Central Processing Unit of a Computer
Puzzle 1 of Elvis Presley Easy Pack
Question is: Central Processing Unit of a Computer
and the answer is: MAINFRAME
Word Meaning:
MAINFRAME — (computer hardware) A large, powerful computer able to manage very many simultaneous tasks and communicate with very many connected terminals; used by large, complex organizations (such as banks and supermarkets) where continuously sustained operation is vital.
Definitions from Wiktionary.