How do you synchronize screen mapped RAM updates on old CGA cards?

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#4598

From: L. Scott Emmons
Date: Fri, 08 Feb 1991 20:32

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I am working on a program that will run on an old 4.77 pc with one of the
wonderful old CGA cards with flicker on direct screen-mapped RAM updates.
How do you synchronize these updates to alleviate this problem?  Do you just
check a port and write on a certain value?  Any help is much appreciated...

Thanks,
-scott
			L. Scott Emmons
			---------------
	emmons@csus.csus.edu  <or>  ...[ucbvax]!ucdavis!csus!emmons
		Packet: kc6nfp@kg6xx.#nocal.ca.usa.na

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From: emmonsl@athena.ecs.csus.edu (L. Scott Emmons)
Newsgroups: comp.os.msdos.programmer
Subject: How do you synchronize screen mapped RAM updates on old CGA cards?
Message-ID: <1991Feb8.203215.23325@csusac.csus.edu>
Date: 8 Feb 91 20:32:15 GMT
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