I/O switch for MS-DOS?

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Article #6076

#6076

From: Tim Pozar
Date: Fri, 28 Mar 1986 15:17

21 lines
1499 bytes

	Back in the old days of CP/M-80, we had what was known as an
I/O byte.  This byte showed where we were directing the output to the 
printer, console, tape reader, tape sender, etc.  I assume that 
MS-DOS has somewhat the same thing when using the MODE programme to
change the PRN device to say a COM port.  What does MODE change?
How do I inquire DOS to find out where things are going?  I have
found the place where DOS has the port addresses for the par/ser
printer ports,  but haven't figured out where it keeps the info on
which one is the active on.
	Any takers?
 
                         Tim Pozar C.E.
                         KLOK-FM
                         (415) 788-3904
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Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site well.UUCP
Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!cbosgd!hplabs!well!pozar
From: pozar@well.UUCP (Tim Pozar)
Newsgroups: net.micro.pc
Subject: I/O switch for MS-DOS?
Message-ID: <852@well.UUCP>
Date: Fri, 28-Mar-86 10:17:40 EST
Article-I.D.: well.852
Posted: Fri Mar 28 10:17:40 1986
Date-Received: Sun, 30-Mar-86 03:13:28 EST
References: <1236@ecsvax.UUCP>
Reply-To: pozar@well.UUCP (Tim Pozar)
Distribution: net
Organization: Whole Earth Lectronic Link, Sausalito CA
Lines: 21
Keywords: I/O PRN MS-DOS MODE

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