Path: utzoo!attcan!uunet!pyrdc!pyrnj!rutgers!sunybcs!benz
From: benz@cs.Buffalo.EDU (David Benz)
Newsgroups: comp.sys.zenith.z100
Subject: Second plane video memory
Message-ID: <2692@cs.Buffalo.EDU>
Date: 16 Nov 88 18:30:50 GMT
Sender: nobody@cs.Buffalo.EDU
Reply-To: benz@cs.Buffalo.EDU (David Benz)
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Organization: SUNY/Buffalo Computer Science
Lines: 18



How do I get at and manipulate the second plane of video memory?
I know one must change the value in one of the registers of the
CRT-C, port 0xDC, to display the second plane.  To read/write
to it one must change the value of the CPU Address latch, port 0xDA.

If there are any other interesting things that can be done by
manipulating these registers please tell.  Such as can you
reprogram the cursor, do simultaneous writes so as to get identical
planes of video memory, can you do horizontal (left - right)
scrolling, etc....


Dave Benz				SUNY at Buffalo  CS Dept.
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