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Article #14

ModeX 4-side by side screens in 320x200x256 mode?

#14
From: Ian Tweedie
Date: Wed, 28 Oct 1992 16:21
26 lines
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Ok, Now that I have sussed 256k bit-mapped memory organisation, I have
another problem.

1 want to set up the VGA's memory such that are four screens sitting
side by side

   +---------+---------+---------+---------+
   |         |         |         |         |
   |         |         |         |         |
   |         |         |         |         |
   +---------+---------+---------+---------+

But according to my sources the register to do the trick is the CRTC
(03d4h) index 13h. This is however, an 8-bit register. The number I
wanna bung in is (no_scanlines)/2 = (320*4)/2 = 640. So how?
                     Screen_width ----^  ^----Screen Numbers

I am using 256k bit-mapped memory mode (modeX) in 320*200*256.

Thanks in advance.

And SHEM!! I have lost your E-mail when our accounts got changed. Keep
in touch, man! I haven't forgotten you!


IAN.
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Message-ID: <27404@castle.ed.ac.uk>
Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!uknet!edcastle!iantw

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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!uknet!edcastle!iantw
From: iantw@castle.ed.ac.uk (Ian Tweedie)
Newsgroups: rec.games.programmer
Subject: ModeX 4-side by side screens in 320x200x256 mode?
Message-ID: <27404@castle.ed.ac.uk>
Date: 28 Oct 92 16:21:52 GMT
Distribution: rec
Organization: Edinburgh University
Lines: 26