[COLUG] first Unix with demand-paged virtual memory

Rick Troth rmt at casita.net
Sun Dec 2 23:55:49 EST 2007


Amdah'ls UTS presumably always had demand-paged virtual memory
and it started life circa 1982.

I remember when working at a university
getting into a "my Unix is better than your Unix" argument
with a Berzerkeley afficionado.  (I don't like to stay too firmly
in either camp, but in this particular discussion I was on the
AT&T side.)  He swore that AT&T lacked virtual memory.
But the only AT&T Unix I had known (two or three by that time)
had always had virtual memory.  For my part, I was surprised
that Berkeley Unix had virtual memory as far back as he claimed.

-- R;

On Sun, 2 Dec 2007, jep200404 wrote:

> Is the claim that the AT&T PC 7300 (aka UNIX-PC aka 3B1) had the first
> Unix with demand-paged virtual memory? It seems hard to believe.
>
> In http://www.linuxjournal.com/node/1005754, I see the following:
>
>    Let's not forget the first Unix with demand-paged virtual memory:
>    the AT&T PC 7300 (or UNIXPC). It had 1MB RAM, 4MB virtual memory,
>    10 MHz 68010, SysVR3, loadable drivers, and email, among other things.
>    It even had primitive windowing.
>
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