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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _setvideomode function selects a screen mode appropriate for
     a particular hardware/display configuration. The <mode> argument
     can be one of the manifest constants listed in any of the
     following tables:
     See: ◄Constants for Screen Mode►
          ◄VESA Constants for Screen Mode►
          ◄_MAXRESMODE and _MAXCOLORMODE Constants for Screen Mode►
 
     See also: ◄Hercules Support►
 
     Return Value
 
     The function returns the number of text rows if the function is
     successful. If an error is encountered (that is, the mode selected
     is not supported by the current hardware configuration), the
     function returns 0.
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