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FAQ: Scheme Implementations and Mailing Lists 2/2 [Monthly posting]

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This post contains part 2 of the Scheme FAQ.

If you think of questions that are appropriate for this FAQ, or would
like to improve an answer, please send email to us at

Topics Covered (Part 2):
  [2-1]   Free Scheme implementations.
  [2-2]   Commercial Scheme implementations.
  [2-3]   What Scheme-related discussion groups and mailing lists exist?

Search for \[#\] to get to question number # quickly.

Subject: [2-1] Free Scheme implementations. Repositories of Scheme source code are described in the answer to question [1-9]. Remember, when ftping compressed or compacted files (.Z, .z, .arc, .fit, etc.) to use binary mode for retrieving the files. Files that end with a .z suffix were compressed with the patent-free gzip (no relation to zip). Source for gzip is available from: as the files gzip-1.2.4.shar, gzip-1.2.4.tar,or gzip-1.2.4.msdos.exe. Repositories of Scheme implementations: Many free Scheme implementations are available from []. See also the Scheme Repository described below. The Scheme Repository contains a Scheme bibliography, copies of the R4RS report, sample Scheme code for a variety of purposes, several utilities, and most free implementations. (Implementations of Scheme available from the repository include elk, gambit, scm, fools, rabbit, s48, scheme84, scheme88, pseudo, xscheme, umb-scheme, siod, vscm, and pixiescheme.) The repository was established by Ozan S. Yigit and is currently maintained by David Eby and John Zuckerman <>. The repository is accessible by anonymous ftp at [] The repository is mirrored in INRIA, courtesy of Christian Queinnec [Ecole Polytechnique and INRIA-Rocquencourt], (See also [1-9].) Scheme implementations: BIGLOO is a Scheme interpreter and compiler. It conforms to the IEEE-Scheme standard (IEEE P1178) with some extensions, such as regular expression parsing (RGC), a lexical analyzer generator, a full foreign function interface, and a pattern matching compiler. Bigloo can also compile modules written in Caml (an ML dialect), letting you mix Scheme, ML, and C. Object-oriented programming is provided by Meroon v3. The main goal of Bigloo is to deliver small and fast stand alone applications. Bigloo produces ANSI C and hence should be easy to port. It runs on Sparc (1, 2, 10), SONY-NEWS (MIPS R3000), IRIS Indigo (MIPS R3000), Sun 3/60, DecStation 3100, PC-486 (linux), and HP-PA (730). It is available by anonymous ftp from [] as the files bigloo1.7.tar.gz and camloo0.2.tar.gz. For further information, send email to, or write to Manuel Serrano (equipe ICSLA, Bat 8), INRIA-Rocquencourt, BP 105, 78153, Le Chesnay CEDEX, FRANCE, or call 39-63-57-32. Elk (Extension Language Kit) has been designed specifically as an embeddable, reusable extension language subsystem for applications written in C or C++. Elk is also useful as a stand-alone Scheme implementation, in particular as a platform for rapid prototyping of X11-based Scheme programs. Elk was first published in 1989; the current version is Elk 3.0. The Elk distribution includes a Scheme interpreter (embeddable and stand-alone versions), several dynamically loadable extensions, run-time support (including a top-level implemented in Scheme and a debugger), and 230+ pages of documentation (troff and PostScript format). Major features of Elk are incremental, dynamic loading of compiled extensions (supported on many platforms); freezing of the interpreter or application into a new executable file; a C/C++ programmer's interface for language interoperability; Scheme bindings for X11 Xlib, Xt, Athena and Motif Widgets; a UNIX interface (not restricted to POSIX); bitstrings, records, and regular expressions; a stop-and-copy and an incremental, generational garbage collector. The Elk 3.0 distribution and more information about Elk are available in the World Wide Web at The distribution is also available on a number of FTP sites including For more information contact Oliver Laumann <>. FDU Scheme is a R3RS implementation of Scheme for the Prime 50-series