From: jfmburg@cs.vu.nl (JFM Burg)
Newsgroups: comp.object
Subject: Re: Object-Oriented Prolog
Date: 6 Oct 92 08:20:54 GMT
Organization: Fac. Wiskunde & Informatica, VU, Amsterdam
X-Newsreader: TIN [version 1.1 PL6]


Hey,

I don't have any experience with an object oriented prolog, but I do have a
list of Prolog-vendors. Some of these guys pretend if their product is OO,
so you may want to check this. There's a list of product-properties included.
(I couldn't reach you with e-mail, but anyway...)

I hope it will help,

c-ya,
					Hans

<-------- CUT HERE --------->
---------------------------------------------------------------------
---------------------------------------------------------------------
NAME:		Advanced AI Systems Prolog
VERSION:	M-1.15
SRC/MACHINE/OS:	Macintosh Plus, Macintosh SE, Macintosh II compatible.
COST:		$199
FEATURES:
   Edinburgh syntax; pretty printer; global variables; DCGs;
   arithmetic and strings; garbage collection; graphics;
   lisp machine like interface, edit complie eval interactively;
   access to Macintosh toolbox; interactive debugger.
CONTACT:	Advanced AI Systems, Inc.
		P.O. Box 39-0360
		Mountain View, CA 94039
		(415) 948-8658
NOTES:	Reviewed in MACGUIDE winter 1987.
DATED:		Feb 1988
---------------------------------------------------------------------
NAME:           A.D.A. Prolog
VERSION:        First release, dated 1985
SRC/MACHINE/OS: C / MSDOS and PCDOS systems
AVAILABILITY:	Full version from May 1985; five versions of
		increasing complexity available separately;
		educational and commercial licenses.
COST:           ??
FEATURES:       
    Incremental compiler, VML virtual memory system and extensions
    invisible to user, database access routines, debugging, stream
    input, list-based structure sharing, UNIX style modules, incre-
    mental garbage collection, Edinburgh-compatible syntax.
CONTACT:        Automata Design Associates
		1570 Arran Way
		Dresker, PA 19025
		(215) 335-5400
DATED:          June 1985
---------------------------------------------------------------------
NAME:		ALS Prolog
VERSION:	PC: 1.1 (shipping 1.2 soon)
		Mac: 1.0
SRC/MACHINE/OS: PC,XT,AT; VAXMate; Mac; SUN3 in beta test
AVAILABILITY:	commercial and educational site licenses available
COST:		PC: $499 professional, $199 personal
		Mac: $349 (no professional/personal distinction)
STATUS:
FEATURES:
    Incremental interactive compiler, needs no interpreter:
    compiles full Prolog "on the fly"; modules, garbage collection,
    tail recursion; standard debugger, assert, clause, etc. operate
    on compiled code; C interface, real strings, screen control,
    interrupt handling, DCGs.
    Professional version has virtual code space (almost unlimited
    program size; stand-alone applications generator; DOS interface,
    PC windowing primitives.  Mac version has multi-window interface,
    integrated editor; graphics, windowing.
CONTACT:	Applied Logic Systems, Inc.
		P.O. Box 90, University Station
		Syracuse, NY 13210-0090 USA
		(315) 471-3900
DATED:		Feb 1988
---------------------------------------------------------------------
NAME:		Arity/Prolog V5.0
SRC/MACHINE/OS:	IBM-PC and compatibles, the compiler is written in
		Arity/Prolog
AVAILABILITY:	Feb 88
COST:		??
FEATURES:
    Interpreter and compiler, with debugger; "string support",
    embedded 'C' language expression and interface, UNIX-style file I/O
    and systems functions, windowed text screen management; DCG support;
    database supports B-trees, hash tables.
CONTACT:	Arity Corporation
		30 Domino Drive
		Concord, MA 01742
		(617) 371-1243

DATED:		Feb 1988
---------------------------------------------------------------------
NAME:		Basser Prolog
VERSION:	3
SRC/MACHINE/OS:	C/Unix (V7, 4.?BSD & others) also VMS
AVAILABILITY:	Educational license, source or binary
COST:		A$300 or US$300 or negotiable, VMS version extra
STATUS:		running, some development & support
FEATURES:
    Fast interpreter, full interface to Unix, Dec-10 debugging
    facilities, real arithmetic, backtrackable I/O, good docu-
    mentation (user manual & tutorial).
CONTACT:	Andrew Taylor (USENET: mulga!basser!andrewt)
		Department of Computer Science
		Sydney University
		Sydney, N.S.W.  2006
		Australia
NOTES:
    Yet another prolog syntax. Most of the code is clean and readable.
    Generally similar to DEC-10 prolog.  Basser Prolog has sufficient
    "features" to make it a reasonable programming environment and a
    useful tool.
DATED:		May 1984
-------------------------------------------------------------------------
NAME:           BIM-Prolog
VERSION:        ?
SRC/MACHINE/OS: VAX and SUN/4.2bsd UNIX
AVAILABILITY:   Academic and commercial
COST:           Varies; discounts for academic users.
FEATURES:
    Compiler/interpreter, algorithmic debugging, external language
    interface, graphics and windowing, module concept, partial
    evaluation, relational database interface (Unify & Ingres).
CONTACT:       
    Raf Venken				The SHURE Group
    Belgian Institute of Management	1514 Pacific Ranch Dr.
    Kwikstraat 4			Encinitas, CA 92024
    3078 Everberg			(sun!suntan!bshure)
    B-Belgium
    (02) 759-5925			(619) 944-0320
DATED:          Feb 1988
-------------------------------------------------------------------------
NAME:		Blog - a "prolog system" with readable code
SRC/MACHINE/OS:	Franz Lisp.  Porting should be trivial.
AVAILABILITY:
    One page prettyprinted. Also available a 1K (1024 byte) source code
    version, including comments, title, user manual and installation
    guide (I'll admit, short ones). Two-page user manual also available.
COST:
    Free, mail me and I'll try to mail it to you.  Distribute freely,
    but keep saying it's mine, and (more important) tell me about ports,
    enhancements, etc.
FEATURES:
    Pure Prolog, so no cut, assert or retract. Lisp syntax.  No
    special handling of clause names, so variables may appear anywhere
    (except one var as body of a clause).  Therefore second order logic
    possible.  No operators but dot. Slow - not written to run but to
    let people read the code. Numbers are used to denote internal
    variables.  Advantage: different vars have different names;
    Disadvantage: numbers can neither be used as variables, nor as
    constants.  No packages, so what would one want to use numbers
    for?
