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From: rbl@nitrex.UUCP
Newsgroups: comp.unix.questions
Subject: Re: Vax processors
Message-ID: <502@nitrex.UUCP>
Date: Mon, 3-Aug-87 14:53:41 EDT
Article-I.D.: nitrex.502
Posted: Mon Aug  3 14:53:41 1987
Date-Received: Wed, 5-Aug-87 04:28:21 EDT
References: <138@bernina.UUCP> <13413@topaz.rutgers.edu> <463@mtxinu.UUCP> <3426@cit-vax.Caltech.Edu>
Reply-To: rbl@nitrex.UUCP ( Dr. Robin Lake )
Organization: The Standard Oil Co., Cleveland
Lines: 26

In article <3426@cit-vax.Caltech.Edu> mangler@cit-vax.Caltech.Edu (System Mangler) writes:
>In article <463@mtxinu.UUCP>, ed@mtxinu.UUCP (Ed Gould) writes:
>> (The 8x50 machines are faster versions of the 8x00's, but are otherwise the
>> same.)
>
>  ...
>
>
>Rumor also has it that the 750 was intended as the first VAX, but DEC
>had so much trouble with the 750's LS-TTL gate-array design that they
>ended up selling the engineering prototype (the 780) as a product.
>
>Is there any truth to the legend that the designer of the 750's FPA
>did such a great job that it outran the 780 at floating point, and
>Marketing forced him to divide the clock by two?  Where is the
>jumper?  (Most 750 timings seem to be multiples of 320ns, except a
>few, like writes, that are multiples of 160ns - is this related?)
>
>Don Speck   speck@vlsi.caltech.edu  {ll-xn,rutgers,amdahl}!cit-vax!speck


Stanford University Computer Forum offers up a videotaped lecture on
Design Choices in the VAX-780.  I'll review it as soon as I spin it
up  ---- sometime in the next week or so.

Rob Lake