Date: Fri, 5 May 1995 11:46:50 +0300
From: eliz AT is DOT elta DOT co DOT il (Eli Zaretskii)
To: hatfield AT vega DOT lpl DOT arizona DOT edu
Subject: Re: Port IO & interrupts
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu

> I just brought djgpp over to my machine. So far I am quite pleased,
> bu I have a couple of questions regarding low level PC/MSDOS stuff.
> 1.      How do I install interrupt vectors . (like MSC getvect() ..)?      
> 2.      Can COM & LPT ports be treated like FILE* (fprintf(COM1,...))?
 
Get and unzip the file faqNNN.zip from the same place you got DJGPP, and
read Chapter 18 there.  As a newcomer to DJGPP, you might as well read it
in its entirety.