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From: Michael S <already5chosen@yahoo.com>
Newsgroups: comp.arch
Subject: Re: Historical evolution of CPU perf
Date: Sat, 12 Oct 2024 21:02:31 +0300
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On Fri, 11 Oct 2024 14:40:59 GMT
scott@slp53.sl.home (Scott Lurndal) wrote:

> Sarr Blumson <sarr@sdf.org> writes:
> >MitchAlsup1 <mitchalsup@aol.com> wrote:  
> >> On Wed, 9 Oct 2024 19:18:40 +0000, Kerr-Mudd, John wrote:
> >>  
> >> I remember the PDP-11/20 in the computer lab at NCR.
> >> Last person out at night would flick the power switch OFF, and
> >> the computer was OFF in 1/60 of a second.
> >> First person in would flick the switch ON and the computer was
> >> back where it was turned off in 1/60 of a second.
> >> 
> >> We used the 11/20 as a remote debug device for the 8085 cash
> >> register machine(s) we were building.  
> >
> >Core memory: slow to access but also slow to forget.  
> 
> Compared to the alternatives at the time, it was the fastest
> gun in the west.
> 

At the time of 11/20 debute (1970) it already was not.
Custom SRAM was in use for 3-4 years and first OTS SRAM (Intel  3031)
was shipping for something like a year.