Need to know about a few CGA ports

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#3822

From: Jonathan Kimball
Date: Mon, 24 Sep 1990 20:21

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Could someone tell me what ports or registers on the CGA card are used to:
1. Determine if the card is in vertical(not horizontal) retrace.
2. Enable/Disable blinking.
3. Enable/Disable underscore.
 
Jonathan Kimball
II70038 at MAINE.BITNET

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!yale!venus!yalevm!maine!ii70038
From: II70038@MAINE.BITNET (Jonathan Kimball)
Newsgroups: comp.sys.ibm.pc.misc
Subject: Need to know about a few CGA ports
Message-ID: <90267.162100II70038@MAINE.BITNET>
Date: 24 Sep 90 20:21:00 GMT
Organization: University of Maine System
Lines: 7