under Primos. It is available by anonymous ftp from [] (username "anonymous", password <RETURN>). Attach to the Scheme subdirectory (cd '*>scheme') and transfer all files in it and its subdirectories using file type binary. For more information, contact Peter Falley, <>. Fools' Lisp is a small Scheme interpreter that is R4RS conformant, and is available by anonymous ftp from [] Fools' Lisp runs on Sun3 and Sun4 (SunOs), DecStation 3100s, Vax (Ultrix), Sequent, and Apollo. Implemented by Jonathan Lee <>. Gambit is a high-performance implementation of Scheme based on an optimizing compiler. It conforms to the IEEE-Scheme standard (IEEE P1178) and the Revised^4 Report on Scheme (R4RS) and supports the whole numeric tower (i.e. integer, rational, real and complex numbers). Gambit extends the standards by providing: weak pairs, wills, string ports, records, property lists, namespaces, futures, pretty printer, debugger, multitasking, and compiler declarations. To make it portable and simplify bootstrapping, the compiler is written in IEEE-Scheme and makes use of a high-level abstract-machine (called GVM) for the intermediate representation. A "Scheme-in-Scheme" approach was adopted to minimize the amount of non-portable code in the system (nearly all of the runtime library is written in Scheme including the interpreter and debugger). Three different variants of Gambit were produced: Gambit-68K (first public release in 1990; last version: 2.0, june 1993): This is the original Gambit system with a native code back-end for Motorola 680x0. It works on most 68K based Unix workstations and on the BBN GP1000 shared-memory multiprocessor. The back-end for the GP1000 implements Multilisp's "future" parallel construct using lazy-task-creation (a very low overhead task spawning mechanism). MacGambit (first public release in 1991; last version: 2.2.2, oct 1995): This is a port of Gambit-68K for the Macintosh. It is a complete development environment, including a Scheme-aware editor, an online help system, and a linker to build standalone applications. A drawing window for simple graphics and an interface to many of the Macintosh's "Toolbox" routines are available. An executable MacGambit application is supplied with the distribution as well as all the sources (ThinkC 4.0 or CodeWarrior 6 or higher are needed to recompile the sources). Gambit-C (first public release in 1994; last version: 2.3.1, april 1996): In this variant of Gambit, the compiler generates highly portable C code that is reasonably efficient. The primary goals of Gambit-C are portability and correctness (in particular it correctly implements tail-recursion across modules and uses a precise garbage-collector). Gambit-C runs on a wide range of Unix workstations, on Macintosh, and DOS/Windows. It also supports these features: dynamic-loading of compiled files, C-interface (FFI), and a memory management system that expands and contracts the heap based on the program's needs. Standalone executables can be created with Gambit-C (a minimal application is about 700 Kbytes when statically linked and 5 Kbytes when the runtime system is compiled as a shared-library). Sources: Executables for Windows-95 and Windows-NT: Executables for DOS and Windows 3.1: Gambit can be used freely for non-commercial uses (including academic research and education). A license is required to use Gambit commercially (contact HELP (a lazy Scheme) is available by anonymous ftp from Written by Thomas Schiex (, Help is a complete and efficient Scheme-like functional lazy Lisp interpreter. It works only on 68020 (or more) based Macintoshes. It has a 'friendly' interface (parenthesis matcher, auto-indent), uses a full call-by-need semantics and includes many examples, including a symbolic compiler for the 680x0. Efficiency is good and lazyness is fully parametrizable (you may turn Help into a strict Scheme-like language if you like). French AND English updated docs are included in Word4 and plain text formats. LIBSCHEME is a C library implementing Scheme as described in R4RS. It is easily integrated into a C program as a command interpreter or extension language, and is easily extended in