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How many output ports are there in peripheral I/O ?
1. 256
2. 512
3. 264
4. 24

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Correct Answer - Option 1 : 256

The correct answer is 256.

  • The input/output ports are addressed using special instructions such as IN for input and OUT for output.
  • An 8-bit port address should be followed by the IN or OUT instruction mnemonic.
  • An 8-bit address is assigned to each I/O device to identify it.
  • There will be 2=256 input ports and 256 output ports are possible in an 8085-based microcomputer.
  • The port number usually followed from 0–255.
  • The device that receives data for processing is called an input device.
  • The keyboard is the most frequent input device.
  • Any hardware device that sends data from a computer to another device is referred to as an output device.
  • The monitor is the most frequent output device.​

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