Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!mcvax!kth!draken!tut!ra!chyde!ts
From: ts@chyde.uwasa.fi (Timo Salmi LASK)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Help , COM3 and COM4 ports.
Message-ID: <576@chyde.uwasa.fi>
Date: 13 Jun 89 15:20:45 GMT
References: <749@abvax.UUCP>
Reply-To: ts@chyde.uwasa.fi (Timo Salmi LASK)
Organization: U of Vaasa, Finland
Lines: 19

In article <749@abvax.UUCP> dav@abvax.UUCP (Dave A. Vasko) writes:
>
>We are planing on connecting four serial ports to an IBM AT compatible
>computer. Is there a standard I/O address location for COM3 and COM4. 
>If not is there a set of addresses that are commonly used. Also what
>interrupt levels are used with COM3 and COM4.

One roundabout way of finding out is looking at the setup menus of
telecommunication programs.  For example Telix (alt-O) or Procomm
Plus (alt-S).  In practice I have noticed, that what you have to use
depends on what you have in those ports.  For example I have a modem
in com3, and when I changed the modem, I had to change (strange as
its sounds) the com3 irq as well to keep com1 and com still
operative. 

...................................................................
Prof. Timo Salmi                                (Site 128.214.12.3)
School of Business Studies, University of Vaasa, SF-65101, Finland
Internet: ts@chyde.uwasa.fi Funet: vakk::salmi Bitnet: salmi@finfun