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- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
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- Via: UK.AC.LIV.MAIL; 27 JAN 93 12:11:03 GMT
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- Message-ID: <11006.9301271206@uxb.liv.ac.uk>
- Newsgroups: bit.listserv.win3-l
- Date: Wed, 27 Jan 1993 12:06:07 GMT
- Sender: Microsoft Windows Version 3 Forum <WIN3-L@UICVM.BITNET>
- From: "Mr. R. Coates" <roysan@UXB.LIVERPOOL.AC.UK>
- Subject: Re: Prog HELP!
- In-Reply-To: <no.id>; from "KE WALTON" at Jan 27, 93 10:24 am
- Lines: 36
-
- KE WALTON wrote:-
- >
- > The video memory in all modes upto vga, is just a chunk of up to 256K of
- > mem located imediatley above the 640K barrier, and can be directly written to.
-
- Ah yes... but on EGA and VGA the video buffer at A000 consists of four memory
- planes in parallel. If I could choose which one I am writing too I would solve
- the problem!
-
- According to Walton, any cpu read or write to/from the video buffer
- automatically results in the graphics controller registers being updated
- with the values written/read. So again, this ain't so quick!
-
- >
- > The book I use is :-
- >
- > The new Peter Norton Programmers Guide To the IBM PC & PS/2
-
- Likewise - a good book but Norton (deliberately?) left out specific video
- info since Waltons book came out around the same time and they are personal
- friends.
-
- My thanks for taking the time to try and help me out... all the real PC
- answers seem to be in the IBM tech ref series - but try and find them!
-
- Roy.
-
- -------------------------------------------------------------------------------
- Sometimes, I wish that I could be what I was when I wanted to be what I am now.
- -------------------------------------------------------------------------------
- Roy Coates
- Dept of Mech Eng. Phone: 051-794-4862
- Liverpool University Fax: 051-794-4848
- P.O. Box 147
- Liverpool L69 3BX E-Mail: roysan@uxb.liverpool.ac.uk
- -------------------------------------------------------------------------------
-