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_set_screen_lines
=================

Syntax
------

     #include <conio.h>
     void _set_screen_lines(int nlines);

Description
-----------

This function sets the text screen width to 80 and its height to the
value given by NLINES, which can be one of the following: 25, 28, 35,
40, 43 or 50.  On a CGA, only 25-line screen is supported.  On an EGA,
you can use 25, 35 and 43.  VGA, PGA and MCGA support all of the
possible dimensions.  The number of columns (i.e., screen width) is 80
for all of the above resolutions, because the standard EGA/VGA has no
way of changing it.  After this function returns, calls to
`gettextinfo()' will return the actual screen dimensions as set by
`_set_screen_lines()'.  That is, you can e.g. test whether
`_set_screen_lines()' succeeded by checking the screen height returned
by `gettextinfo()' against the desired height.  This function has a
side effect of erasing the screen contents, so application programs
which use it should make their own arrangements to redisplay it.