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From: davidbo@tekecs.UUCP (David Boyle)
Newsgroups: net.micro.pc
Subject: PGC & Pointers in Large Model
Message-ID: <5712@tekecs.UUCP>
Date: Tue, 24-Sep-85 14:31:12 EDT
Article-I.D.: tekecs.5712
Posted: Tue Sep 24 14:31:12 1985
Date-Received: Fri, 27-Sep-85 03:00:52 EDT
Distribution: net
Organization: Tektronix, Wilsonville OR
Lines: 7

We have a PC/AT with the professional graphics controller, and Microsoft
3.0 C compiler.  I have been unable to access the PGC memory ports.
I have tried all the combinations (char far *, long variables) and
compiling with /AL library, but to no avail.  Any clues as to why I 
might not be accessing the correct memory locations (0xc6000 for the
output fifo buffer, 0xc6300 for the output write pointer) ?  Any help
would be greatly appreciated.