A MAINFRAME ARE COMPUTERS THAT IS COMMONLY USED BY MANY LARGE ORGANIZATIONS FOR CRITICAL APPLICATIONS. HAVE THE ABILITY TO RUN MULTIPLE OPERATING SYSYTEMS. SINCE THE MID 1960'2 THE MAINFRAME DESIGN HAVE INCLUDED SEVERAL SUBSIDIARY COMPUTERS
A PC IS BASICALLY A PERSONAL COMPUTER THAT CAN BE A LAPTOP, DESKTOP OR JUST A TABLET COMPUTER. EARLY 1970'S HAD THE OPPURTUNITY FOR THE OF A COMPUTER SYSTEM. ONE BILLION COMPUTERS WERE SOLD WORLDWIDE SINCE MID 1970'S TIL THIS TIME.
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