Path: utzoo!attcan!uunet!seismo!esosun!ucsdhub!ucrmath!hope!jantypas
From: jantypas@hope.UUCP (John Antypas)
Newsgroups: comp.unix.microport
Subject: Physical memory and Microport Drivers
Message-ID: <304@ucrmath.UUCP>
Date: 14 Jun 88 14:14:01 GMT
Sender: news@ucrmath.UUCP
Reply-To: jantypas@hope.UUCP (John Antypas)
Organization: University of California, Riverside
Lines: 21

I've got 99% of a hercules graphics driver done and now I'm trying to 
force Sys V/AT to allow me to write to console memory without causing a 
system panic.  The preferred way to do this is:

char	*c

c = gstokv(VIDEOSEL);

which would return a kernel virtual address pointing to video memory. (See
gst.s) and this is the console driver does it, but it doesn't work.  As soon
as I try anything at all, such as:

*c = 0xff

which should put 8 dots on the upper left of the screen,  the system dies.
Any guesses?

John Antypas -- Soft21 --21st Century Software:

UUCP: {buita|garp|killer|pyramid|reed|sdeggo|ucsd!ucrmath|uport}!soft21!jantypas
Internet: jantypas%soft21.uucp@{garp.MIT.EDU, ucsd.EDU} BITNET: jantypas@ucrvms