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From: john@hp-pcd.UUCP (john)
Newsgroups: net.micro.pc
Subject: Re: Re: V20 Over-hyped
Message-ID: <13600001@hpcvla.UUCP>
Date: Tue, 26-Nov-85 12:49:00 EST
Article-I.D.: hpcvla.13600001
Posted: Tue Nov 26 12:49:00 1985
Date-Received: Sat, 7-Dec-85 05:02:03 EST
References: <1002@mcnc.UUCP>
Organization: Hewlett-Packard - Corvallis, OR
Lines: 21
Nf-ID: #R:mcnc:-100200:hpcvla:13600001:000:855
Nf-From: hpcvla!john    Nov 26 09:49:00 1985

<<<<<
> 
> My experience with the V20 is that it speeds things up about
> 4-7%.  It's nice to have the 186 instruction set if you're an
> assembly language programmer, and may come in handy if you have a
> CP/M fetish or other sad perversion, but don't anybody believe
> the "10-40%" nonsense that you see bandied about in the ads.
>

What some people tend to forget is that the V20 has the same 8 bit
Data buss as the Intel 8088. The Execution unit may be 10-40% faster
but that means that the processor finishes earlier and spends more
time waiting for the Buss interface to fetch the next byte. If you
want to evaluate the effect of the NEC Execution unit then you must
compare the V30 with the I-8086. Doubling the speed of the portion 
of a system that is not the bottleneck does not double the speed of
the system.

John Eaton
!hplabs!hp-pcd!john