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Path: utzoo!watmath!jmsellens
From: jmsellens@watmath.UUCP (John M Sellens)
Newsgroups: net.micro.pc
Subject: "Official" 8087 presence test for IBM's
Message-ID: <16423@watmath.UUCP>
Date: Fri, 13-Sep-85 06:31:26 EDT
Article-I.D.: watmath.16423
Posted: Fri Sep 13 06:31:26 1985
Date-Received: Sat, 14-Sep-85 05:17:50 EDT
Distribution: net
Organization: U of Waterloo, Ontario
Lines: 14

I got a note from IBM the other day, and figuring that it might be of
general interest, and that not everyone will have received a copy,
here is how to find out if a machine has an 80(2)87 installed:

	 int  11H
	 and ax,2
	 jz no_coprocessor

What that means is that on return from an interrupt 11H, bit 1 of the
AX register (i.e. the bit next to the low order bit) will be set if
there is a co-processor installed (and the switches are set right on
the PC/XT/portable mother board).

John