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From: Steven_N_Jones@cup.portal.com
Newsgroups: comp.sys.ibm.pc
Subject: Re: screen base address
Message-ID: <1045@cup.portal.com>
Date: Mon, 19-Oct-87 19:47:35 EDT
Article-I.D.: cup.1045
Posted: Mon Oct 19 19:47:35 1987
Date-Received: Wed, 21-Oct-87 06:29:15 EDT
References: <965@cup.portal.com> <2827@bnrmtv.UUCP>
Organization: The Portal System (TM)
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    Glenn Connery writes that the Compaq dual mode monitor cards switch
between base offsets when changing modes from monochrome to color.  I have
a Compaq plus which I bought in 1984, and its display card uses a single
base address for both modes.  I wrote a short test program which wrote
to offset b000:0 and nothing appeared on the screen in either mode.  When
I changed the address to b800:0, the text appeared in either the monochrome
or the color mode.

    steven.n.jones@cup.portal.com