What really made the IBM PC different from previous IBM computers was that it was the first one built from off the shelf parts. The PDP-1's operating system was the first to allow multiple users to share the computer simultaneously. This was perfect for playing Spacewar. A year earlier, research engineer Robert Noyce had co-founded the Fairchild Semiconductor Corporation. From 1958 to 1959, both electrical engineers were working on an answer to the same dilemma. Production models (ERMA Mark II) of the ERMA computer were built by General ElectricERMA computers were used into the 1970s. Assembly language is always translated back into machine code by programs called assemblers. Two computers went to the navy and the last machine went to the United States Weather Bureau in early 1955. Sir Frederick Williams and Tom Kilburn co-invented the Williams-Kilburn Tube (or Williams Tube), a type of altered cathode-ray tube. In April 1946, a $300,000 deposit was given to Eckert and Mauchly for the research into a new computer called the UNIVAC.

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