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     The setvideomoderows function selects a screen mode for a
     particular hardware/display combination. The symbolic constants for
     <mode> are given in the reference screen for setvideomode. The
     the <rows> argument specifies the number of text rows to be used
     in a text mode.
 
     If the constant $MAXTEXTROWS is specified for the <rows> argument,
     the function will choose the maximum number of rows available. In
     text modes, this is 50 on the VGA, 43 on EGA, and 25 on others. In
     graphics modes that support 30 or 60 rows, $MAXTEXTROWS specifies
     60 rows.
 
     Return Value
 
     This function returns the number of rows set. The function returns
     0 if an error occurred (e.g., if the mode is not supported).
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