15 Facts About UCSD Pascal

UCSD Pascal is a Pascal programming language system that runs on the UCSD p-System, a portable, highly machine-independent operating system.

In 1977, the University of California, San Diego Institute for Information Systems developed UCSD Pascal to provide students with a common environment that could run on any of the then available microcomputers as well as campus DEC PDP-11 minicomputers.

Notable extensions to standard UCSD Pascal include separately compilable Units and a String type.

The UCSD Pascal p-Machine was optimized for the new small microcomputers with addressing restricted to 16-bit .

Urs Ammann, a student of Niklaus Wirth, originally presented a p-code in his PhD thesis, from which the UCSD implementation was derived, the Zurich Pascal-P implementation.

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The UCSD Pascal implementation changed the Zurich implementation to be "byte oriented".

The UCSD p-code was optimized for execution of the Pascal programming language.

UCSD Pascal compiler was distributed as part of a portable operating system, the p-System.

UCSD Pascal p-System began around 1974 as the idea of UCSD Pascal's Kenneth Bowles, who believed that the number of new computing platforms coming out at the time would make it difficult for new programming languages to gain acceptance.

UCSD Pascal based UCSD Pascal on the Pascal-P2 release of the portable compiler from Zurich.

UCSD Pascal was particularly interested in Pascal as a language to teach programming.

Pascal dialect of UCSD Pascal came from the subset of Pascal implemented in Pascal-P2, which was not designed to be a full implementation of the language, but rather "the minimum subset that would self-compile", to fit its function as a bootstrap kit for Pascal compilers.

UCSD Pascal added strings from BASIC, and several other implementation dependent features.

Sales revived somewhat, due mostly to Pecan's reasonable pricing structure, but the p-System and UCSD Pascal gradually lost the market to native operating systems and compilers.

The "innovative concept" of the Constellation OS was to run UCSD Pascal and include all common software in the manual, so users could modify as needed.