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Input/Output :

Input/Output instructions are used to transfer data between input/output devices and memory/CPU register.

Commonly available I/O operations are:

  Operation Name  
            Description
  Input (Read) Transfer data from specified I/O port or device to destination
(e.g., main memory or processor register)
  Output (Write) Transfer data from specified source to I/O port or device.
  Start I/O Transfer instructions to I/O processor to initiate I/O operation.
  Test I/O Transfer status information from I/O system to specified destination
 
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