisation. >>> >>> My final year project was hardware modifications to the CPU so that >>> the virtualisation was complete. >> >> That's a fascinating data point. You had to modify hardware to close >> the holes - meaning the Popek-Goldberg requirements really were >> requirements, not just theoretical niceties. Did you have to trap >> specific instructions that leaked privileged state, or was it more >> about adding missing mode distinctions? >> >> > To return to Microprocessors, the original 68000 did not satisfy the > Popek-Goldberg requirements, but the later 68010 did, so broke a few > things... > > ... not sure if any software used this.... In case anyone is interested...I don't remember all of it, and I've lost my report, but see here: https://www.bobeager.uk/anecdotes.html#CPUhack -- Using UNIX since v6 (1975)... Use the BIG mirror service in the UK: http://www.mirrorservice.org
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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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