IRQ 9 instead of IRQ 2 on ISA bus

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#571

From: Henry Gessau
Date: Fri, 31 Jul 1992 09:38

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Someone told me the other day that some (most?) PCs with an ISA bus
have the IRQ 9 signal connected to the pin on the bus slots that is
designated for IRQ 2. This is quite a logical thing to do as there is
no point in having IRQ 2 on the bus for AT class machines.
 
How common is this?
Can it be detected by software?

-- 
Henry Gessau          henryg@kullmar.se
-- 
Henry Gessau          henryg@kullmar.se

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Message-ID: <1992Jul31.093843.10058@kullmar.se>

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Newsgroups: comp.os.msdos.programmer
Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!ira.uka.de!math.fu-berlin.de!news.netmbx.de!Germany.EU.net!mcsun!sunic!seunet!kullmar!henryg
From: henryg@kullmar.se (Henry Gessau)
Subject: IRQ 9 instead of IRQ 2 on ISA bus
Message-ID: <1992Jul31.093843.10058@kullmar.se>
Summary: IRQ 9 mapped to IRQ 2 on ISA bus?
Keywords: IRQ ISA bus interrupt detection
Organization: Firma Bo Kullmar Datakonsult
Date: Fri, 31 Jul 1992 09:38:43 GMT
Lines: 15