Gotoxy PROC

   Locates the cursor at a given row and column in the screen's console buffer.
   The values passed in DH and DL can range from 0 to X-1 and from 0 to Y-1, where X is the number of columns and Y is the number of rows in the console buffer.
   The default window size is 80 x 25 but it can be set to a different size.
   Use the GetMaxXY procedure to obtain the size of the screen's console buffer.
   If the console buffer is set larger than the display window, the window repositions itself automatically to display the cursor position.

Call args:  DL = column
            DH = row

Return arg: None

Example: Locate the cursor in the lower right
         corner of an 80 x 25 screen.

      mov  dl,79  ;column
      mov  dh,24  ;row
      call Gotoxy