Registers:                                                                                   

Small temporary storage or internal memory units control command under process .The small memory units are called register

Machine  Cycle:                                

      Fetching  è       Process of obtaining instruction.

      Decoding è    The process of decoding the instruction or data from memory.

      Executingè    The process of caring out results .

      Storage   è     Writing the  results in the RAM.

 

CPU clock:                                                                                                                                       

To control all the computer operations (26 Hz e.g. )

 

ii) I/O Devices

Input devices and output devices.

Input devices

 

Keyboard:                                                                    

Keyboard having many keys and it is important part of input devices to give command to computer.

• i)The Alphanumeric keys     i.e       +,-, Esc, Tab, Caps lock ,
• ii)   Special keys                      i.e          Alt, Ctrl, etc
• iii) Numerical Keys                 i.e            0 to 9 all numerical keys
• iv) Function Keys                    i.e           F1 to F12
• v) Cursor Movement Keys     i.e           à ß  etc