Control Unit: The control unit performs the most important function in a computer.The sequence of the instructions is controlled by the control unit. The control unit guides ALU which of the operations are to be performed. ALU: This unit is used for performing arithmetic operations such as Logical Unit Addition, Subtraction, Multiplications, division, and other logical (ALU) operations on the data.This usually consists of chips of both ROMs (Read Only Memories) and RAMs (Random Access Memories) either bipolar or MOS. Computer programs and data are stored in the Memory Unit.
The memory of a computer is used for storing two distinct types of information such as data to be processed by the computer and program through which the result of the desired problem is obtained.
Memory Unit: The memory unit of a digital computer consists of devices that are capable of storing information. The typical devices which are used for this purpose are keyboards, paper tape reader and toggle switches, etc. The program from the memory is read into the machine along with the input data which are required to solve or compute the problem by the machine. The basic purpose of this unit is to read the data into the machine. Input Unit: Through this unit data and instructions are fed to the memory of the computer. Basically, there are five building blocks of a digital computer system namely: In a computer system, ALU and Control Unit are combined in one unit called Central Processing Unit (CPU). Therefore a microprocessor interfaced with memory, and Input/ Output devices form a Microcomputer. performs certain arithmetic and logical operations, accept data from an input device and send results to output devices. The microprocessor is a digital device on a chip that can fetch instructions from a memory, decode and execute them i.e. The main operation 8085 Microprocessor ALU is arithmetic as well as logical which includes addition, subtraction, increment, decrement, logical operations like AND, OR, Ex-OR, complement, evaluation, left shift or right shift and having a very good register design to do these operations. The 8085 Microprocessor was designed by Intel in 1977 using NMOS technology. The 8085 Microprocessor is a first and perfect design microprocessor among all who was having all the operation features to use on a computer. 
When the microprocessor came to the real market, then the 8085 Microprocessor was the first microprocessor over healed the Embedded design product. Nowadays, the microprocessor can be seen in almost all types of electronic devices like mobile phones, printers, washing machines, etc. Any microprocessor-based systems having a limited number of resources are called microcomputers. A microprocessor is a multipurpose, programmable, clock-driven, register-based digital electronic Integrated Chip/device which reads the binary instructions from a storage device called memory, accepts the binary data as inputs, and processes the data according to the instructions, then provides the result as output.
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