5 May
2016
5 May
'16
1:15 a.m.
I thought we were talking Mini Computers. The Ferranti/Manchester Atlas had
virtual memory of a sort which provided protection, and indeed IBM bought
the Virtual Memory patents from Manchester University. I gather the PDP/11
received Memory Mapping boards early in its life, didn't these offer some
protection?
Dave
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Curious
Marc
Sent: 05 May 2016 01:07
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at
classiccmp.org>
Subject: Re: AW: When did Memory- and IO Protection
Emerge (Esp. in
Minis)?
In the not mini but very maxi category, I just learned that IBM
implemented
memory protection as an RPQ (customer feature) at the
request of the MIT
folks that built the first IBM time sharing system (CTSS, the predecessor
of
Multics), on their IBM 7094. Around 1963, unless it
was already
implemented
in the IBM 7090 which would have been 1961. At least
that's my cursory
understanding of it from www.multicians.org/thvv/7094.html . I was very
surprised it was that early!
Marc
Sent from my iPad
> On May 4, 2016, at 3:02 PM, Chuck Guzis <cclist at sydex.com> wrote:
>
> Is the CDC 1700 considered to be in the family of "minicomputers"?
> (i.e. was the word invented before then?).
>
> If so, the 1700 had a rather elaborate system of memory and peripheral
> protection. Circa 1965 (at least that's the date on my manual).
>
> --Chuck
>