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From: crandell@ut-sally.UUCP (Jim Crandell)
Newsgroups: net.arch
Subject: Re: Arbitrary byte alignment
Message-ID: <20@ut-sally.UUCP>
Date: Tue, 16-Oct-84 00:16:39 EDT
Article-I.D.: ut-sally.20
Posted: Tue Oct 16 00:16:39 1984
Date-Received: Wed, 17-Oct-84 19:30:48 EDT
References: <393@ism780.UUCP>
Organization: U. Texas CS Dept., Austin, Texas
Lines: 12

> Actually, the 1620 addressed its digits in even/odd pairs and, although
> an address had no restriction to be even or odd, there was a performance
> gain by aligning on a pair boundary.  I guess that makes it a decadent
> machine (I know several people who would agree with that estimation).

Almost.  Instructions had to start at even addresses, and the performance
advantage (which was all of 10 musec -- 1 cycle -- on, for example,
TF and TR) applied only to the Model II.
-- 

    Jim Crandell, C. S. Dept., The University of Texas at Austin
               {ihnp4,seismo,ctvax}!ut-sally!crandell