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.CENTER;^JUNE 18, 1977
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^DEAR <PASCAL ^USER:
.P
^ENCLOSED IS THE BOOTSTRAP <PASCAL COMPILER FROM ^JOHN ^BARR AT
^HUGHES ^AIRCRAFT ^COMPANY. 
^IT CONSISTS OF THE <MACRO SOURCE FILES FOR BOTH PASSES OF THE
COMPILER AND THE RUN TIME SYSTEM.
^IT HAS BEEN WRITTEN ONTO YOUR TAPE WITH A 9-TRACK 800BPI TAPE
DRIVE USING THE <FLX UTILITY PROGRAM WHICH PRODUCES A <DOS FORMATTED
FILE DIRECTORY ON THE TAPE.
^THE FOLLOWING ACCOUNTS ARE ON THE TAPE:
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[70,1] ^VARIOUS <PASCAL SOURCE, OBJECT, COMMAND AND TASK FILES
WHICH HAVE BEEN COMPILED AND USED AT ^HUGHES.  ^SOME OF THE
FILES WHICH MAY BE INTERESTING ARE:
.LIST 1
.LE;<TWOCOL - GENERATES TWO COLUMN LISTINGS
.LE;<TCLRNO - GENERATES TWO COLUMN LISTINGS FROM <RUNOFF OUTPUT FILES
.LE;<PRTINT - PRINTS <PASS1 INTERNAL FORMAT
.LE;<TOWERP - ^TOWER OF ^HANOI PROGRAM
.LE;<ACONTR - ^TERMINAL LOGON ACCOUNTING PROGRAM WRITTEN AT ^HUGHES
.LE;<OBJBRK - ^OBJECT FILE BREAKER WHICH CAN BE USED TO LIST OUT THE
CONTENTS OF AN OBJECT FILE.
.ELS
^ALSO CONTAINED UNDER [70,1] ARE FILES EXPLAINING HOW TO USE THIS <PASCAL
COMPILER AND HOW IT INTERFACES WITH <RSX-11D,M. (SEE <PASCAL.DOC AND
<RSXPASCAL.DOC)
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[70,2] <BSM MACRO SOURCES AND LIBRARY, <BSM RUN TIME LIBRARY, AND
<RSX-11D RUN TIME ROUTINES.
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[70,3] (EMPTY) USED FOR LISTINGS
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[70,4] <BSM SOURCE, OBJECT AND TASK FILES FOR <PASCAL PASS ONE.
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[70,5] <BSM SOURCE, OBJECT AND TASK FILES FOR <PASCAL PASS TWO.
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[70,7] <RSX-11M REPLACEMENT FILES FOR <BSM LIBRARY, COMPILER, AND
RUN TIME SYSTEM.
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[70,10] <SUPERMAC MACROS WHICH MUST BE USED TO ASSEMBLE <PASLIB.MAC
.P
^THE FOLLOWING INSTRUCTIONS ARE FOR BUILDING <PASCAL ON <RSX-11D,M
SYSTEMS.  ^FOR OTHER SYSTEMS SUCH AS <RSTS ADDITIONAL INSTRUCTIONS
WILL BE SENT OUT WHEN THE PROCEDURE FOR THOSE SYSTEMS IS ESTABLISHED.
^IF POSSIBLE, INITIALIZE <UFD,\S [70,1 THRU 10] ON YOUR SYSTEM DISK
AND USE <FLX WITH THE FOLLOWING COMMAND LINE TO COPY THE FILES FROM
TAPE TO DISK:
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^^FLX SY:/RS/UI=MT0:[*,*]*.*/DO\\
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^AFTER THE FILES HAVE BEEN TRANSFERED TO THE SYSTEM DISK, A <RSX-11D
<PASCAL COMPILER CAN BE BUILT IMMEDIATELY BY:
.LIST 1
.LE;^LOG ON TO [70,4] AND <TKB <@TKBPASCAL.
