* Extract a particular information from a instruction
* Params:
* what = Type of data to decode from a instruction
("OpCode", "ExtOpCode","OpA" or "OpB")
* word = Data to decode. A word and his two next words
* Returns: Extracted data from a instruction
* Extract a particular information from a instruction * Params: * what = Type of data to decode from a instruction ("OpCode", "ExtOpCode","OpA" or "OpB") * word = Data to decode. A word and his two next words * Returns: Extracted data from a instruction