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From: g-inners@gumby.UUCP
Newsgroups: net.micro.mac
Subject: Re: Harmonic Series Benchmark
Message-ID: <385@gumby.UUCP>
Date: Sun, 26-May-85 09:29:24 EDT
Article-I.D.: gumby.385
Posted: Sun May 26 09:29:24 1985
Date-Received: Wed, 29-May-85 23:39:11 EDT
References: <1353@amd.UUCP>
Organization: U of Wisconsin CS Dept
Lines: 16

> He also stated the right answer was 9.787613 determined from a Vax 11/780
> taking 0.02 seconds.
> 
> Now either I'm doing it wrong or something, because I didn't get that
> answer on an IBM 3081.  But anyway, here is my results, with the
> actual output of the Macintosh using Mac C from Consulair.
> ----------------------------------------------------------------------

I suspect the difference (9.787613 vs 9.787606) is due to differences
in the number of bits of precision.  The VAX has one bit more precision
in many cases due to the 'implied one' immediately after the binary
point.  Since normalized mantissa's always start with a '1' bit, the
VAX doesn't store it.  It stores another bit at the end instead.

The the VAX result is probably better than the 3081 or Mac.
				-- Mike Inners