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From: jmoore@fred.UUCP (Jim Moore)
Newsgroups: net.micro.16k
Subject: Re: Corrigenda
Message-ID: <103@fred.UUCP>
Date: Tue, 26-Feb-85 20:17:14 EST
Article-I.D.: fred.103
Posted: Tue Feb 26 20:17:14 1985
Date-Received: Sun, 3-Mar-85 05:32:29 EST
References: <983@watdcsu.UUCP> <2385@nsc.UUCP> <730@amdcad.UUCP> <2393@nsc.UUCP>
Organization: NBI,Inc, Boulder CO
Lines: 19

> ......... 32bit addressing makes a
> nice marketing tool, granted, but there really isn't much that a 32bit
> address gives you that a 24bit address doesn't also give you in a
> manufactured product EXCEPT a marketing tool. 
> 
> chuq

But addressing is not just for physical memory. Hardware people love
extra address lines for memory-mapped IO. The software folks can avoid
complex allocation algorithms by taking advantage of large virtual
address spaces. Both are legitiment uses for more address lines.

I am not saying that 24 bits is scimpy (sure beats 16), but there
are current micro-based designs that can certainly benefit from the
additional address lines above 24. 

Jim Moore
Integrated Solutions Inc., Boulder Colorado
{ucbvax|hao|amd}!nbires!jmoore