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int pascal VidScroll(int x1, int y1, int x2, int y2, int n, WORD attr)

  This function scrolls an area of the screen upwards or downwards.

Parameters
  x1, y1, x2, and y2 are the 0-based coordinates of the area to scroll.
  n is the number of lines to scroll. If n is greater than 0, then the
   screen will be scrolled upwards. If n is less than 0, the screen will
   be scrolled downwards.
  attr is the color attribute which the scrolled area will be filled with.

Returns
  Nothing.