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-.\" Copyright (c) 1979 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"	@(#)pxin0.n	5.2 (Berkeley) 4/17/91
-.\" $FreeBSD$
-.\"
-.RP
-.TL
-Berkeley Pascal
-PX Implementation Notes
-.br
-Version 2.0 \- January, 1979
-.AU
-William N. Joy\*(Dg
-.AU
-M. Kirk McKusick\*(Dd
-.AI
-Computer Science Division
-Department of Electrical Engineering and Computer Science
-University of California, Berkeley
-Berkeley, California  94720
-.AB
-.PP
-Berkeley Pascal
-is designed for interactive instructional use and runs on the
-.SM "VAX 11/780" .
-The interpreter
-.I px
-executes the Pascal binaries generated by the Pascal translator
-.I pi .
-.PP
-The
-.I
-PX Implementation Notes
-.R
-describe the general organization of
-.I px ,
-detail the various operations of the interpreter,
-and describe the file input/output structure.
-Conclusions are given on the viability of an interpreter
-based approach to language implementation for an instructional environment.
-.AE
-.if n 'ND
-.SH
-Introduction
-.PP
-These
-.I
-PX Implementation Notes
-.R
-have been updated from the  original 
-.SM "PDP 11/70"
-implementation notes to reflect the interpreter that runs on the
-.SM "VAX 11/780" .
-These notes consist of four major parts.
-The first part outlines the general organization of
-.I px .
-Section 2 describes the operations (instructions) of the interpreter
-while section 3 focuses on input/output related activity.
-A final section gives conclusions about the viability of an interpreter
-based approach to language implementation for instruction.
-.SH
-Related Berkeley Pascal documents
-.PP
-The
-.I "PXP Implementation Notes"
-give details of the internals of the execution profiler
-.I pxp;
-parts of the interpreter related to
-.I pxp
-are discussed in section 2.10.
-A paper describing the syntactic error recovery mechanism used in
-.I pi
-was presented at the ACM Conference on Compiler Construction
-in Boulder Colorado in August, 1979.
-.SH
-Acknowledgements
-.PP
-This version of
-.I px
-is a
-.SM "PDP 11/70"
-to
-.SM "VAX 11/780"
-opcode mapping of the original
-.I px
-that was designed and implemented by Ken Thompson,
-with extensive modifications and additions
-by William Joy
-and Charles Haley.
-Without their work, this
-.UP
-system would never have existed.
-These notes were first written by William Joy for the
-.SM "PDP 11/70"
-implementation.
-We would also like to thank our faculty advisor Susan L. Graham
-for her encouragement,
-her helpful comments and suggestions
-relating to
-.UP
-and her excellent editorial assistance.
-.FS
-\*(dg\ The financial support of the National Science Foundation under grants
-MCS74-07644-A03 and MCS78-07291
-and of an \s-2IBM\s0 Graduate Fellowship are gratefully acknowledged.
-.FE
-.FS
-\*(dd\ The financial support of a Howard Hughes Graduate 
-Fellowship is gratefully acknowledged.
-.FE
-.bp