CONTACT: 	J. A. Biep Durieux
		 (mcvax!cs.vu.nl!biep@seismo.css.gov)
NOTES:
    It's really not much more than the famous "tiniest little prolog in
    the world".
	 Support: Try to mail me, I may be in a good mood.
	 Future: Module compiler and much faster interpreter almost
		 ready. Perhaps version with cut, or with adequate negation.
DATED:		Sept 1987
---------------------------------------------------------------------
NAME:		BNR Macintosh Prolog
VERSION:	(0.15)
SRC/MACHINE/OS:	Apple Macintosh Plus/SE Mac II (BW & Color);
		written in 68000 assembler, Prolog, and MPW Pascal.
AVAILABILITY:	Experimental use at Bell Northern Research
		(not publicly released)
COST:		N/A
FEATURES:
   Complete MPW-like Prolog programming environment with editor windows, 
   interpreter, and 4-port debugger. High-level graphics description language
   with access to Mac Toolbox (Quick Draw, dialogues, event handling etc).
   Dialect extensions include nested module structure, cyclic structures,
   freeze and diff, soft cut and ancestor cut, "logical" real arithmetic
   (i.e. constraint arithmetic for real intervals), variable name
   retention, variable functors and variable arity predicates. 
STATUS:	N/A
CONTACT:	Marianne Morin
		Bell Northern Research
		P.O. Box 3511 Station C
		Ottawa Ontario
		Canada K1Y 4 H7
		(613) 763-2835
		morin @ BNR.BITNET
		
DATED:		February 1988
---------------------------------------------------------------------
NAME:		C-Prolog
VERSION:	1.5
SRC/MACHINE/OS:	C/UNIX 4.1/2 BSD, C/VMS
AVAILABILITY:	Academic and commercial licenses
COST:		100 pounds, academic
		updates (if you have earlier version) 50 pounds
FEATURES:
    Interpreter, Prolog-10 compatibility, four port debugger.
CONTACT:
    Department of Architecture		SRI International
    Edinburgh Univeristy		333 Ravenswood Ave.
    Forest Hill Rd.			Menlo Park, CA 94025
    Edinburgh  EH1 1GZ
    U.K.
    (decvax!mcvax!ukc!edcaad!margaret)
DATED:		July 1984
-------------------------------------------------------------------------
NAME:		Caltech Prolog (tentative)
VERSION:	0.2
SRC/MACHINE/OS:	IBM, written in Prolog and 370 assembly
AVAILABILITY:	Not being distributed.
FEATURES:
    Compiler completely compiles itself, but some normal glue routines
    still missing.  Speed of about 1 Megalip on an IBM 3090 for naive
    reverse.
CONTACT:	Mike Newton (newton@vlsi.caltech.edu)
DATED:		Oct 1987
-------------------------------------------------------------------------
NAME:		CLP(R)
VERSION:	2.0
SRC/MACHINE/OS: C / VAXen,Pyramid,Sun,etc. / UNIX
AVAILABILITY:	educational or research, site license
COST:		$150 (Australian?)
FEATURES:
    Interpreter, targetted at educational or research usage.

    The CLP(R) language is an instance of the Constraint Logic
    Programming scheme described in [Jaffar & Lassez 87].  Its
    operational mode is similar to that of Prolog.  A major
    difference is that unification is replaced by a more general
    mechanism: solving constraints in a domain of uninterpreted
    functors over real arithmetic. (from the programmer's manual)
CONTACT:	clp@moncsbruce.oz.au
		munnari!moncsbruce.oz!clp@seismo

		CLP(R) Distribution
		Department of Computer Science
		Monash University
		Clayton, Victoria 3168
		Australia
NOTES:
    Jaffar,J. & Lassez,J-L., "Constraint logic programming",
    POPL, Munich, Jan 87.
DATED:		June 1987
-------------------------------------------------------------------------
NAME:		Edinburgh Prolog (formerly NIP)
VERSION:	1.5.02 (1 December 87)
SRC/MACHINE/OS: C and Prolog / UNIX
AVAILABILITY:	Educational, research, and commercial
COST:		details from contact below
FEATURES:
    Compatibility with DEC-10 and C-Prolog, compilation to intermediate
    code, real arithmetic, interface to user C routines.
CONTACT:	Robert Rae, AI Applications Institute,
		University of Edinburgh, 80 South Bridge,
		EDINBURGH EH1 1HN, United Kingdom.
NOTES:
    Intended to be portable onto any 32-bit UNIX system, but not usually
    supplied in source form.  Executable versions currently available for
    VAX BSD, SUN, Gould UTX32, Pyramid, etc.  Development funded
    principally by Alvey initiative.
DATED:		Dec 1987
-------------------------------------------------------------------------
NAME:           EqL (Equational Language)
VERSION:        1.0  
SRC/MACHINE/OS: C / Unix
AVAILABILITY:	Anyone
COST:           None.  Access by FTPing to mercury.cs.unc.edu, log in as
		ftp, use your name as password, connect to directory
		pub/EqL, and get all files in directory.  Will mail a tape
		if unable to access by FTP.
FEATURES:       
    Combines logic and functional programming, rule-based language, 
    functional syntax, interpreter is essentially an equation solver, 
    has tracing, runs about half as fast as C-Prolog interpreter,
    tutorial available.
CONTACT:        Bharat Jayaraman
		Computer Science Department
		University of N. Carolina at Chapel Hill
		Chapel Hill, NC 27514

		bj@cs.unc.edu
		(919) 962-1764
DATED:          December 1987
NOTES:
    The language was first described in the 1986 LISP & FP conference.
    Several papers and reports available.  The language has been
    extensively tested, and also used in a graduate programming language
    class.  Compiled version being planned.
-------------------------------------------------------------------------
NAME:		ExperProlog-II
SRC/MACHINE/OS: Macintosh
COST:		$495
FEATURES:
    Based on Alain Colmerauer's Prolog-II: infinite trees, "freeze"
    operator, etc.; non-standard Mac interface.
CONTACT:	ExperTelligence Inc.
		559 San Ysidro Rd.
		Santa Barbara, CA 93108
		(805) 969-7871
NOTES:	See review in April 1987 issue of Dr. Dobbs and March 1987
	 issue of MacUser.
DATED:		Jan 1988
-------------------------------------------------------------------------
NAME:		GProlog
VERSION:	Versions corresponding to C-Prolog versions 1.4 and 1.5
SRC/MACHINE/OS: C with some assembler/Sun 2 and Sun 3/SunOS (4.2 BSD)
AVAILABILITY:	Anyone
COST:
    Send a magtape and $10 to cover postage and handling.  Will store
    files in tar format.  Specify which version of C-Prolog you are using.
