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From: forumexp@rpitsmts.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: Direct video access
Message-ID: <7871.1678.forumexp@mts.rpi.edu>
Date: Wed, 16-Sep-87 13:18:00 EDT
Article-I.D.: mts.7871.1678.forumexp
Posted: Wed Sep 16 13:18:00 1987
Date-Received: Sat, 19-Sep-87 02:11:41 EDT
Lines: 10


   I know you can get the current MODEM and video PAGE from
   INT 0x10. These numbers are also stored in low (0:400) memory.
   Are the values in low memory always (100%) accurate?

   Also, I've come up with some direct video read/write routines.
   I seem to get trouble when I use pointers (*vidp = buf[i], etc.
   where vidp is a far pointer pointing to the current video page)
   but if I use PEEKs and POKEs I have no problems. Is there
   a problem with using far pointers (vidp = ((unsigned char *) 0xB800)