BSD vs. System V, one last thing...

[Chet Murthy]

In article <553 at umbio.MIAMI.EDU> jherr at umbio.MIAMI.EDU (Jack Herrington) writes:
>no sense to me since unix had it all the way up to V7 as I remember, and they
>scrapped vm for SV.  This utterly confuses me (AT&T has a marvelous way
>of doing that to me).

Actually, v7 didn't have virtual memory built-in.
At least, not paged virtual memory.  sysV diesn't
have it because, as I heard it, it is derived from
PWB/UNIX, and not v7.  PWB was the same UNIX,
so I have heard, that spawned 32v, which went on to
become 2bsd, 3bsd, 4bsd, etc.  However, sysV did
get paging in version V.2.2.  And also in V.3
System V did indeed have swapping, though.  But
then swapping can be done with a minimum of hardware.


	--chet--
	murthy at svax.cs.cornell.edu