STATUS:
    Has been in use for several years, including use in a couple of large
    projects.
FEATURES:	Adds SunCore graphics predicates to C-Prolog
CONTACT:	Barry Brachman		   {ihnp4!alberta,uw-beaver,seismo}!
		Dept. of Computer Science 	ubc-vision!ubc-cs!brachman
		Univ. of British Columbia  brachman@cs.ubc.cdn
		Vancouver, B.C. V6T 1W5  
		(604) 228-4327
DATED:		August 1987
NOTES:
    A few of the SunCore routines are not available to GProlog.  The
    distribution consists of patches to be applied to the original
    C-Prolog 1.4 or 1.5 sources; C-Prolog is *not* included in the
    distribution.  Will email the 6 page manual in LaTeX form upon
    request.
-------------------------------------------------------------------------
NAME:		Horne
VERSION:        28
SRC/MACHINE/OS:	Common Lisp / Explorer (v2.1) & Symbolics 36xx (v7.1)
AVAILABILITY:	Full Sources are distributed to anyone, upon signing a
		license/disclaimer for non-commercial use.
COST:		$150 (academic), TR for $2.50  Non-academic institutions
		are requested to send whatever they can afford over $150
		to help defray expenses.
FEATURES:
    LISP interface; tracing and debugging; typed theorem proving;
    automated reasoning facilities include forward chaining, constraint
    posting. Also included: REP, Knowledge Representation extensions, that
    allow reasoning about structured types, classification of objects, etc.
    Similar in spirit to KL-1, but internal representation is consistent
    with Horn clause notation, allowing for more flexible systems.
CONTACT:
    Admin: (distribution, TR) Rose Peet (rose@cs.rochester.edu)
    Technical: Brad Miller (miller@cs.rochester.edu)
    Author: James Allen (james@cs.rochester.edu)

		 Computer Science Dept.
		 River Campus
		 University of Rochester
		 Rochester, NY 14627
NOTES:
    Some zetalisp code mixed in with Common Lisp.
    System is distributed, but no longer supported at Rochester, see entry
    for Rhet (q.v.).
DATED:		April 1988
---------------------------------------------------------------------
NAME:           HP Prolog
VERSION:        1.0 (product# 79232U)
SRC/MACHINE/OS: Common Lisp / HP9000/300 / HP-UX (System V)
		 (source not available)
AVAILABILITY:   Hewlett Packard
FEATURES:
    Runs in HP's Common Lisp environment, allowing very transparent
    combination of Lisp and Prolog programs.  Since Lisp has complete
    foreign-function calling capabilities, Prolog has access to all
    HP-UX intrinsics, graphics/networking libraries, etc.  Supports 
    two syntaxes: Q-Prolog, a Quintus compatability mode, and Z-Prolog,
    a Lisp-like S-expression syntax.  Includes interpreter, compiler,
    screen-oriented 4-port debugger, etc.
CONTACT:        Your local HP sales office
DATED:          December 1987
---------------------------------------------------------------------
NAME:           ICL Prolog
VERSION:        First release dated 1984
SRC/MACHINE/OS: Pascal / VME on ICL 2900 to intermediate code
AVAILABILITY:   Commercial license.
COST:           Complete package priced at 400 pounds per quarter,
		 including functional LISP.
FEATURES:
    Compiler; lexical modules for construction of large applications;
    incremental garbage collection, tail recursion optimization,
    early detection of determinacy, clause indexing, trace and
    debugging facilities; large address space, interface to other
    languages.
CONTACT:        J. W. Doores
		International Computers Ltd.
		Wenlock Way, West Gorton
		Manchester M12 5DR
		Tel: 061-223 1301
DATED:          June 1985
NOTES:
    Improved version to be released soon written in 'C' and Prolog,
    for UNIX on Orion and PERQ PNX systems.
---------------------------------------------------------------------
NAME:		IF/Prolog
VERSION:	?
SRC/MACHINE/OS:	Apple Macintosh; Apollo/UNIX; Data General AOS/VS;
		DEC VMS/ULTRIX; IBM-PC/MS-DOS/UNIX; SUN UNIX;
		HP9000/300, HP9000/800
COST:           30% discount to non-commercial research institutions.
FEATURES:
    Interpreter, compiler; interfaces to operating system, GKS
    (Graphics Kernel System) database (Oracle/Informix/...) and C
    functions; emacs editor; full screen box debugger.
CONTACT:	InterFace Computer Gmbh.
		Garmischer Strasse 4	Phone: (089) 510 86 55
		D-8000 Munich 2		karin@ifcom.uucp
		Germany
NOTES:
    Also offer tutorials/courses and consulting in either English
    or German.
DATED:		Sept 1987
---------------------------------------------------------------------
NAME:		Lambda Prolog
VERSION:	2.6
SRC/MACHINE/OS: C-Prolog 1.5, straightforward conversion to Quintus
AVAILABILITY:
    Available by FTP from linc.cis.upenn.edu; log in as anonymous, use
    your login id as password; cd pub/lp2.6; retrieve the code in the
    subdirectory.
    Can mail tar format tapes for those who cannot FTP.
CONTACT:
	 Dale Miller (dale@linc.cis.upenn.edu)
	 University of Pennsylvania
    or
	 Gopalan Nadathur (gopalan@cs.duke.edu)
	 Duke University
FEATURES:
    Lambda Prolog extends Prolog by
	 (1) using typed lambda-terms instead of first-order terms,
	 (2) permitting quantification over function and predicate variables
	 (3) performing higher-order unification and lambda-conversion
	 (4) permitting and interpreting universally quantified goals, and
	 (5) containing a notion of modules.
    This logic programming language provides many of the higher-order
    features which are common in functional programming languages.  The
    availability of higher-order unification, however, gives this
    language a certain kind of richness not present in other programming
    languages.  We illustrate this richness by demonstrating how this
    language can be used to provide novel specifications of
	 (1) theorem provers and proof systems,
	 (2) program transformation algorithms, and
	 (3) knowledge representation systems.
DATED:	Sept 1987
---------------------------------------------------------------------
NAME:		LISPLOG
VERSION:	2
SRC/MACHINE/OS:	SYMBOLICS COMMON LISP and FRANZ LISP or COMMON LISP
		 in UNIX on VAX, APOLLO, SUN, and IBM-RT
AVAILABILITY: 	Unrestricted.