C with new primitive types, primitve functions and syntax. It should be portable to most machines with an ANSI C compiler. It is available by anonymous ftp from For more information, write to Brent Benson <>. MIT Scheme (aka C-Scheme), is available free by anonymous FTP from [] or Version 7.3 is a beta version and runs on DEC Alpha, DECStation (MIPS), HP 9000 300/400/700, IBM RS-6000, Intel i386/i486 (DOS, NT, Windows 3.1, or Linux), NeXT (NeXTOS 2 or 3), SGI (MIPS), Sony NEWS (MIPS), Sun3 (SunOS 4.1) and Sun4 (SunOS 4.1). Bugs should be reported to (for the DOS version, send bug reports to MIT Scheme includes Edwin (Scheme's Emacs-like editor) and Liar (the Scheme compiler). Does not have a convenient foreign function interface yet. FTP distribution includes MIT C-Scheme Reference and User manuals, as well as the Revised^4 Report on Scheme. Discussion occurs on the newsgroup comp.lang.scheme.c (gatewayed to the mailing list For DOS floppy distribution requests (includes printed copies of manuals), send $95.00 (payable in U.S. funds to "Scheme Distribution") to cover costs of distribution to Scheme Distribution, c/o Prof. Hal Abelson, 545 Technology Sq. rm 410, Cambridge MA 02139, USA. | On the NeXT, MIT Scheme is available as part of the Schematik package, which provides an editor/front-end user interface, graphics, and "robotics" support for Lego and the like. Schematik is free and is available for anonymous ftp from Europeans can get it more locally from start with Schematik- . Schematik is also apparently included on NeXT's "Educational Software Sampler" CD-ROM. | A preliminary unofficial port of C-Scheme to the Linux is available from Contact the author Matteo Frigo <> for more information. MzScheme is a Scheme implementation for Unix, Windows (Win32), and MacOS. In addition to supporting standard R4RS Scheme (including the full numerical tower), MzScheme provides pre-emptive threads, generative record datatypes, an exception system (integrated with all primitive errors), classes and objects, first-class compilation units, regular expression parsing, and simple TCP support on all platforms. MzScheme can dynamically load extensions implemented in C, and it can be embedded into any C/C++ application. Interoperability with C is facilitated by the use of a conservative garbage collector. MzScheme is the core interpreter for MrEd, an engine for developing portable GUI applications for X Windows, Windows, and MacOS. DrScheme (currently under development, using MzScheme/MrEd) will incorporate project management, debugging, and modular analysis to provide a complete Scheme development environment for pedagogical and professional use. For information and online documentation for MzScheme, MrEd, and DrScheme, see Oaklisp is an seamless integration of Scheme with an object-oriented substrate. Available by anonymous ftp from [] or from and includes reference and implementation manuals. Written by Barak Pearlmutter <> and Kevin Lang <>. PC-Scheme (aka PCScheme, PC Scheme) is an implementation of Scheme originally written by Texas Instruments. TI made a version of the source code freely distributable in 1987. TI stopped supporting the code, and some researchers at the University of Geneva produced a cleaned-up version (see PCS/Geneva below). On July 13, 1992, Ibuki announced that it had purchased the rights to PC Scheme from TI. Please see the Ibuki PC Scheme entry in [2-2]. If you want a high-quality and supported implementation of PC Scheme, buy the Ibuki implementation. It is certainly inexpensive enough. Now TI PC-Scheme is available by anonymous ftp from and runs on MS-DOS 286/386 IBM PCs and compatibles. Version 3.3 should run on the 486, but no guarantees. Version 3.3 is the last free version. TI PC-Scheme conforms to the Revised^3 Report on Scheme. It includes an optimizing compiler, an emacs-like editor, inspector, debugger, performance testing, foreign function interface, window system and an object-oriented subsystem. It also supports the dialect used in Abelson and Sussman's SICP. PCS/Geneva is a cleaned-up version of Texas Instrument's PC Scheme developed at the University of Geneva. The main extensions