Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!uxc!uxc.cso.uiuc.edu!addamax!schmitz
From: schmitz@addamax.UUCP
Newsgroups: comp.os.minix
Subject: Re: (none)
Message-ID: <16200001@addamax>
Date: 19 Apr 89 14:21:00 GMT
References: <13389@louie.udel.EDU>
Lines: 13
Nf-ID: #R:louie.udel.EDU:13389:addamax:16200001:000:539
Nf-From: addamax.UUCP!schmitz    Apr 19 09:21:00 1989



	The 8259A's on the AT should be reprogrammed for use in
protected mode.  They can be set up so that a device interrupting on
IRQ0 is reported to the CPU as interrupt 32, a device interrupting on
IRQ1 is reported to the CPU as interrupt 33, etc.  
	It's a little tricky because the controllers are cascaded, and
you have to know some other parameters.  I have routines to initialize
the controllers this way, and to restore them back to the original
state.
	Mail if you want 'em.  I'll post if there's enough interest.

						--Michael--