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From: bich@hpsciz.sc.hp.com (Bich Tran)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: IRQ 2 on AT-class machines
Message-ID: <13340001@hpsciz.sc.hp.com>
Date: 7 May 91 17:18:11 GMT
References: <22603@yunexus.YorkU.CA>
Organization: Hewlett-Packard, Santa Clara, CA
Lines: 6

The second one is true: on AT class, IRQ2 is used to cascade the first
interrupt controller to the second one, so AT can handle more thatn just 7 IRQs
Since IRQ2 is re-mapped to IRQ9, software must redirect any IRQ2 request (XT
card) to IRQ9.
Hope this help,
bic