To: THE MASKED PROGRAMMER <badcoe AT bsa DOT bris DOT ac DOT uk>
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Re: One More Confused Interrupt Question 
Date: Mon, 27 Feb 95 19:11:08 +0200
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>

> 	I want, ultimately, to reprogram the dos clock-tick to a suitable
> rate to use for synchronising my VGA redraws with the retrace.  (Note, this
> might not be a good thing to do, I might end up using some other timer ?
> But ... )
>
>	To do this I have to master interrupts, so some (naive) questions:
>
> (i) What is the difference between a Real Mode interrupt and a Protected Mode
>     interrupt.

Did you read Chapter 18 of the DJGPP FAQ list?  It explains the
above in some detail.  You can get the latest version of the FAQ
list as faqNNN.zip from the same place you've got DJGPP.