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From: milo@ndmath.UUCP (Greg Corson)
Newsgroups: comp.sys.mac
Subject: Floating point Fortran
Message-ID: <155@ndmath.UUCP>
Date: Sun, 7-Dec-86 16:32:03 EST
Article-I.D.: ndmath.155
Posted: Sun Dec  7 16:32:03 1986
Date-Received: Mon, 8-Dec-86 03:29:39 EST
Organization: Math. Dept., Univ. of Notre Dame, Notre Dame, IN
Lines: 21
Keywords: Fortran Hyperdrive 2000 68881 floating point

I have been working on a porting a large fortran (don't flame me...I didn't
write it) graphics package to the Mac.  Recently I had a chance to run it on
a Hyperdrive 2000 system which has the 68881 floating point chip.  The program
was compiled in Microsoft (aka Absoft) Fortran 77.

The problem is that there does not appear to be a way to get Microsoft Fortran
to recognize the floating point chip!  Hyperdrive patches the SANE calls to
use the 68881 floating point but Microsoft fortran does not call SANE (it has
it's own floating point library).

A "use hardware floating point" option is briefly mentioned in the manual,
however this option has been removed from the options dialog box in the Mac
version of the compiler so it can't be used.

The graphics program (a hidden-line/surface package) does all its math in
floating point so I am sure the use of the floating point chip would be a
big help.  Can anyone at Microsoft/Absoft/Apple/Hyperdrive tell me how
to get Microsoft Fortran to recognize the floating point chip?

Greg Corson
...seismo!iuvax!kangaro!milo