What are the functions of RIM, SIM, IN?
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Answer Posted / ramdas gore
IN istruction is used to read data from a port and store it
into accumulator.
IN PORT_ADDR
e.g. if a PPI say 8155 is configured to act port A as in
put and port address is 81h assumed, then to read port A as
IN 81H
MOV D, A ;MOVE THE READ DATA IN REG D
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