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From: dws@tolerant.UUCP (Dave W. Smith)
Newsgroups: net.micro.68k,net.micro.16k
Subject: Re: Re: Re: PDP11s vs the micros
Message-ID: <141@tolerant.UUCP>
Date: Sun, 1-Sep-85 15:30:41 EDT
Article-I.D.: tolerant.141
Posted: Sun Sep  1 15:30:41 1985
Date-Received: Wed, 4-Sep-85 05:29:19 EDT
References: <1617@hao.UUCP> <847@mako.UUCP> <2422@sun.uucp>, <223@uthub.UUCP> <5900@utzoo.UUCP>
Organization: Tolerant Systems, Inc.  San Jose, CA
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Xref: watmath net.micro.68k:1092 net.micro.16k:380

>> [discussion about saving floating-point-unit state only when needed]
> 
> It should also be possible to get a similar effect by using the SETCFG
> instruction to tell the cpu "no floating point", which will produce a
> trap when the user tries to use floating point.  Save the state and then
> turn floating point on again.  When I asked the local National man about
> ... Beware that I have *not* tried it on real
> hardware yet.
> -- 
> 				Henry Spencer @ U of Toronto Zoology
> 				{allegra,ihnp4,linus,decvax}!utzoo!henry

We do it on real hardware, and it works nicely.
-- 
  David W. Smith             {ucbvax}!tolerant!dws
  Tolerant Systems, Inc.
  408/946-5667