9 Class Computer Notes Introduction to Computers. IX Class Students need fresh and unique notes to pass the computer subject. It is a very important subject and can put a heavy impact over the percentage of the student. If you are 9 class student, you take make preparation using these notes free of cost. In this chapter, various generation of computers were discussed. Types of hardware and software, types of computers, analog and digital computers, super computers, micro computers, mini computers, machine language, assembly language, high level language, translation of source code into machine code, advantages and drawbacks of internet, functions of compiler, difference between compiler and interpreter are the main topics of discussion in this chapter of Introduction to Computers.