Xref: utzoo comp.sys.att:5674 unix-pc.general:2348
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!osu-cis!n8emr!uncle!jbm
From: jbm@uncle.UUCP (John B. Milton)
Newsgroups: comp.sys.att,unix-pc.general
Subject: Re: Floating Point ... A Again
Keywords: MC68881, FPU
Message-ID: <487@uncle.UUCP>
Date: 26 Feb 89 20:37:40 GMT
References: <499@Portia.Stanford.EDU>
Reply-To: jbm@uncle.UUCP (John B. Milton)
Distribution: usa
Organization: U.N.C.L.E.
Lines: 25

In article <499@Portia.Stanford.EDU> jeff@Portia.Stanford.EDU (Jeff McDonald) writes:
...
>Does anyone out there know anything about part #105160253?  Did it ever
>really exist?  How much did it cost?  Was it an expansion board or did
>it piggyback the CPU socket (I think this is feasible)?  Did you need
>new libraries to use it ?
Yes, a prototype does exist. I addressed this in my HwNote07. I will e-mail
a copy to you (or anyone else). The compiler supports it, see cc(1). The
laodable device driver comes with UNIX, see /etc/lddrv/fpa.o. You can't get
the board because it was canceled due to poor performance (only 50% improvement)
It is an expansion board, and the driver uses an F-line emulator to talk to it.

>Please help, I am starving for floating point support.  Also has anyone
>ever tried going to say a 12Mhz crystal?  We have done this here with
>PC/AT's.  If you get the idea I want the fastest UNIX PC in the world,
>maybe your right !!!  Thanks for any info you can provide.
Don't even bother.

John
--
John Bly Milton IV, jbm@uncle.UUCP, n8emr!uncle!jbm@osu-cis.cis.ohio-state.edu
(614) h:294-4823, w:764-2933;  Got any good 74LS503 circuits?