COST: 		Still free
FEATURES:
    Iterative interpreter and CProlog translator; several LISP/PROLOG
    interfaces; varying-length structures; predicate variables;
    specialized cut operator and initial-cut tools; zoom-box model;
    modules; streams; forward-chaining extensions; micro-UNIXPERT
    system.
CONTACT: 	LISPLOG-Buero, AG Richter
		FB Informatik, Univ. Kaiserslautern
		Postfach 3049
		6750 Kaiserslautern
		W. Germany
		E-mail: lisplog@uklirb.UUCP
DATED:		September 1987
NOTES:		Recursive interpreter (version II) also supported.
---------------------------------------------------------------------
NAME:		LM-Prolog
SRC/MACHINE/OS:	ZetaLisp/LMI Lambda
AVAILABILITY:	commercial and non-commercial licenses.
STATUS:		Stable.
FEATURES:
    Compiles to Zetalisp, interpreter, "4 port" debugger, microcode
    support, worlds, indexing, lazy and eager collections,
    constraints; Concurrent Prolog interpreter; backtracking Turtle
    graphics; interface to Lisp; optional occur check, optional
    cyclic structures, mutable arrays, full Lisp machine environment;
    DEC-10 Prolog compatibility package.
CONTACT:	Mats Carlsson
		SICS
		PO Box 1263
		S-16313 SPANGA, Sweden
		mats-c@sics.se
DATED:		December 1986
---------------------------------------------------------------------
NAME:           LOGLISP
VERSION:        Version 3 (dated 1984)
SRC/MACHINE/OS: UCI Rutgers LISP/DEC 10; Zetalisp/LMI Lambda;
		Symbolics 3600.
AVAILABILITY:   Commercial, academic and US Government licenses.
COST:           $30 to $400, depending on license.
FEATURES:
    Interpreter incorporating breadth-first and heuristic search mode
    and notion of reducibility; LISP host environment with embedded
    logic programming system; uses structure sharing techniques with
    reduction; functions in modules; set of new LISP primitives
    callable from within LISP programs.
CONTACT:        K. J. Greene
		313 Link Hall
		School of Computer and Information Science
		Syracuse University
		Syracuse, NY 13210
DATED:          June 1985
---------------------------------------------------------------------
NAME:		LPA Mac-Prolog
SRC/MACHINE/OS:	Macintosh, 512K
COST:		$295, optimizing compiler $100
FEATURES:
    Incremental compiler and interpreter; editing of windows with
    cut, paste, find and replace compiled upon initiation of a
    command or query.  Independent multiple evaluations can be
    initiated in separate evaluation spaces.  Full window and menu
    support available through Prolog primitives.
CONTACT:	Programming Logic Systems, Inc.
NOTES:	See August 1986 issue of Computer Language and March 1987
	issue of MacUser.
DATED:		Jan 1988
---------------------------------------------------------------------
NAME:		MacPROLOG
SRC/MACHINE/OS:	Macintosh
COST:		$295 MacPROLOG, $100 optimizing compiler
FEATURES:	Micro-Prolog for the Macintosh.
CONTACT:	Programming Logic Systems, Inc.
		31 Crescent Dr.
		Milford, CT 06460
		(203) 877-7988
NOTES:	From review in April 1987 issue of Dr. Dobbs.
DATED:		Jan 1988
---------------------------------------------------------------------
NAME:           Micro-Prolog
VERSION:        3.1 (dated March 1984)
SRC/MACHINE/OS: Assembler/ CP/M-80 and MSDOS microcomputers.
AVAILABILITY:   Academic and commercial licenses available.
COST:           For CPM80 machines: 125 pounds or $195;
		for CPM86/MSDOS/PCDOS machine: 175 pounds or $295;
		special rates for educational institutions.
FEATURES:
    Extensibility of supervisor made possible by modules; interactive
    program text editor; editor and trace utility modules; real
    numbers; memory trace facility; SIMPLE extension to supervisor;
    DEC-10 front end for machines with >64KB memories; APES -- Expert
    System Shell available.
CONTACT:
    Programming Logic Systems	Logic Programming Associates
    31 Crescent Drive		Studio 4,
				The Royal Victoria Patriotic Building
    Milford, CT 06460		Trinity Road
				London SW18 6SX
DATED:          June 1985
---------------------------------------------------------------------
NAME:           Modula-Prolog
SRC/MACHINE/OS: Modula-2, MS-DOS, VAX VMS and UNIX
AVAILABILITY:   ?
COST:           ?
FEATURES:
    Modula-Prolog is a software package written in Modula-2, offering
    tools for constructing Prolog interpreters which can interact in
    many ways with other Modula-2 programs.  Fully compatible with
    Clocksin & Mellish.
CONTACT:        Carlo Muller
		Brown Boveri Research
		CH-5405 Baden
		Switzerland
DATED:		Sept 1985
---------------------------------------------------------------------
NAME:		MProlog
VERSION:	1.5 (dated 1984)
SRC/MACHINE/OS:	CDL2 & Prolog; DEC VAX: VMS and UNIX (4.2 BSD);
		IBM: VM/CMS, MVS/TSO; IBM-PC: PC DOS; 68000 based
		UNIX variations; Tektronix 4404 workstation; HP3000.
AVAILABILITY:	wide range-- commercial, educational, per CPU, OEM
		distribution and run-time licenses
COST:		Educational and OEM discounts available.
FEATURES:
    Interpreter, compiler; program development environment -
    interactive editor, concurrent proof editing, trace facilities;
    user-defined error handling; garbage collection; over 250
    built-in predicates; external routine interfaces; modularity;
    portability
CONTACT:	Logicware Inc.
		5000 Birch Street
		West Tower, Suite 3000
		Newport Beach, CA 92660
		(714) 476-3634
	 or 
		Logicware Inc.
		1000 Finch W., Suite 600
		Toronto, Canada  M3J 2V5
		(416) 665-0022
	 or
		Systems, Computers and Informatics Laboratory, SZKI
		1368 Budapest, POB 224
		Hungary
DATED:		March 1985
---------------------------------------------------------------------
NAME:		MU-Prolog
VERSION:	3.2
SRC/MACHINE/OS:	C/UNIX on VAX, SUN, Perkin Elmer, Pyramid, Gould,
		 Elxsi... (portable to most UNIX systems)
AVAILABILITY:	Now, non-military education and research only.
