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Groups > comp.os.linux.misc > #72343
| From | John Levine <johnl@taugh.com> |
|---|---|
| Newsgroups | comp.os.linux.misc, alt.folklore.computers |
| Subject | Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth |
| Date | 2025-08-26 20:25 +0000 |
| Organization | Taughannock Networks |
| Message-ID | <108l56v$77t$2@gal.iecc.com> (permalink) |
| References | <e4ucnb1I-5IIqur1nZ2dnZfqnPudnZ2d@giganews.com> <20250826083118.00001403@gmail.com> <108kqnu$615d$1@dont-email.me> <mh6aa9Ft773U1@mid.individual.net> |
Cross-posted to 2 groups.
According to Ted Nolan <tednolan> <tednolan>: >>That also depends on one's definition of "proper MMU". The 286 had a >>segmented MMU, but lacked a paged MMU. Paging was not added until the >>386. And there are some that define "proper MMU" as "paged MMU". > >I don't know the MMU details for the 286, but my undestanding (formed >at the time) is that it was "proper" in that it could actually protect >running programs from each other. It could, but if your programs used more than one segment for code or data, the switching was extremely slow and painful. Since the segments were of variable size, that meant operating systems had to do free space compaction that paging systems don't need. > PC-IX and I presume Xenix worked >on the 8088/8086 by having the C compiler emit code which stayed >in a segment -- so programs wouldn't interfere with each other There was 286 Xenix that used multiple segments in protected mode. I never used it. >What the 286 couldn't do was virtual memory, which the 386 could. Sure it could. The system could mark segments as nonresident and take a fault and swap them in as needed. I wouldn't call that very good virtual memory, but it's definitely virtual memory. -- Regards, John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies", Please consider the environment before reading this e-mail. https://jl.ly
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Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Johnny Billquist <bqt@softjar.se> - 2025-08-26 14:04 +0200
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth The Natural Philosopher <tnp@invalid.invalid> - 2025-08-26 13:13 +0100
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Johnny Billquist <bqt@softjar.se> - 2025-08-26 15:23 +0200
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth The Natural Philosopher <tnp@invalid.invalid> - 2025-08-26 19:43 +0100
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth John Ames <commodorejohn@gmail.com> - 2025-08-26 08:31 -0700
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth "Kerr-Mudd, John" <admin@127.0.0.1> - 2025-08-26 17:52 +0100
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth John Ames <commodorejohn@gmail.com> - 2025-08-26 10:01 -0700
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth The Natural Philosopher <tnp@invalid.invalid> - 2025-08-26 19:44 +0100
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Rich <rich@example.invalid> - 2025-08-26 17:26 +0000
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth ted@loft.tnolan.com (Ted Nolan <tednolan>) - 2025-08-26 17:47 +0000
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth scott@slp53.sl.home (Scott Lurndal) - 2025-08-26 18:19 +0000
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth John Levine <johnl@taugh.com> - 2025-08-26 20:25 +0000
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth The Natural Philosopher <tnp@invalid.invalid> - 2025-08-26 21:44 +0100
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth ted@loft.tnolan.com (Ted Nolan <tednolan>) - 2025-08-26 21:12 +0000
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth antispam@fricas.org (Waldek Hebisch) - 2025-08-27 22:09 +0000
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-27 23:00 +0000
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth antispam@fricas.org (Waldek Hebisch) - 2025-08-28 09:10 +0000
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth "Carlos E.R." <robin_listas@es.invalid> - 2025-08-28 13:02 +0200
Re: Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth The Natural Philosopher <tnp@invalid.invalid> - 2025-08-28 12:17 +0100
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth John Levine <johnl@taugh.com> - 2025-08-26 20:21 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Alexander Schreiber <als@usenet.thangorodrim.de> - 2025-08-27 16:40 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth John Ames <commodorejohn@gmail.com> - 2025-08-27 08:30 -0700
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Alexander Schreiber <als@usenet.thangorodrim.de> - 2025-08-28 10:09 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth "Kerr-Mudd, John" <admin@127.0.0.1> - 2025-08-27 19:04 +0100
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-27 22:58 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth c186282 <c186282@nnada.net> - 2025-08-28 04:06 -0400
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-27 22:58 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth c186282 <c186282@nnada.net> - 2025-08-28 03:26 -0400
