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From: li@mrcnext.cso.uiuc.edu (hans li)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: IRQ 2 on AT-class machines
Message-ID: <li.673350356@mrcnext.cso.uiuc.edu>
Date: 4 May 91 09:45:56 GMT
References: <22603@yunexus.YorkU.CA> <160@thor.sdrc.com> <3WC+R0F@jwt.UUCP>
Sender: usenet@ux1.cso.uiuc.edu (News)
Organization: University of Illinois at Urbana
Lines: 3

On AT class machines irq 2 is used for daisy chaining disk drives.  
IRQ 9 is supposed to be used for networks and other cards.  If you're
running multiple drives, do not use irq 2.