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From: chips@usfvax2.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Amiga vs. IBM-PC: A Performance Query
Message-ID: <771@usfvax2.UUCP>
Date: Tue, 26-May-87 14:01:18 EDT
Article-I.D.: usfvax2.771
Posted: Tue May 26 14:01:18 1987
Date-Received: Wed, 27-May-87 05:27:13 EDT
References: <127@belfry.sandiego.NCR.COM> <1913@cbmvax.cbmvax.cbm.UUCP>
Organization: AT Engineering, Tampa, FL
Lines: 32
Summary: 8086 emulation on '286 is not slower

In article <1913@cbmvax.cbmvax.cbm.UUCP>, daveh@cbmvax.cbm.UUCP (Dave Haynie) writes:
> in article <127@belfry.sandiego.NCR.COM>, geoffk@belfry.sandiego.NCR.COM (Geoffrey Kim) says:
> > Having been a previous PeeCee owner (pitiful, aren't I?)  I
> > was just curious how the Amiga rates in terms of performance?
> The 80286, however, takes a small performance hit when running
> programs larger than 64K, and a big performance hit when manipulating 
> data objects greater than 64K in size.

All too true.

> Also, most current 80286 systems are running in 8088 emulation mode, which
> is another big performance hit.  Because of this, the Amiga will sometimes
> run up to 3x the speed of an AT on CPU bound tasks.
> -- 
> Dave Haynie     Commodore-Amiga    Usenet: {ihnp4|caip|rutgers}!cbmvax!daveh
> "The A2000 Guy"                    BIX   : hazy

The reports of reduced performance are greatly exaggerated... :-)

The '286 runs faster in real (8086) mode than in protected ('286) mode.
In protected mode, the '286 does several memory reads on every segment register
load.  Real (8086) mode does not suffer this penalty, but then, neither does it
provide memory management.

The real (:-) problem with real mode is the real-mode OS -- MS-Doesn't.
I believe that too many people would throw out the baby ('286) with the
bathwater (MS-DOS).  Try Xenix on a fast AT and then judge.

-- 
Chip Salzenberg		    Address: "{gatech,cbatt,akgua}!usfvax2!ateng!chip"
AT Engineering, Tampa, FL   Redress: "chips@usfvax2.UUCP"
"Use the Source, Luke!"	    My opinions do not necessarily agree with anything.