to PC Scheme are 486 support, BGI graphics, LIM-EMS pagination support, line editing, mouse support, assembly-level interfacing, and several powerful Scheme-oriented editors. (TI's PC Scheme gives users full Revised^3 support along with many primitives for DOS, Graphics and Text Windows. A powerful built-in optimizing compiler produces fast code.) PCS/Geneva 4.02PL1 has been tested on XTs, ATs, AT386s and AT486s under various DOS and OS/2 versions. It even runs on Hewlett-Packard's HP95LX. It also runs on Suns with a DOS emulator. PCS/Geneva is available free by anonymous ftp from [] as the files pcscheme.doc, pcscheme.exe, pcscheme.fil and pcscheme.taz or by email (uuencoded) from If you ftp PCS/Geneva, please send mail to; the authors like to know their public and will inform you when a new release is available. This is also the email address for bug reports or if you need any kind of help. This product may be distributed freely and used without restrictions except for military purposes. (PCS/Geneva was developed by Larry Bartholdi <> and Marc Vuilleumier <>.) Pixie Scheme for the Macintosh is a nearly complete implementation of R3RS available by anonymous ftp from Pixie.Goodies.SIT.bin PixieScheme.NoFPP.SIT.bin ; for macs without floating-point coprocessor PixieScheme.SIT.bin ; for macs with FPP Pixie_Scheme_Help.SIT.bin Pixie_intro Written by Jay Reynolds Freeman <freeman@MasPar.COM>, P. O. Box 60628, Palo Alto, CA, 94306-0628. A copy may also be obtained from /afs/ as the file pixiescheme.cpt.hqx if your site runs the Andrew File System, or by anonymous ftp from Scheme->C is an R4RS compliant Scheme system that is centered around a compiler that compiles Scheme to C. Besides the base language, the system includes "expansion passing style" macros, a foreign function call capability, records, weak pointers, 3 X11 interfaces, call/cc, and a generational, conservative, copying garbage collector. The result is a system that is portable, efficient, and able to build applications that contain a mix of compiled and interpreted Scheme, and compiled code from C, C++ and other languages. The current release of Scheme->C runs on the following systems: Digital Alpha AXP systems with OSF/1, MIPS based DECstations, VAXen with ULTRIX, MIPS based SGI systems, PC's running Microsoft Windows 3.1, Apple Macintosh's running system 7.1, HP 9000/300, HP 9000/700, Sony News, Harris Nighthawk and other m88k systems, linux, Sun SPARC, and NT (Visual C++ compiler). Earlier releases also run on Sun3, DNx500, DN1000, 386's running Unix, DNx500, and DN1000 systems. The software is available for anonymous ftp from [] There are three interfaces to X11, all written in Scheme, available from gatekeeper. The first is a complete set of stubs to Xlib included in the base system. The second is an alternative to Xlib called SCIX, found in The third, ezd, allows programs to easily produce interactive, structured graphics and is found in Those without ftp access can also obtain Scheme->C and ezd from the Prime Time Freeware CD, Vol. 1, No. 2. Additional information is available from the author at Digital Equipment Corporation's Western Research Lab: Joel Bartlett, Scheme 48 is a Scheme implementation based on a virtual machine architecture. Scheme 48 is designed to be straightforward, flexible, reliable, and fast. It should be easily portable to 32-bit byte-addressed machines that have POSIX and ANSI C support. In addition to the usual Scheme built-in procedures and a development environment, library software includes support for hygienic macros (as described in the Revised^4 Scheme report), multitasking, records, exception handling, hash tables, arrays, weak pointers, and FORMAT. Scheme 48 implements and exploits an experimental module system loosely derived from Standard ML and Scheme Xerox. The development environment supports interactive changes to modules and interfaces. A beta release of Scheme 48 is available by anonymous ftp from For more information, contact Richard Kelsey and Jonathan Rees at <>. Scsh is a Unix shell/systems programming environment implemented on top of Scheme 48 (a portable, byte-code compiled R4RS Scheme