COST:		$200 (Australian)
STATUS:		Stable
FEATURES:	DEC-10 compatibility, database system, coroutines
CONTACT:	Lee Naish
		(lee@mulga.oz.au, munnari!lee@seismo.css.gov.us)
		Department of Computer Science
		University of Melbourne
		Parkville, Victoria  3052
		Australia
NOTES:
    Extra control facilities enable coroutining.  Negation and other
    predicates are delayed when insufficiently instantiated.  The
    database system allows terms containing functors and variables
    to be stored on disk.
DATED:		August 1987
---------------------------------------------------------------------
NAME:		NU-Prolog
VERSION:	1.1
SRC/MACHINE/OS:	C/UNIX on VAX, SUN, Perkin Elmer, Pyramid, Elxsi...
		 (portable to most UNIX systems)
AVAILABILITY:	Now, non-commercial.
COST:		$400 (Australian)
STATUS:		Development
FEATURES:	Quintus compatibility, database system, coroutines,
		 compiler
CONTACT:	John Shepherd
		(jas@mulga.oz.au, munnari!jas@seismo.css.gov.us)
		NU-Prolog Distribution
		Department of Computer Science
		University of Melbourne
		Parkville, Victoria 3052
		Australia
NOTES:
    Extra control facilities enable coroutining.  Predicates are
    delayed when insufficiently instantiated.  Good facilities for
    negation, quantifiers, implication, etc.  The database system
    allows terms containing functors and variables to be stored on
    disk.  Implementation is based on an extended version of WAM.
DATED:		August 1987
---------------------------------------------------------------------
NAME:		PARLOG
SRC/MACHINE/OS: C and PARLOG / Sun and VAX / 4.x UNIX
AVAILABILITY:	non-commercial
COST:		$300 or 150 Pounds per machine type.
FEATURES:
    Based on an abstract instruction set, the SPM
    (Sequential PARLOG Machine); SPM emulator written in
    C, PARLOG-SPM compiler written in PARLOG, interpreter
    written in PARLOG; fairly complete implementation of
    PARLOG, guards may contain any "safe" PARLOG conjunction,
    powerful metacall facility.
CONTACT:	Mrs. Pat Easton-Orr
		Department of Computing
		Imperial College of Science & Technology
		Huxley Building
		180 Queen's Gate
		London SW7 2BZ, England
		Phone: +44 1 589 5111
		ARPA:  parlog%doc.ic.ac.uk@seismo.arpa
		uucp:  ..!mcvax!ukc!icdoc!parlog
NOTES:	For a description of PARLOG, see the book "Parallel Logic
	Programming in PARLOG", by Steve Gregory.
DATED:		Jan 1988
---------------------------------------------------------------------
NAME:		Personal Prolog
SRC/MACHINE/OS: Macintosh
COST:		$64.95
CONTACT:	Optimized Systems Software
		1221 B Kentwood Avenue
		San Jose, CA 95129
		(408) 446-3099
NOTES:	See April 1987 issue of MacUser.
DATED:		Jan 1988
---------------------------------------------------------------------
NAME:		POPLOG
SRC/MACHINE/OS:	VAX (VMS/Ultrix and UNIX BSD), Sun-2, SUN-3,
		HP9000/200, HP9000/300, Apollo version with reduced
		features.
AVAILABILITY:	academic and commercial licenses
COST:		substantial educational discounts available.
STATUS:
    Development continuing. "Delivery" mechanism planned.  Being
    ported to other machines. Developed as part of software infra-
    structure for UK "Alvey Programme" in advanced IT.  Now
    marketed and supported internationally.
FEATURES:
    Mixed language development system, providing incremental
    compilers for DEC-10 Prolog, Common Lisp and POP-11 (like Lisp,
    but readable syntax, co-routines, etc.); routines written in C,
    Fortran and Ada may be linked dynamically into POPLOG
    environment and unlinked if necessary.  Integrated editor
    included. Window manager. Large number of online HELP, TEACH
    and Program library files.  Incremental compiler for Standard
    ML available optionally.  The languages all compile
    incrementally via a common virtual machine. So mixed language
    programming is supported, with shared data-structures.
    Tools provided for adding incremental compilers for new
    languages.  The Prolog is fast, but re-coding critical
    deterministic bits in POP-11 can achieve further speed-up.
    Object Oriented programming library included. Autoloading and
    search lists provide extreme tailorability, e.g. for teaching,
    or project libraries.
CONTACT:
    Academic users in USA and Canada:
	 Prof Robin Popplestone  (Also at University of Amherst)
	 Computable Functions Inc.,
	 35 South Orchard Drive,
	 Amherst, MA 01002, USA
	 tel (413) 253-7637
    Others
	 AI Business Centre
	 Systems Designers Plc,
	 Pembroke House,
	 Pembroke Broadway
	 Camberley, Surrey, GU15 3XD, England
	 Phone +44 (0)276 686200
    UK academic users:
	 Poplog Manager,
		 School of Cognitive Sciences
		 Sussex University
		 Falmer, Brighton BN1 9QN, England
NOTES:
    Poplog Version.13 with full Common Lisp, new Window Manager, and
    many enhancements will be released Oct/Nov 1987.  POPLOG is
    marketed under license from the University of Sussex.
DATED:		Sept 1987
---------------------------------------------------------------------
NAME:		Prolog-1
SRC/MACHINE/OS:	MS-DOS, CP/M, PDP-11 VAX, Macintosh
AVAILABILITY:	?
COST:		?
FEATURES:
    Standard syntax, ES/P expert system shell, 1KLIPS on VAX/VMS.
CONTACT:
    Expert Systems, International
    34 Alexandra Road			1150 First Avenue
    Oxford OX2 0DB			King of Prussia, PA 19406
    U.K.
NOTES:
    Plans to interface to RAPPORT relational database.  Teknowledge
    used this Prolog for their M.1 product.  See March 1985 issue
    of Dr. Dobb's Journal.
DATED:		March 1985
---------------------------------------------------------------------
NAME:		Prolog-2
SRC/MACHINE/OS: largely Prolog, CP/M-86, MS-DOS, RSX/RT/11; IBM-C
AVAILABILITY:	Academic and commercial.
COST:		Varies with license.
FEATURES:
    Fast interpreter; compiler for IBM-PC version only; DEC-10
    compatible syntax; source file editor, clause indexing, tail
    recursion optimization, virtual memory facility, debugger 
    (OR-gree), error handler, garbage collector, ability to overlay
    modules, windowing scheme, help facility.
CONTACT:	Expert Systems International, Ltd.
		same address as Prolog-1
NOTES:		Compiler/interpreter for VAX/VMS to be released
		early 1986.