.LE;^LOG ON TO [70,5] AND <TKB <@TKBPASS2.
.LE;^LOG ON TO [1,1] AND INSTALL [70,4]<PASCAL AND [70,5]<PASS2.
.ELS
^FOR <RSX-11M SYSTEMS THE FILES CONTAINED UNDER [70,7] MUST REPLACE
THE SAME FILES UNDER [70,4] AND [70,5].
^THE <BSM LIBRARY FILE UNDER [70,7] HAS ALREADY BEEN BUILT FOR
<RSX-11M BUT THE <PASLIB.MAC FILE MUST BE ASSEMBLED USING THE
FOLLOWING COMMAND LINE:
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^^MAC PASLIB,PASLIB/-SP=[70,10]SUPER/ML,[70,2]PASLIB\\
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^NOTE THAT THE ABOVE COMMAND LINE ASSUMES THAT YOU HAVE ALREADY
REPLACED THE <RSX-11D FILES WITH THE <RSX-11M FILES FROM [70,7].
^THE COMPILER MAY THEN BE BUILT WITH THE COMMAND FILES FROM [70,2]
WHICH YOU MAY WANT TO MODIFY TO INCLUDE A REFERENCE TO YOUR
SYSTEM LIBRARY.
^AFTER THE COMPILER HAS BEEN TASK BUILT AND INSTALLED, IT WILL
FUNCTION IDENTICALLY TO THE <RSX-11D COMPILER.
.P
^PLEASE BE PATIENT WITH THIS VERSION OF THE COMPILER.
^IT IS A BOOTSTRAP COMPILER WHICH HAS ITS FAULTS OF WHICH THE FOLLOWING
IS A PARTIAL LIST OF NON-FUNCTIONAL ITEMS:
.LIST 1
.LE;^REAL (FLOATING POINT) OPERATIONS NOT YET IMPLEMENTED.
.LE;^THE MOD FUNCTION ONLY WORKS FOR POWERS OF TWO.
.LE;^THE FOR CONSTRUCT IS NOT IMPLEMENTED.
.LE;^THE WITH CONTRUCT IS UNSTABLE.
.LE;^CERTAIN EXPRESIONS DO NOT PRODUCE CORRECT RESULTS.
^THIS WILL USUALLY BE NOTICED WHEN PARENTHESIS MUST BE USED
TO ORDER EVALUATION.  ^A GOOD RULE OF THUMB IS TO USE ONLY
SINGLE LEVEL EXPRESIONS IN ALL CASES.
.LE;^FUNCTION CALLS WITHIN EXPRESIONS DO NOT ALWAYS PRODUCE
CORRECT RESULTS.
.ELS
.P
^FOR THOSE OF YOU WHO HAVE SENT ME TWO TAPES, THE SECOND TAPE
WILL BE KEPT AND USED TO SEND OUT ADDITIONAL RELEASES OF
<PASCAL COMPILERS AS THEY BECOME AVAILABLE.  ^AT THIS
TIME THE ^SWEDISH COMPILER WILL BE THE FIRST ADDITIONAL RELEASE.
^A FUTURE RELEASE OF THIS COMPILER WHEN THE VERSION WRITTEN IN
<PASCAL IS COMPLETED IS PLANNED ALSO.
.P
^I WOULD APPRECIATE ANY COMMENTS ON THE OPERATION OF THIS AND FUTURE
COMPILERS. ^THIS WILL ALLOW THE <PASCAL <SIG TO GENERATE A COMPILER
WHICH CAN BE USED FOR MOST OF THE <DEC OPERATING SYSTEMS AND WHICH
SHOULD RUN ON ALL <PDP-11\S.
.P
^THANK YOU FOR YOUR INTEREST.
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^SINCERELY YOURS,
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^JOHN ^R.  ^BARR
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377/^C209
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^HUGHES ^AIRCRAFT ^COMPANY
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^BOX 92919
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^LOS ^ANGELES, ^CALIFORNIA  90009