EGA info wanted

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#1325

From: Jeff Capehart
Date: Thu, 22 Feb 1990 05:32

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I am trying to find out some technical info on the EGA mode.  Specifically
I want to know how to store a picture into the video memory so that it 
looks the way it should.  I will be reading a 64k file that is 320x200
with 16 colors (4 bits of 8 used).

I know the video memory starts at A0000 and is probably in banks of 8k.
Each bank of 8k corresponds to one of 4 bits for 16 color mode.  The
banks are called bitplanes and all of them start at A0000.  So,
how do I switch from one bitplane to the next?  Doing EGA stuff in
BIOS would be pathetically slow.  All I really want to do is screenload
a picture so direct memory copy seems like the fastest way to do it.
--
Jeff Capehart 		Internet: jdc@beach.cis.ufl.edu
University of Florida	UUCP:   ..!uflorida!beach.cis.ufl.edu!jdc

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!uakari.primate.wisc.edu!uflorida!beach.cis.ufl.edu!jdc
From: jdc@beach.cis.ufl.edu (Jeff Capehart)
Newsgroups: comp.sys.ibm.pc.programmer,comp.sys.ibm.pc
Subject: EGA info wanted
Summary: need tech info
Message-ID: <22390@uflorida.cis.ufl.EDU>
Date: 22 Feb 90 05:32:23 GMT
Sender: news@uflorida.cis.ufl.EDU
Reply-To: jdc@beach.cis.ufl.edu (Jeff Capehart)
Organization: UF CIS Department
Lines: 14