Re: Is 2.11BSD < 4BSD? It depends. (was: [PATCH v1 2/4] sys/man2/sysctl.2: HISTORY: wfix)

["G. Branden Robinson" <g.branden.robinson@gmail.com>]

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[self-correction]

At 2025-12-30T01:22:34-0600, G. Branden Robinson wrote:
> 2BSD targeted only the PDP-11, and swapped out entire processes just
> as Unix historically always had.
> 
> 3BSD targeted the VAX, and supported demand paging--just as UNIX 32/V,
> the most recent common ancestor of AT&T System III/V and [34]BSD,
> did.[0]

Nope, I mangled my history here.  UNIX 32/V (or just 32V) _did not
implement demand paging_.  It ported Unix to the 32-bit VAX-11
architecture, but continued to swap out entire process's memory images.
You can read more about 32/V in the attachment.

3BSD _did_ implement demand paging and was, rightly, viewed as a major
feather in the cap of the Berkeley CSRG that produced it.

> 4BSD was a relatively minor update to 3BSD,

I'll further qualify that this characterization may apply only if one
cares about operating system kernels.  4BSD also introduced the curses
library, which in its ncurses reimplementation, many *nix system users
still use today.  Even some Windows users do, via PDCurses{,Mod}.

Sorry for my inaccuracies.

Regards,
Branden

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