DATED:		June 1985
---------------------------------------------------------------------
NAME:		Prolog-10 and Prolog-20
VERSION:	3.52 (Prolog-10), 1.5 (Prolog-20)
SRC/MACHINE/OS:	Prolog+Macro-10; TOPS-10 and TOPS-20
AVAILABILITY:	Academic and commercial licenses
STATUS:		stable, maintenance only
FEATURES:	Compiler and interpreter
CONTACT:	Quintus Computer Systems
		2345 Yale Street, Palo Alto, CA 94304
		(415)494-3612
NOTES:
    This version is vastly improved in comparison with the original
    Edinburgh system: an incremental compiler integrated with the
    interpreter producing tail-recursion optimized code, an
    interactive debugger and execution stepper for interpreted code,
    many other goodies; the TOPS-20 version runs in native mode and
    has a number of improvements over the TOPS-10 one
DATED:		July 1984
---------------------------------------------------------------------
NAME:		Prolog-86
VERSION:	2.01
SRC/MACHINE/OS:	MS-DOS, PC-DOS, CPM-86
COST:		$125
CONTACT:	Solution Systems
		335-D Washington Street
		Norwell, MA 02061
		(617) 659-1571
DATED:		March 1985
NOTES:		See March 1985 issue of Dr. Dobb's Journal.
---------------------------------------------------------------------
NAME:		Prolog-II
SRC/MACHINE/OS: Prolog, Pascal, Candide, Fortran; many operating systems.
AVAILABILITY:   Academic and commercial.
COST:		2500F to 15000F.
FEATURES:
    Portability on account of virtual machine, and interpreter and
    compiler; interactive clause development editor; unification to
    infinite trees; postponement of evaluation; new data structures;
    modularity as system of "worlds", tree structured rule space.
CONTACT:	M van Canegham
		PrologIA
		278 Rue St. Pierre
		13005 Marseille
		France
DATED:		June 1985
---------------------------------------------------------------------
NAME:		PROLOG/i, PROLOG/m
SRC/MACHINE/OS:	IBM PC (PROLOG/i) and Macintosh (PROLOG/m)
COST:		$69.95 PROLOG/i
		$99.95 PROLOG/m
CONTACT:	Chalcedony Software
		5580 La Jolla Blvd.
		Suite 126
		La Jolla, CA 92037
		(619) 483-8517
NOTES:		August 1986 issue of Computer Language, April 1987
		issue of Dr. Dobbs, March 1987 issue of MacUser.
DATED:		Jan 1988
---------------------------------------------------------------------
NAME:		Prolog-CRISS (formerly FOLL-Prolog)
VERSION:	3.1 dated 1985
SRC/MACHINE/OS: Pascal, HB68/MULTICS; ICL2900/VME/B; UNIX machine;
		VAX/VMS; PC/MS-DOS
AVAILABILITY:	Academic and commercial.
COST:		10000F, or 1000F for academic use.
FEATURES:
    Interpreter; cross-referencing between program identifiers,
    partial delay of program execution, intelligent backtracking,
    loop detection, definite clause grammar translation, database
    features, modularity on worlds.
CONTACT:	CRISS - BP 47X
		38040 Grenoble Cedex
		France
DATED:		June 1985
---------------------------------------------------------------------
NAME:		PROLOG/P
VERSION:	2.00
SRC/MACHINE/OS: Wide range of systems, including VAX/VMS and 68000
		machines.
AVAILABILITY:	Academic and commercial.
COST:		?
FEATURES:
    Interpreter written in Pascal, programming environment written
    in Prolog/P; possesses powerful yet portable features of Prolog
    language; interactive programming environment, flexible and
    extensible; modularity: can incorporate modules written in
    other languages; large number of evaluable predicates;
    optimized memory management, tail recursion, garbage collection.
    Speed: 1300 LIPS on VAX 750/VMS.
CONTACT:	Mr. Hentinger
		CRIL (Conception et Realisation Industriel de Logiciel)
		12 Bis, Rue Jean-Jaures
		92807 Puteaux
		France
		Tel: 776.34 37
DATED:		June 1985
---------------------------------------------------------------------
NAME:           Quintus Prolog
VERSIONS:       1.0 and 2.0
SRC/MACHINE/OS: Sun-2, Sun-3, Sun-4; VAX VMS, Ultrix, UNIX 4.3 BSD; 
		Apollo; Tektronix 4400; NCR Tower; IBM RT PC; 
		IBM 370 VM, MVS; Xerox 1100.
AVAILABILITY:   Supported commercial license, academic and multiple CPU
		discounts.
COST:           Call for pricing and general sales information
FEATURES:
    Incremental optimizing compiler with TRO and indexing; efficient
    use of memory; upwards compatible from DEC-10 Prolog and C-Prolog;
    Emacs interface with reconsulting/recompilation from editor buffers
    (Unipress Emacs license included); interfaces to other programming
    languages -- C, FORTRAN, Pascal and assembler on most UNIX systems;
    supported library including inter-process communication package.
    2.0 versions have modules, garbage-collection of the heap, indexing
    of dynamic (asserted) code.
    A number of additional products are also available:  (1) PAC
    (Prolog Application Compiler), which allows the building of stand
    alone applications for economical distribution, (2) ProWINDOWS, a
    high-level, object-oriented window system, and (3) high-level
    interfaces to Unify and Oracle databases.  All currently or
    imminently available on Suns; contact Quintus for availability on
    other platforms.
STATUS:         Continuing development; fully supported
CONTACT:        Don Hester
		Quintus Computer Systems, Inc.
		1310 Villa St, Mountain View, California 94041
		(415) 965-7700   ...!sun!quintus!hester
DATED:          December 1987
---------------------------------------------------------------------
NAME:           Rhet
VERSION:        14.x
SRC/MACHINE/OS: Common Lisp with extensions / Explorer 3.x and
		Symbolics 7.x
AVAILABILITY:	Full Sources are distributed to anyone, upon signing a
		license/disclaimer for non-commercial use.
COST:		$150 (academic), TR (user's manual) for $6.00, TR
	        (programmer's guide [for source hackers]) for $5.50.
	        Non-academic institutions are requested to send
	        whatever they can afford over $150 to help defray
	        expenses.
