Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!rutgers!rochester!pt.cs.cmu.edu!b.gp.cs.cmu.edu!Ralf.Brown@B.GP.CS.CMU.EDU
From: Ralf.Brown@B.GP.CS.CMU.EDU
Newsgroups: comp.os.msdos.programmer
Subject: Re: COM1 COM2 interrupt numbers?
Message-ID: <26f20945@ralf>
Date: 15 Sep 90 10:58:13 GMT
Sender: ralf@b.gp.cs.cmu.edu
Organization: Carnegie Mellon University School of Computer Science
Lines: 19
In-Reply-To: <90257.214305PA163514@tecmtyvm.mty.itesm.mx>

In article <90257.214305PA163514@tecmtyvm.mty.itesm.mx>, PA163514@tecmtyvm.mty.itesm.mx wrote:
}Int    Purpose
}1C       Com1
}1B	  Com2
}
}This is for PC-XT
}
}I'm sure about int 1C, because, I work with com-interrupts.
}I'm not sure, but I think com-interrupt in AT are inverse. That is,
}com1 1B and Com2 1C, but look that:

First of all, that's INT 0C/0B, not 1C/1B (which are timer tick and ^Break).
Secondly, both PC and AT use INT 0C for COM1 and INT 0B for COM2 (as do IBM-
compatible 386s).
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