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CAL, short for Conversational Algebraic Language, was a programming language and system designed and developed by Butler Lampson at Berkeley in 1967 for the SDS 940 mainframe computer. CAL is a version of the seminal JOSS language with a number of cleanups and new features to take advantage of the SDS platform.
The Berkeley SDS was used for the development of the Tymshare commercial time-sharing platform and an improved version of CAL was offered as a programming environment to its customers in 1969. Although CAL saw "almost no use", it had a lasting impact by influencing the design of Tymshare SUPER BASIC which copied a number of its features. Some of those features, in turn, appeared in BASIC-PLUS on the PDP-11, which is the direct ancestor of Microsoft BASIC.