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==TENEX== {{Main|TENEX (operating system)}} TOPS-20 was based upon the [[TENEX (operating system)|TENEX]] operating system, which had been created by [[BBN Technologies|Bolt Beranek and Newman]] for Digital's [[PDP-10]] computer. After Digital started development of the KI-10 version of the PDP-10, an issue arose: by this point TENEX was the most popular customer-written PDP-10 operating systems, but it would not run on the new, faster KI-10s. To correct this problem, the DEC PDP-10 sales manager purchased the rights to TENEX from BBN and set up a project to port it to the new machine. In the end, very little of the original TENEX code remained, and Digital ultimately named the resulting operating system TOPS-20.
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