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AH = 04h
Return:
AH = light pen trigger flag 00h not down/triggered 01h down/triggered DH,DL = row,column of character light pen is on CH = pixel row (graphics modes 04h-06h) CX = pixel row (graphics modes with >200 rows) BX = pixel column
Desc: Determine the current position and status of the light pen (if present)
Notes: On a CGA, returned column numbers are always multiples of 2 (320- column modes) or 4 (640-column modes). Returned row numbers are only accurate to two lines
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