FEATURES:
    This is a Knowledge Representation system based on concepts
    proved with HORNE.  It includes 2 major modes for representing
    knowledge (as Horn Clauses or as frames), which are interchangable;
    a type subsystem for typed and type restricted objects (including
    variables); E-unification; negation; forward and backward chaining;
    complete proofs (prove, disprove, find the KB inconsistent, or
    claim a goal is neither provable nor disprovable); incremental
    compilation (next version); contextual reasoning; default reasoning
    (soon); truth maintenance; intelligent backtracking; full LISP
    compatibility (can call or be called by lisp); upward compatible with
    HORNE; user-declarable reasoning subsystems (soon); Allen & Koomen's
    TEMPOS time interval reasoning subsystem (soon); frames have KL-1 type
    features, plus arbitrary predicate restrictions on slots within a frame
    as well as default values for slots; separate subsystem providing
    advanced user-interface facilities, graphics, and ZMACS interface on the
    lispms.
CONTACT:
    Admin: (distribution and TRs) Rose Peet (rose@cs.rochester.edu)
    Technical:	Brad Miller (miller@cs.rochester.edu)
		James Allen (james@cs.rochester.edu)

		Computer Science Department
		University of Rochester
		Rochester, NY 14627
NOTES:
	The current version is essentially a pre-release, and is only
	recommended for those who can put up with beta-test level software.
        The code should be easier to port than HORNE (q.v.), however.
DATED:          April 1988
---------------------------------------------------------------------
NAME:		Salford University Prolog
SRC/MACHINE/OS:	Fortran 77, runs on Prime computers
COST:		$3500 for universities, $750 annual maint.
FEATURES:
    Edinburgh syntax; packaged with Salford Lisp; programs in one
    language can call programs in the other.
CONTACT:	Salford University Industrial Centre Limited
		Salford M5 4WT
		England

		 Or

		Mitchell Associates
		P.O. Box 6189
		San Rafael, CA
		(415) 435-2024
DATED:		June 1985
---------------------------------------------------------------------
NAME:		SB-Prolog (Stony Brook Prolog)
VERSION:	2.2.1
SRC/MACHINE/OS:
    C and UNIX. Assumes longwords need only be word-aligned, may not
    port easily to machines with stronger alignment requirements.
AVAILABILITY:
    FTP-able from Arizona, restrictions similar to GNU.  Login to
    arizona as anonymous, copy contents of the directory 'sbprolog'.
    Several files are in tar format, so ftp should be done in
    binary mode.
COST:		FREE!!
FEATURES:
    Based on the Warren Abstract Machine.  Allows arbitrary mixing of
    compiled (byte code) and interpreted code.  Provides user-directed
    goal caching; argument indexing in both compiled and interpreted
    code; CProlog-like trace/debug package; compilation to byte-code
    object files, with dynamic loading of undefined predicates.
CONTACT:	Saumya K. Debray (debray@arizona.edu)
		Department of Computer Science
		University of Arizona
		Tucson, Arizona 85721
		(602) 621-4527
DATED:		November 1987
---------------------------------------------------------------------
NAME:		Sicstus Prolog
SRC/MACHINE/OS:	C/Berkeley Unix
AVAILABILITY:	Commercial and non-commercial licenses.
STATUS:		Active development.
FEATURES:
    WAM based emulator, in-core & file-to-file compilers, interpreter,
    "4 port" debugger, dynamic interface to C functions, global stack
    garbage collector, ^C handler, cyclic term unifier, coroutines
    (dif and freeze), WAM level debugger. Tries to be Quintus
    compatible.
CONTACT:	Mats Carlsson
		SICS
		PO Box 1263
		S-16313 SPANGA, Sweden
		mats-c@sics.se
NOTES:
    Current version (0.5) lacks manual (being written).  Save/restore
    and native code compiler are being added.  20Klips on a SUN-3.
DATED:		August 1987
---------------------------------------------------------------------
NAME:		TI Prolog
VERSION:	2 (1987)
SRC/MACHINE/OS:	TI Prolog, Common Lisp, Explorer Microcode / 
		Explorer I and II
AVAILABILITY:	Educational, Commercial
COST:		??
STATUS:		Very stable and fully supported.
FEATURES:
    Incremental compiler, 100% compatible between compiled and
    interpreted code, Compatible with DEC-10/20 Prolog, incremental
    garbage collection, tail recursion optimization, DCG support;
    package (modularity) system; first and second level indexing;
    Lisp <=> Prolog interface; Zmacs Prolog mode; undefined predicate
    warning, Lisp error handling; "4 port" debugger and trace; reserved
    original variable's name; stream IO; full Lisp machine environment;
    good documentation.
CONTACT:	Texas Instruments Incorporated
		P.O. Box 809063
		Dallas, Texas 75380-9063
		or call 1-800-527-3500
NOTES:
    120K lips on an Explorer II and 42K lips on an Explorer I for naive
    reverse.  Fully-compatible to EDINBURGH Prolog, very easy to port.
    Widely used by various large projects.
DATED:		December 1987
---------------------------------------------------------------------
NAME:		Trilogy
VERSION:	Commercial version V1.0 released September 1987.
SRC/MACHINE/OS:	IBM-PC/XT/ATs or compatibles under DOS-2.1 or higher.
COST:		99.95 (US) + shipping/handling.
FEATURES:
    Constraint based logic prog. lang. It contains six different
    decision procedures. These include the full dec. proc. for the
    Presburger Arithmetic (arbitrarily quantified systems of linear
    equations and inequalities in integers). Trilogy also decides
    constraints involving finite mappings such as "a(x)=y" where all
    three variables can be solved for.  Because of the constraints
    Trilogy executes combinatorial problems involving arithmetic
    thousand times faster than Prologs.  Trilogy is fully based on
    the first order theory of S-exprs and it does not contain a single
    extralogical feature. Trilogy is an integrated language in that it
    contains 3G constructs (Pascal-like predicates and types) as well
    as 4G constructs (extensive dbase file operations).  Dbase files
    can be also queried in the 5G setting of predicate calls.  Trilogy
    comes with its own environment including online editor, native
    code compiler, linker, loader, and module librarian.
CONTACT:	Complete Logic Systems Inc.,
		741 Blueridge Ave, V7R 2J5,
		North Vancouver B.C.
		tel: (604) 986-3234.
DATED:		Sept 1987
---------------------------------------------------------------------
NAME:		UNH Prolog
VERSION:	1.3 (1985)
SRC/MACHINE/OS:	C, VAX/VMS and UNIX
AVAILABILITY:	Per machine license for all users
COST:		$300 handling charge for all users
STATUS:		Active
FEATURES:	Compatible with DEC-10/20 Prolog
CONTACT:	James L. Weiner/Wendy Fogg
		Department of Computer Science
		University of New Hampshire
		Durham, New Hampshire 03824
NOTES:
    Fully-compatible to EDINBURGH Prolog, with exception that some of
    the more obscure features are not implemented.  Debugging features
    of EDINBURGH Prolog also implemented.  Hooks into UNIX supported.
