1. Writing directly in the video memory....
- Posted by Pierre Beaulieu <pbeaulie at VIDEOTRON.CA>
Apr 05, 1999
-
Last edited Apr 06, 1999
--Boundary_(ID_jhIaimZNupIEGsFkpVkMnw)
Content-type: text/plain; charset=iso-8859-1
Content-transfer-encoding: quoted-printable
Hi,
Long time ago, when I was at the University, to write directly in video =
memory, it was necessary to use a base address and an offset. Is it =
still the same with the 32 bits addressing. Based on my understanding, =
it is not necessary to use an offset anymore. So how do you access the =
video memory in the 32 bits addressing "mode".
Thank you,
Pierre Beaulieu
--Boundary_(ID_jhIaimZNupIEGsFkpVkMnw)
Content-type: text/html; charset=iso-8859-1
Content-transfer-encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
<HTML>
<HEAD>
<META content=3Dtext/html;charset=3Diso-8859-1 =
http-equiv=3DContent-Type>
<META content=3D'"MSHTML 4.72.3612.1700"' name=3DGENERATOR>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT color=3D#000000 size=3D2>Hi,</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Long time ago, when I was at the =
University, to=20
write directly in video memory, it was necessary to use a base address =
and an=20
offset. Is it still the same with the 32 bits addressing. Based on my=20
understanding, it is not necessary to use an offset anymore. So how do =
you=20
access the video memory in the 32 bits addressing =
"mode".</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Thank you,</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Pierre =
--Boundary_(ID_jhIaimZNupIEGsFkpVkMnw)--
2. Re: Writing directly in the video memory....
- Posted by Aen Aen <Fist1000 at AOL.COM>
Apr 05, 1999
-
Last edited Apr 06, 1999
I believe the calculation is:
FLAT_ADDRESS = (SEGMENT * 16) + OFFSET
So, for example, mode 19's video memory address becomes:
#A000:#0000 = (#A000 * 16) + #0000 = #A0000
- aen
3. Re: Writing directly in the video memory....
- Posted by Lucius Hilley III <lhilley at CDC.NET>
Apr 05, 1999
-
Last edited Apr 06, 1999
On Mon, 5 Apr 1999 20:39:27 -0400, Pierre Beaulieu <pbeaulie at VIDEOTRON.CA>
wrote:
>Hi,
>
>Long time ago, when I was at the University, to write directly in video
memory, it was necessary to use a base address and an offset. Is it still
the same with the 32 bits addressing. Based on my understanding, it is not
necessary to use an offset anymore. So how do you access the video memory
in the 32 bits addressing "mode".
>
>Thank you,
>
>Pierre Beaulieu
>
You can calculate 32 bit addresses using the base address, offset pair.
There have been some messages to this nature recently. Very recent infact.
the listserv is at
T=1
That will give you the month of March. I believe it was mentioned within
that time frame. You might want to organize by Subject rather than Date
though.
Lucius L. Hilley III
ICQ: 9638898
AIM: LLH III
http://www.cdc.net/~lhilley
Catch me if you can. HaHaHa.