implementation). Scsh provides - A high-level macro notation for writing typical shell-script computations: running programs, pipelines, I/O redirection, and so forth. For example, to decompress a file and mail it to someone, you might say (run (| (gzcat home.html.gz) (mail -h "Here's my home page" To spell check your paper, printing out the results, you could say: (run (| (delatex (< paper.tex)) (spell) (lpr -Ppulp))) - A complete system-call interface to Unix: fork, exec, I/O, file system, time, env vars, and so forth. The I/O interface includes a *complete* interface to BSD sockets, both Unix and TCP/IP domains. I/O is completely integrated with Scheme ports. System calls return useful values, not error codes; errors are reported by raising exceptions which can be caught by handlers. - Other useful shell-programming utilities: filename globbing/pattern matching, regexp matching, macros for writing AWK-like programs, field and record parsers, and so forth. - The ability to write executable shell scripts using the Unix #! interpreter feature, with access to command-line argv values. These features are completely integrated into Scheme 48's R4RS Scheme implementation; the programming language is Scheme. The scsh release is self-contained -- it comes with its own complete Scheme 48 implementation. Scsh currently runs on the following platforms: DEC Ultrix, Harris NightHawk, HP-UX, IBM AIX, Linux, NetBSD/i386, NeXTSTEP/Intel, SGI IRIX, Solaris, and SunOS. It's not hard to port scsh to new systems. | You can get a copy of scsh via anonymous ftp, from the following: These tar files include a detailed manual and a paper describing the design of the system. For the lazily curious, we also have the manual separately available as Scsh has been implemented by the Scheme Underground For further information, contact Olin Shivers <>, SCM, free by anonymous ftp from Current version 4e1. Runs on Amiga, Atari-ST, MacOS, MS-DOS, OS/2, NOS/VE, VMS, Unix and similar systems. SCM conforms to the Revised^4 Report on the Algorithmic Language Scheme and the IEEE P1178 specification. Scm is written in C. ASCII and EBCDIC are supported. Written by Aubrey Jaffer. To receive an IBM PC floppy disk with the source files and MSDOS and i386 executables send $99 to Aubrey Jaffer, 84 Pleasant Street, Wakefield MA 01880, <>. SLIB (Standard Scheme Library) is a portable Scheme library which is intended to provide compatability and utility functions for all standard Scheme implementations, including SCM, Chez, Elk, Gambit, MacScheme, MITScheme, scheme->C, Scheme48, T3.1, and VSCM, and is available as the file slib2a0.tar.gz. Written by Aubrey Jaffer. JACAL is a symbolic math system written in Scheme, and is available as the file jacal1a4.tar.gz. SCMCONFIG contains additional files for the SCM distribution to build SCM on Unix machines using GNU autoconf. SLIB-PSD is a portable debugger for Scheme (requires emacs editor). TURTLSCM is a turtle graphics package which works with SCM on MSDOS or X11 machines. Written by Mkinen Sami <> and Jarkko Leppanen <>, it is available as the file turtlegr.tar.Z. (Also available from as turtlegr.tar.gz, along with an already-compiled MSDOS binary of scm with turtlegraphics and slib in XSCM is an X Windows interface to Xlib and the Motif and OpenLook toolkits for the SCM interpreter. It requires scm4a10 or later. It should be available at any archive of alt.sources, or on swiss-ftp, prep and indiana as the file xscm1.05.tar.Z. Contact for more information. SMG-SCM is a package that adds VMS SMG screen management routines to SCM. It is available from swiss-ftp, prep and indiana as the file (A VMS version of Unzip is available by anonymous FTP from[ANONYMOUS.MACRO32]UNZIP.EXE.) This file contains the source code, documentation, and example code. Send comments and bugs to T. Kurt Bond, <> (preferred) or <>. WB is a disk based, sorted associative array C library (database). These associative arrays consist of variable length (less that 256 bytes) keys and values. WB comes with an interface to SCM. Basic operations are creation, destruction, opening and closing of diskfiles and arrays, insertion, deletion, retrieval, successor, and