Date: Fri, 2 Jun 1995 19:52:36 -0400
From: dj (DJ Delorie)
To: jimh AT minerva DOT cis DOT yale DOT edu
Cc: eliz AT is DOT elta DOT co DOT il, djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Re: Graphics


> 	Am I correct to then assume that I can not fill a screen using an 
> assembly routine that directly stores data in it (rather than calling 
> some other routine for each pixel/line/etc?  That would probably be too 
> slow for what I am doing.  I am about to start looking through the 
> source of the graphics library to better understand what is up, but would 
> feel alot better if someone would clarify this for me before I end up 
> wasting lots of time to find out djgpp won't do what I need.

You need to call GrSetMode() to initialize the extender.  Once this is
done, the paging hardware is active for that memory, and *then* you
can just poke values in.  The support is in hardware, not software, so
it doesn't affect your programming, but it does require
initialization.