Do I have a chance to get into a great cs grad school? I am an undergrad from India from a good university( not IIT,NIT).
Our GPA is calculated on a different percentage scale and mine is 73-75%
which is a very good score according to our system.
My GRE score=1600.
I have an internship at a major company.
I am thinking of writing a research paper but have no research experience. 
Do I have a chance at the top colleges like UC Berkeley,or Michigan or even Carnegie Mellon?
Top PhD programs in Computer Science are very selective. Just having good or even excellent grades is not enough. At least, you need to have very strong recommendation letters and preferably some undergraduate research experience. I would suggest applying not only to top schools but also to second tier schools.