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BBN LISP is a series of implementations, developed at BBN, of the LISP programming language. It was first written for a PDP-1 computer, largely inspired by L. Peter Deutsch's Basic PDP-1 LISP. This version was a timeshared LISP without an underlying operating system, and implemented a software scheme for virtual memory.

The next iteration ran on the SDS 940 under the Berkeley Timesharing System which provided virtual memory. Next, BBN wanted to move their LISP to the then new PDP-10 computer. Due to the lack of hardware support for virtual memory, BBN added a paging device of their own making and essentially ported the Berkeley system, resulting in TENEX.

When some BBN researchers moved to Xerox PARC, they brought BBN LISP with them and had it run on the Maxc. At that point it was renamed INTERLISP.

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