Berkeley Pascal PX Implementation Notes

Version 1.1 - April, 1979

William N. Joy*

Computer Science Division
Department of Electrical Engineering and Computer Science
University of California, Berkeley
Berkeley, California 94720

* The financial support of the National Science Foundation under grants MCS74-07644-A03 and MCS78-07291 and of an IBM Graduate Fellowship are gratefully acknowledged.


Berkeley Pascal is designed for interactive instructional use and runs on the PDP 11 computer family. A version of px for the VAX 11/780 is nearly complete. The interpreter px executes the Pascal binaries generated by the Pascal translator pi .

The PX Implementation Notes describe the overall organization of px , detail the various operations of the interpreter, with a special section describing the file input/output structure. Conclusions are given as to the viability of an interpreter based approach to language implementation for an instructional environment.

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