predecessor (with respect to dictionary order of keys). Functional application of find-next, deletion, and modification over a range of consecutive key values is supported. Multiple associative arrays can be stored in one disk file. Simultaneous access to multiple disk files is supported. A structure checker, garbage collector are included. A repair program and ram-disk type file (for temporary structures) are in developement. The current WB implementation has a file size limit of 2^32 * block size (default 2048) = 2^43 bytes (8796 Gbytes). WB does its own memory and disk management. WB is available on swiss-ftp, prep, and indiana as wb1a1.tar.z. A Windows version of Scheme called WinScm is forthcoming from Vincent Manis of Langara College of BC, Canada. Hobbit is a Scheme-to-C compiler that works with the SCM Scheme interpreter. It treats SCM as a C library and integrates compiled functions into SCM as new primitives. Hobbit release 2 works with SCM release 4b4. Future releases of SCM and Hobbit will be coordinated. Hobbit imposes strong restrictions on the higher-order features of Scheme. For example, it does not support continuations. The main aim of hobbit is to produce maximally fast C programs which would retain most of the original Scheme program structure, making the output C program readable and modifiable. Hobbit is written in Scheme and is able to self-compile. Hobbit can be obtained via anonymous ftp from For further information, contact the author, Tanel Tammet, at <> or at Tanel Tammet, Department of Computer Sciences, Chalmers University of Technology, S-41296 Go"teborg, Sweden. Similix is a Self-Applicable Partial Evaluator for a Subset of Scheme. Written by Anders Bondorf, Olivier Danvy, and Jesper J{\o}rgensen. It is available by anonymous ftp from as similix.tar.Z or from For more information, contact Anders Bondorf, DIKU, Department of Computer Science, University of Copenhagen, Universitetsparken 1, DK-2100 Copenhagen, Denmark, or send email to Similix conforms to the IEEE and R4RS standards, but also runs under R3RS Scheme. It runs in SCM, Chez Scheme and T3.1. SIOD (Scheme in One Defun), free by anonymous ftp from or in any comp.sources.unix archive. Runs on VAX/VMS, VAX UNIX, Sun3, Sun4, Amiga, Macintosh, MIPS, Cray, Windows NT/WIN32. Small scheme implementation in C arranged as a set of subroutines that can be called from any main program for the purpose of introducing an interpreted extension language. Compiles to ~42K bytes of executable. Lisp calls C and C calls Lisp transparently. Version 3.0 includes support for manipulation of Oracle and Digital RDB relational databases (SQL interface). Written by George Carrette <> or <>. STk is a R4RS Scheme interpreter which can access the Tk graphical package. All of the commands defined by the Tk toolkit are available to the STk interpreter, and Tk variables are reflected back into Scheme as Scheme variables. Callback is expressed in Scheme. Includes a CLOS-like OO extension called STklos, which provides multiple inheritance, generic functions, multi methods, and a true meta-object protocol. A set of classes have been defined to manipulate Tk commands (menu, buttons, scales, canvas, canvas items) as Scheme objects. STk runs on Sparc (SUNOS 4.1.x), Dec 5xxx (Ultrix 4.2), SGI (Irix 4.05, 5.1.1), DEC Alpha, and Linux 1.0. STk is available by anonymous ftp from [] Please send bug reports, comments, and questions to Erick Gallesio, <>, Universite de Nice - Sophia Antipolis, ESSI - I3S Route des colles, BP 145, 06903 Sophia Antipolis CEDEX, FRANCE, phone (33) 92-96-51-53, fax (33) 92-96-51-55. To subscribe to the mailing list, send a message with subscribe in the Subject field to T3.1 is a Scheme-like language developed at Yale. Available by anonymous ftp from T may be obtained in Europe from Runs on DecStations (MIPS processor) and SGI Iris, Sun4 (SPARC), Sun3, Vax/Unix. Includes a copy of the online version of the T manual and release notes for T3.0 and T3.1. All implementations include a foreign function (C) interface. To be informed of fixes, new releases, etc., send your email address to Bug reports should go to A