Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!cornell!uw-beaver!fluke!mason
From: mason@tc.fluke.COM (Nick Mason)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Com3 and Com4
Message-ID: <6045@fluke.COM>
Date: 18 Nov 88 16:40:39 GMT
References: <2677@silver.bacs.indiana.edu>
Sender: news@tc.fluke.COM
Organization: John Fluke Mfg. Co., Inc., Everett, WA
Lines: 43

In article <2677@silver.bacs.indiana.edu> millerp@silver.bacs.indiana.edu (Lost My Mind) writes:
>
>Hi, I'm working on a terminal emulation program at work and I've
>run into a slight problem. One of the tech's here has an IBM Clone
>and they want to put their 'Internal Half-Card' Modem in as either
>Com3 or Com4 depending on ???? Anyway, I need to know what the interrupt
>vector address for these comports are, I can't find it in my manual 


The problem you face is the interrupt vectors for COM3 and COM4 are
not standard.  We have the same problem and had to restrict
the cards our software would run on.  For your reference:

IBM Dual Async card
COM3  int 3
COM4  int 3


HP Dual asyn card
COM3  INT 10
COM4  INT 11


but.. kermit 2.3 says
com3 int 3
com4 int 4


The above are the hardware interrupt levels.

Anyway, the bottom line is that the int level depends
on the card.


Nick Mason/ms272G/John Fluke Mfg Co/Box C9090/Everett WA 98206 USA
   mason@tc.fluke.COM
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