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Article #2372Re: COM1 COM2 interrupt numbers?
From: Johnny J. Chin
Date: Fri, 14 Sep 1990 09:59
Date: Fri, 14 Sep 1990 09:59
33 lines
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1628 bytes
First of all ... the hardware interrupt for the serial ports are 3 or 4, by
default.
COM1 - IRQ4 (hardware interrupt request #4)
COM2 - IRQ3
As for some other common ones:
INT 0 - NMI (non-maskable interrupt) - usually due to memory parity error
INT 1 - reserved
INT 2 - used by many EGA/VGA cards (usually available on 8088)
cascading interrupt on 286/386/486 machines
INT 3 - COM2:
INT 4 - COM1:
INT 5 - Hard Disk Controller on 8088 (available for LPT2: on 286/386/486)
INT 6 - Floppy Controller
INT 7 - LPT1:
INT 14 - cascaded off INT 2 - Hard Disk Controller on 286/386/486.
I hope this information helps ...
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Computer Dr.
Disclaimer: The views expressed herein are STRICTLY my own, and not CMU's.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!know!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!uflorida!mephisto!udel!rochester!pt.cs.cmu.edu!o.gp.cs.cmu.edu!andrew.cmu.edu!jc58+ From: jc58+@andrew.cmu.edu (Johnny J. Chin) Newsgroups: comp.os.msdos.programmer Subject: Re: COM1 COM2 interrupt numbers? Message-ID: <Iaw_cB600VY6IMyqUW@andrew.cmu.edu> Date: 14 Sep 90 09:59:41 GMT Organization: Carnegie Mellon, Pittsburgh, PA Lines: 33