From: Warner Losh <firstname.lastname@example.org>
To: Paul Ruizendaal <email@example.com>
Cc: "firstname.lastname@example.org" <email@example.com>
Subject: [TUHS] Re: virtual consoles / Alt-Fx
Date: Mon, 13 Mar 2023 09:30:03 -0600 [thread overview]
Message-ID: <CANCZdfoJhC1KF2m1=AAVkNxxw0-ub3W+eowYcdFOu36tAuz=6A@mail.gmail.com> (raw)
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On Mon, Mar 13, 2023 at 9:13 AM Paul Ruizendaal via TUHS <firstname.lastname@example.org>
> Thinking a bit more about terminal multiplexing was a major use case for
> early X, I recalled using Linux virtual consoles in the late 90’s for this
> According to Wikipedia, virtual consoles originated with Xenix and before
> that with concurrent CP/M.
> Perusing the documentation of those on Bitsavers, I can see that virtual
> consoles have a prominent mention in the manual for concurrent CP/M (1983),
> but not those of its forerunners MP/M II and MP/M (1979). I cannot find a
> mention of virtual consoles in Xenix documentation as late as 1988.
Venix/86R 1.0 Boston Softwre Works Edition had virtual consoles. It was
released in 1986.
https://groups.google.com/g/mod.newprod/c/iYLc3cdnyms/m/Him5XgqwT70J is a
reference. However, it was inspired by Xenix and Microport System V/AT
according to the author. The stock version of Venix/86R 1.0 didn't have
them, nor did the PC version that we have some sources for. Here's the
relevant bits from the blurb:
Virtual consoles, as found in VENIX on IBM-compatible machines, and also in
XENIX and Microport System V/AT.
But also interesting was:
Support for simultaneous use of a monochrome display (for terminal/console
use) and a color graphics display (for graphics).
which I thought interesting at the time, but was pretty old-school Unix
Workstation by then.
No such thing as a virtual (as distinct from pseudo) tty on 16-bit Unix or
> early 32-bit, as far as I know; one could argue it does not make much sense
> with physical terminals. Wikipedia says no such thing existed on SunOS
> I think virtual consoles where present in Linux from a very early point.
Ditto for the 386BSD BSD/386 line of code. I think they were added in the
patch-kit phase, not the original Jolitz code phase. FreeBSD 1.0 Beta had
them in 1993 for sure, as did NetBSD of the time.
I have a memory of them on 0.98pl13 on Linux as well, but that version
sticks in my head as a proxy for anything between 0.96 (the first one I
tried) and 0.99 (the last before 1.x Linux). This would be approximately
1992 or 1993.
I've not done the deep-dive into the ancient code bases to see if I can
suss out when they arrived.
> So, as far as I can tell virtual consoles were invented for concurrent
> CP/M around 1983, made their way to Xenix in the late 80’s and became part
> of Linux in the early 90’s.
> Have I missed other prior art?
Maybe a little. Good information about Microport System V is kinda hard to
come by these days...
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next prev parent reply other threads:[~2023-03-13 15:30 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-13 15:12 [TUHS] " Paul Ruizendaal via TUHS
2023-03-13 15:24 ` [TUHS] " Clem Cole
2023-03-13 15:27 ` Clem Cole
2023-03-13 16:17 ` Paul Winalski
2023-03-13 15:41 ` Warner Losh
2023-03-13 15:48 ` KenUnix
2023-03-13 15:48 ` Clem Cole
2023-03-13 16:14 ` Dan Cross
2023-03-13 17:26 ` Miod Vallat
2023-03-13 20:35 ` Dan Cross
2023-03-14 16:42 ` Derek Fawcus via TUHS
2023-03-14 22:46 ` Charles H Sauer (he/him)
2023-03-15 4:26 ` Heinz Lycklama
2023-03-13 15:27 ` Ralph Corderoy
2023-03-13 15:30 ` Warner Losh [this message]
2023-03-14 3:27 ` Rik Schneider
2023-03-13 15:33 ` Ron Natalie
2023-03-13 15:45 ` Heinz Lycklama
2023-03-13 17:04 ` Ralph Corderoy
2023-03-13 15:49 ` Brad Spencer
2023-03-17 8:14 ` Marc Donner
2023-03-14 3:33 Rudi Blom
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