Re: Precision control on an 80x87

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#412

From: Charles Marslett
Date: Mon, 27 Nov 1989 04:20

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In article <912@maytag.waterloo.edu>, dmurdoch@watstat.waterloo.edu (Duncan Murdoch) writes:
>   00 - 24 bits
>   01 - (reserved)
>   10 - 53 bits
>   11 - 64 bits
> Does anyone know what setting it to 01 is supposed to do?  Is it something new
> on the 287, 387 or 486?

I think the 387 (and 486) actually lose the ability to calculate in any but
the 64 bit mode -- the two bits are just a little bit of RAM.  Any one with
technical docs handy to check on that?

> Duncan Murdoch

Technical Details

Message-ID: <10351@attctc.Dallas.TX.US>

Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!attctc!chasm

References: <912@maytag.waterloo.edu>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!attctc!chasm
From: chasm@attctc.Dallas.TX.US (Charles Marslett)
Newsgroups: alt.msdos.programmer,comp.sys.ibm.pc
Subject: Re: Precision control on an 80x87
Summary: Loss, not gain
Message-ID: <10351@attctc.Dallas.TX.US>
Date: 27 Nov 89 04:20:16 GMT
References: <912@maytag.waterloo.edu>
Followup-To: alt.msdos.programmer
Organization: The Unix(R) Connection, Dallas, Texas
Lines: 13

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