DATED:		Sept 1985
---------------------------------------------------------------------
NAME:		UNSW Prolog
VERSION:	4.2
SRC/MACHINE/OS:	C/Unix V7,32V,5.0,4.1BSD
AVAILABILITY:	Educational and research purposes only
COST:		A$100 in Australia,
		 US$150 elsewhere
FEATURES:
    Interpreter, enhanced UNIX interface Based on DEC-10 Prolog (not
    completely compatible)
CONTACT:	Claude Sammut
		(claude@cheops.eecs.unsw.oz
		 cheops.eecs.unsw.oz!claude@ukc)
		School of Electrical Engineering and Computer Science,
		University of New South Wales
		P.O. Box 1
		Kensington, N.S.W. 2033
		Australia
		Phone:	+61 2 697 4052
NOTES:
    Changes in version 4.2 include:
	 about 25% faster
	 real arithmetic
	 streams
	     Most i/o predicates take a stream as an optional first
	     argument.  These are Quintus like.
	 inter process communication facilities
	   * asynchronous processes may be started with streams to and
	     from the process optionally created
	   * A stream may be polled to see if it is ready to be read.
	   * In a BSD universe it is possible to do a select on a list
	     of streams. Select blocks for a given interval until one of
	     the supplied streams are ready. This stream is unified with
	     the last argument.
	 many bug fixes
	 a profiling facility that gives the user the ability to find out,
	 for each clause total calls, fails, exits, cputime, the number
	 of times each subgoal of the clause exits
DATED:		Sept 1987
---------------------------------------------------------------------
NAME:           Uranus System
SRC/MACHINE/OS: LISP/Dec 20, VAX/UNIX, Symbolics
AVAILABILITY:   Academic only
FEATURES:
    A superset of Prolog/KR (Prolog for Knowledge Representation).
    DEC 10 compatibility features; multiple worlds mechanism, lazy
    and pseudo parallel evaluation.
CONTACT:        Hideyuki Nakashima
		Information Processing Group
		Electrotechnical Laboratory
		Sakura-mura, Ibaraki 305, Japan
DATED:		Sept 1985
---------------------------------------------------------------------
NAME:		VM/Prolog, VS/Prolog
SRC/MACHINE/OS:	VM/CMS and MVS operating systems on high-end machines
AVAILABILITY:	?
COST:		?
CONTACT:	IBM, of course.  Program order numbers are
			 VM/Prolog: 5785-ABH
			 VS/Prolog: 5798-DYL
		 Documentation: SH20-6541 and SH40-0030, respectively.
FEATURES:
    Highly tailorable syntax; rich set of built-ins, including I/O,
    arithmetic, string handling; interfaces to relational databases
    DB2 and SEQUEL; interfaces to such IBM facilities as graphic
    terminal I/O, REXX and ISPF command language procedures and
    variables, shell commands, LISP/VM, XEDIT editor; labels, remote
    cuts, fails; axiom insertion/deletion at arbitrary locations;
    suspend/resume capability.
NOTES:	This entry from unofficial sources.  Check with IBM for the
	real details...
DATED:		Jan 1988
---------------------------------------------------------------------
NAME:    	VPI Prolog
SRC/MACHINE/OS:	Pascal, VAX with VMS.
AVAILABILITY:	Unrestricted.
COST:		$1000
FEATURES:
    Uses list allocation (9 byte cons) and syntax, double precision
    reals; facilities for interactive program development; interfaces
    to Lisp, Pascal and Fortran available, also general purpose expert
    system shell.
CONTACT:	Prof. John Roach,
		Dept. of Computer Science,
		Virginia Polytechnic Institute,
		Blacksburg, Va.
		(703) 961 5368
DATED:		February 1983
---------------------------------------------------------------------
NAME:		WProlog
SRC/MACHINE/OS:	IBM VM/370 CMS
FEATURES:	Very fast interpreter!
AVAILABILITY:	educational, commercial, third party
COST:		Yearly license, 50% academic discount
CONTACT:	WATCOM Products, Inc.
		415 Phillip Street
		Waterloo, Ontario
		Canada, N2L 3X2
		(519) 886-3700
DATED:		Sept 1987
---------------------------------------------------------------------
NAME:		York Portable Prolog
VERSION:	2
SRC/MACHINE/OS:	Pascal interpreter (ISO Standard Pascal)/ wide range
		 of systems that support Pascal.
AVAILABILITY: 	Educational, research etc.
COST: 		200 pounds sterling.
STATUS: 	Available now
FEATURES:
    Modeled after Edinburgh PDP-11 version; large number of
    built-in predicates; interactive debugging package written in
    Prolog; supports full Prolog syntax, with definite clause
    grammars, garbage collection of the Prolog database.
CONTACT: 	Mrs Jennifer Turner
		Software Technology Research Centre
		Department of Computer Science
		University of York
		York, YO1 5DD, U.K.
		(0904) 59861
DATED:		December 1984
---------------------------------------------------------------------
NAME:		ZYX Macintosh Prolog
VERSION:	(1 5)
SRC/MACHINE/OS:	Apple Macintosh Plus/SE/II;
		written in 68000 assembler, Prolog, and Pascal.
AVAILABILITY:	Commercial and academic license.
		Demo version available for $15 handling charge.
COST:		$575 (academic discounts available)
FEATURES:
    File compiler that compiles to machine code or bytecode. Development
    environment with editor windows, interpreter, and 4-port debugger.
    Z-Prolog dialect extensions include multiple name spaces, support for
    strings, pathnames, floating-point numbers, if-then-else, a powerful
    macro facility for meta-programming, generalized DCG, coroutines
    (freeze and dif). Close compatibility with HP Prolog. Full garbage
    collection, save/restore, Quickdraw interface, and a utility for
    creating Macintosh-style "pseudo-applications". Edinburgh (C-Prolog)
    compatibility package. Does 33 kLIPS on a Mac II.
STATUS:		Fully supported.
CONTACT:	Pia Kinhult (pk@zyx.se) or Jan-Erik Gustavsson (jeg@zyx.se)
		ZYX Sweden AB
		Styrmansgatan 6
		S-114 54 Stockholm, Sweden
		+46 (8) 665 32 05
NOTES:		Pre-release of version (2 4) being distributed now,
		featuring a faster and better interpreter.
DATED:		January 1988
---------------------------------------------------------------------
---------------------------------------------------------------------
-- 
				Hans Burg
				Vrije Universiteit
				Amsterdam, Holland
				e-mail : jfmburg@cs.vu.nl