Using mono screen with EGA installed

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1 total messages Started by Ulli Nollert Wed, 22 Oct 1986 16:16

#8453

Author: Ulli Nollert
Date: Wed, 22 Oct 1986 16:16

24 lines
1540 bytes

. 

I have run across a problem accessing the monochrome screen if the EGA 
is also installed and I wonder if anyone has had a similar problem and 
found a solution.   The application I am writing (in IBM Pascal) uses 
IBM's Graphics Development Toolkit to draw graphics and some text to 
the EGA screen.  The problem is that I would also like to write some 
text to the monochrome screen and as far as I can tell this is not 
possible.  There is no device driver available for the mono card so 
Toolkit calls can not be used.  The EGA intercepts all calls to DOS and 
tries to write them to the EGA display.  It is not possible to write 
directly to the appropriate memory locations since the EGA driver uses 
some of this space to define how characters are drawn.

Thanks in advance!!


Ulli Nollert
School of Chemical Engineering
301 Olin Hall
Cornell University
Ithaca NY 14853

ph. (607) 255-8268

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