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From: mh2o+@andrew.cmu.edu (Michael Lorenz Holling)
Newsgroups: comp.os.msdos.programmer
Subject: AT PIC, interrupts different?
Message-ID: <4cNX5sO00VpOQ4c0M1@andrew.cmu.edu>
Date: 24 Jun 91 17:52:56 GMT
Organization: Class of '92, Carnegie Mellon, Pittsburgh, PA
Lines: 10

I'm having a problem after moving hardware from an XT to an AT.  The hardware
in question is a MIDI card which is supposed to generate interrupts for a
variety of reasons.  It worked fine on the XT, however on the AT only one
interrupt occurs.  I'm guessing it's a problem manipulating the PIC.  On the
XT I would write 0x20 to port 0x20 to reset the interrupt.  Is there something
different I need to do on the AT?  I'm using IRQ 2, is there any hardware which
might be using this line?

Thanks,
- Mike