Ad campaign for?

Cracked by everyone.

IBM computers - specifically the IBM 604 electronic calculator.

Aparna, Logik, Raghuvansh, Vinay Hegde, varuns88, dineshk, Rogi, Dibyo, sandman, Sumanth Patlolla, raklodramA, Rahulk, Nanda, Thejas V R, krudebox, udupendra, Smitha R Maiya, lanu, Shwetha Maiya, Bharath, Vishnu, Manish Achuth, joe, Anubhav, Qbrain, shrik and Ananth