Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!waikato.ac.nz!comp.vuw.ac.nz!canterbury!otago.ac.nz!andrew
Newsgroups: comp.os.msdos.programmer
Subject: Re: Accessing full VGA colour/Grey scale in C pre
Message-ID: <1991Jun7.180739.495@otago.ac.nz>
From: andrew@otago.ac.nz
Date: 7 Jun 91 18:07:39 NZDT
References: <1017@macuni.mqcc.mq.oz> <1991Jun6.083037.21366@kessner.denver.co.us>
Organization: University of Otago, Dunedin, New Zealand
Lines: 22

> 
> I reccomend the book:
> 
> 	Programmers Guide to PC and PS/2 Video Systems
> 	published by Microsoft Press.
> 

I also recommend this book but, I am awair of two errors in the book (or at
least they didn't work when I tried them).

1) It does not tell you how to program the palette registers on the DAC.  This
was a problem for me because the code I was writing was for XENIX and I was
told not to use the BIOS for anything I did.  I still don't know how to do
this.

2) The register number for the overscan in the book I had claimed to be
register 0x11.  The code only worked when I used register 0x31 (undocumented in
this book) as the overscan.  The symptoms were bizzar too.  Again if anyone
knows why 0x31 is correct please let me know.

Andrew.