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:[email protected]] On Behalf Of Curious > Marc > Sent: 05 May 2016 01:07 > To: General Discussion: On-Topic and Off-Topic Posts <[email protected]> > 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 <[email protected]> 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 > >
