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Article #1459

Re: VGA 640x400x256 possible!

#1459
From: orlov
Date: Sat, 12 Sep 1992 20:10
31 lines
1756 bytes
In article <"92-09-01-18:08:55.86*UKB8"@DKAUNI2.BITNET>, UKB8@DKAUNI2.BITNET
writes:
> 
> Hi everybody!
> 
> I'm looking for a way to trick a *standard* VGA-card into a graphic reso-
> lution of 640x400x256.
> As a standard VGA has at least 256K memory and 640x400 pixels at 8 bit
> color resolution use 256000 bytes, this should be possible (using 4 bit
> planes as in normal EGA/VGA-modes); as far as I heard by now, the VGA's
> clocking scheme doesn't allow it, but I hope you prove that wrong and
> come up with an ingenious solution!  :-)
> Please answer by mail, if it works, I'll summarize.
> 
> TNXIA,
>       Kai

Hi Kai!

I managed to force my VGA (in fact, Paradise VGA) to enter 640x400x256 mode.
Its number is 5Eh! Just invoke INT 10h with AX=005Eh and you'll have your VGA
working in 640x400x256. I was told this must work on ANY VGA !

BTW: I couldn't access the lower half of screen! Only first 128K can be
accessed (seg=A000..BFFF). Do you (or someone else who reads this) know
how to access another 128K ?

			With best regards,		D.S.
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		"I'm from the land of Russia where Shadows lie!"	
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Message-ID: <1992Sep12.113051.1@mars.ibioc.serpukhov.su>
Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!fuug!kiae!uranus!mars.ibioc.serpukhov.su!orlov
References: <"92-09-01-18: 08:55.86*UKB8"@DKAUNI2.BITNET>

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Newsgroups: comp.os.msdos.programmer
Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!fuug!kiae!uranus!mars.ibioc.serpukhov.su!orlov
From: orlov@mars.ibioc.serpukhov.su
Subject: Re: VGA 640x400x256 possible!
Message-ID: <1992Sep12.113051.1@mars.ibioc.serpukhov.su>
Lines: 31
Sender: news@uranus.ibioc.serpukhov.su (USENET News System)
Organization: Institute of Cell Biophysics
References: <"92-09-01-18: 08:55.86*UKB8"@DKAUNI2.BITNET>
Date: Sat, 12 Sep 1992 20:10:51 GMT