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Peter Flass <Peter@Iron-Spring.com> - 2025-08-28 15:56 -0700
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-29 00:58 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-08-29 06:50 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth The Natural Philosopher <tnp@invalid.invalid> - 2025-08-29 10:50 +0100
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Alexander Schreiber <als@usenet.thangorodrim.de> - 2025-08-29 12:46 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Richard Kettlewell <invalid@invalid.invalid> - 2025-08-29 14:28 +0100
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Bob Eager <news0009@eager.cx> - 2025-08-29 14:40 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Alexander Schreiber <als@usenet.thangorodrim.de> - 2025-08-29 23:13 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-30 03:28 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-08-29 23:51 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-30 03:27 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth c186282 <c186282@nnada.net> - 2025-08-30 00:25 -0400
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth cross@spitfire.i.gajendra.net (Dan Cross) - 2025-08-30 12:19 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth "Carlos E.R." <robin_listas@es.invalid> - 2025-08-31 13:37 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Alexander Schreiber <als@usenet.thangorodrim.de> - 2025-08-31 18:23 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth rbowman <bowman@montana.com> - 2025-08-31 17:37 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth candycanearter07 <candycanearter07@candycanearter07.nomail.afraid> - 2025-08-30 18:30 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-30 22:20 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Alexander Schreiber <als@usenet.thangorodrim.de> - 2025-08-31 18:25 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth "Carlos E.R." <robin_listas@es.invalid> - 2025-08-29 14:53 +0200
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth John Levine <johnl@taugh.com> - 2025-08-29 17:09 +0000
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth The Natural Philosopher <tnp@invalid.invalid> - 2025-08-29 19:18 +0100
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-08-29 23:51 +0000
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth rbowman <bowman@montana.com> - 2025-08-30 05:54 +0000
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth c186282 <c186282@nnada.net> - 2025-08-30 03:06 -0400
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth The Natural Philosopher <tnp@invalid.invalid> - 2025-08-30 08:28 +0100
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth c186282 <c186282@nnada.net> - 2025-08-30 05:30 -0400
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth The Natural Philosopher <tnp@invalid.invalid> - 2025-08-30 11:59 +0100
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth c186282 <c186282@nnada.net> - 2025-08-30 08:26 -0400
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth rbowman <bowman@montana.com> - 2025-08-30 20:36 +0000
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth rbowman <bowman@montana.com> - 2025-08-30 20:31 +0000
Re: PC/IX, Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth The Natural Philosopher <tnp@invalid.invalid> - 2025-08-30 08:13 +0100
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth scott@slp53.sl.home (Scott Lurndal) - 2025-08-29 22:27 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Johnny Billquist <bqt@softjar.se> - 2025-08-29 21:12 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth ted@loft.tnolan.com (Ted Nolan <tednolan>) - 2025-08-29 20:52 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-29 23:34 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Johnny Billquist <bqt@softjar.se> - 2025-08-30 11:51 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth scott@slp53.sl.home (Scott Lurndal) - 2025-08-30 15:54 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Peter Flass <Peter@Iron-Spring.com> - 2025-08-30 12:13 -0700
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth ted@loft.tnolan.com (Ted Nolan <tednolan>) - 2025-08-30 19:27 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Peter Flass <Peter@Iron-Spring.com> - 2025-08-30 14:45 -0700
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Rich Alderson <news@alderson.users.panix.com> - 2025-08-30 19:34 -0400
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth "Carlos E.R." <robin_listas@es.invalid> - 2025-08-31 13:44 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Johnny Billquist <bqt@softjar.se> - 2025-08-30 11:49 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth ted@loft.tnolan.com (Ted Nolan <tednolan>) - 2025-08-30 17:39 +0000
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Johnny Billquist <bqt@softjar.se> - 2025-08-31 12:40 +0200
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Peter Flass <Peter@Iron-Spring.com> - 2025-08-31 08:19 -0700
Re: Unix on x86, Hmmm ... Downloaded Xenix - But It's *41* Floppies Worth Johnny Billquist <bqt@softjar.se> - 2025-08-31 20:10 +0200
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