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Clascal was the first working prototype of Object Pascal developed in 1983 by the Personal Office Systems (POS) division of Apple Computer (later renamed to The Lisa Division, still later to The 32-Bit Systems Division). It was the first true object-oriented version of Pascal.
Clascal was an extension of Lisa Pascal and strongly inspired by Xerox PARC's release of Smalltalk-80 and the language Modula. In turn it laid the foundation for the development of Apple's Object Pascal, later referred to as Mac Pascal.
- Keohan, Susan. "An Introduction to Clascal -- Alpha Draft". September 15, 1983. Lisa Division, Apple Computer. Cupertino, California. (A later version from 1984 is available as scanned PDF file).