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PEN - a device I/O function that reads the lightpen coordinates
 
Syntax
  PEN(n)
    ■ n, a numeric expression that has an integer value between 0 and 9,
      indicates what type of information you want returned by the function:
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0  whether pen was down since last    │ 4  last-known valid x-coordinate
   function call (-1 = yes, 0 = no)   │ 5  last-known valid y-coordinate
1  x-coordinate of last pen press     │ 6  character row of last pen press
2  y-coordinate of last pen press     │ 7  character column of last pen press
3  current pen switch status          │ 8  character row of last pen position
   (-1 = down, 0 = up)                │ 9  character column of last position
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See Also  ◄PEN statement►