07 PDP one and eight etc. And third one is the third generation 91 use integrated circuits but not microprocessor. Example IBM system and a four generation 1971 present used microprocessor in the example PDP three and PDP 134 Apple and the fifth generation current artificial intelligence and quantum computing and the first generation would now call main frames took up the entire room despite the fact they were thousand times lower than today's PCs. The second and the third generation were made up of both main frames and many computers