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  Description:  Get Light Pen Position     [CGA] [PCjr] [EGA]
 
  Obtains the current status and position of the light pen.
 
  Input             Output
  ══════            ═══════════════════════════════════════════════════
  AH=04H            AH=00H if light pen not down/not triggered
                      =01H if light pen down/triggered
                    BX=pixel column (graphics x coordinate)
                    CH=pixel row (graphics y coordinate, modes 04H-06H)
                    CX=pixel row (graphics y coordinate, modes 0DH-10H)
                    DH=character row (text y coordinate)
                    DL=character column (text x coordinate)
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