marc@ur-univax.UUCP (04/12/85)
I have some questions about the IBM Enhanced Graphics Adapter for which I hope
someone might be able to provide some insight. I have been using mode e (hex)
which is the 16 color 640 x 200 graphics mode.
The BIOS routines support the writing of a single character or a string to the
screen with specification of character attributes. It appears that only a
foreground character can be specified. If I specify a character attribute for
a foreground and background color, it seems to ignore the background color
info. The BIOS routines seem to work O.K. in text mode. The hardware is
capable of dealing with foreground and background so I don't understand why
the BIOS routines don't seem to support background.
I am using the EGA with the regular IBM color monitor (hence my interest in
the 640 x 200 mode). When I display characters in graphics mode they are very
poorly formed and blurry yet they are very sharp in text mode. Since I am
using the same ROM character set (8 x 8 double dot), the same character
generator, the same EGA, monitor, etc. why the difference in sharpness between
graphics and text modes ???
Mark J. Dumic
University of Rochester
...{allegra|decvax|seismo}!rochester!ur-univax!marc