Explanation of Block Diagram of Computer|Computer Notes

  • These are also peripheral devices that transfer data from main memory to user.
  • Output unit receives data from main memory in binary form and converts it into user readable form.
  • Some common output devices are Monitors
  1. Printers Plotters Speaker
  2. Fax Machine (etc).


  • Buses are wires, which used to carry data from one location to other inside the processor.
  • Three main buses are Data Bus & Address Bus Control Bus

Data Bus:

  • It is 8-bit bus.
  • It is Bi-Directional bus.
  • Data sent from Processor to Memory (Write operation) or from Memory to Processor” (Read operation).

Address Bus:

  • It is 16-bit bus.
  • It is Uni-Directional bus.
  • It carries 16-bit address code from “Processor to Memory”, which is accessing for a Read or Write operation.

Control Bus:

  • It is grouping of timing and control signals of processor.
  • Some control lines are output from Processor and some are input to the processor.


  • Ports are combination of wires through which data travels.
  • Two types of ports are Parallel Port & Serial Port

Parallel Port:

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