Re: looking for information on programming parallel ports

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#146

From: Snyder
Date: Sun, 12 Apr 1992 02:42

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In article <1992Apr03.124319.652@vort.uucp> mike@vort.uucp (Mike Nemeth) writes:
>is it possible to program the parallel port(s) in such a way that an interrupt
>is generated when a character is output? can the parallel port also be used
>as an input device, and if so, is an interrupt generated when a character
>arrives?
>
>any book recommendations/reviews that deal extensively with serial/parallel
>i/o are welcome. thanx in advance...
>
>-- 
>The Barbi Twins (TM) are the GNU Emacs of women.
>
>Mike Nemeth           VORT Computing          mike@vort.cuc.ab.ca

The only way that a character is ouput to either serial or parallel port
is by a software interrupt routine.  When data arrives arrives at either
port, an irq is generated, forcing an int.  The irq depends on your system,
but the software routine is usually in one place.  I don't have the book 
in front of me, so I'll get back to you on the specifics.  In the worst case,
I am totally wrong, and you will have to poll the parallel port for input.

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This note prepared by Lowell "I'm never obnoxious" Snyder.
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From: lsnyder@olive.ucsb.edu (Snyder)
Newsgroups: alt.msdos.programmer,comp.os.msdos.programmer,comp.msdos.programmer
Subject: Re: looking for information on programming parallel ports
Summary: We have the technology
Message-ID: <4131@ucsbcsl.ucsb.edu>
Date: 12 Apr 92 02:42:24 GMT
References: <1992Apr03.124319.652@vort.uucp>
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