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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
+.\"
+.if !\n(xx .so tmac.p
+.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