multiprocessing version of T (for Encore Multimax) is available from [The sources were last modified November 22, 1991.] UMB Scheme is a R4RS Scheme available by anonymous ftp from and also in the Scheme Repository. It includes a simple editor, debugger, Written by William Campbell, University of Massachusetts at Boston, VSCM is a R4RS Scheme available by anonymous ftp from the Scheme Repository, [] Written by Matthias Blume, <>. The implementation is based on a virtual machine design with heavy support for most of the sophisticated features of Scheme. The virtual machine is written in ANSI-C to aid in its portability. The bytecode compiler is written in Scheme itself. Documentation of VSCM is also available as XScheme is available free by anonymous ftp from It includes an object system and is R3RS compliant. It was written by David Michael Betz, 167 Villa Avenue #11, Los Gatos, CA 95032, 408-354-9303 (H), 408-862-6325 (W), XScheme is discussed in the newsgroup comp.lang.lisp.x. It may also be found in the Scheme Repository. Free Scheme Implementations implemented in Lisp: Peter Norvig's book "Paradigms of AI Programming" has a chapters about Scheme interpreters and compilers, both written in Common Lisp. The software from the book is available by anonymous ftp from and on disk in Macintosh or DOS format from the publisher, Morgan Kaufmann. For more information, contact: Morgan Kaufmann, Dept. P1, 2929 Campus Drive, Suite 260, San Mateo CA 94403, or call Toll free tel: (800) 745-7323; FAX: (415) 578-0672 PseudoScheme is available free by anonymous ftp from It is Scheme implemented on top of Common Lisp, and runs in Lucid, Symbolics CL, VAX Lisp under VMS, and Explorer CL. It should be easy to port to other Lisps. It was written by Jonathan Rees (, Send mail to to be put on a mailing list for announcements. Conforms to R4RS except for lacking a correct implementation of call/cc. It works by running the Scheme code through a preprocessor, which generates Common Lisp code. Scheme84 is in the public domain, and available by mail from Indiana University. It runs on the VAX in Franz Lisp under either VMS or BSD Unix. To receive a copy, send a tape and return postage to: Scheme84 Distribution, Nancy Garrett, c/o Dan Friedman, Department of Computer Science, Indiana University, Bloomington, Indiana. Call 1-812-335-9770 or send mail to for more information. It will also run in Jeff Dalton's port of Franz Lisp to Net/Free/386BSD on 386-like machines. (See the Lisp FAQ for information on Franz Lisp.) Scheme84 is available by anonymous FTP from Scheme88 is available by anonymous ftp from and also from the Scheme Repository.
Subject: [2-2] Commercial Scheme implementations. Chez Scheme: Chez Scheme Version 5 is a high-performance implementation of Scheme conforming to the IEEE/ANSI Scheme Standard and the R4RS. Chez Scheme provides an incremental optimizing compiler, complete run-time library, generation-based garbage collector, interactive inspector, and C interface. New Version 5 features include improved performance, lexical macros, multiple values, shared incremental heaps, guardians and weak pairs, and generic ports. Version 5 is available for Sparc SunOS and Solaris, Alpha OSF/1, SGI IRIX 5.X, Motorola mc88000 SVR3/4, 80386 NeXT Mach, BSDI BSD/386, and Linux. More information on Chez Scheme can be obtained via anomymous ftp from Site license fees start at $9000 ($4500 academic). We are not able to handle personal sales at this time. For detailed pricing and ordering information contact or Kent Dybvig at Cadence Research Systems, 3814 Devonshire South, Bloomington, IN 47408-9698, USA. Phone 812-333-9269, fax 812-332-4688. EdScheme, WinScheme Editor, 3DScheme, "The Schemer's Guide", and "The Schemer's Guide to C++": Schemers Inc. publishes software and textbooks that promote the use and advancement of Scheme in the educational and commercial sectors. Their products include: + The WinScheme Editor v2.0. This is a Windows full-featured MDI (Multiple Document Interface) editor for Scheme programs. It knows about Scheme syntax and contains comprehensive code formatting facilities. It provides a channel for sending programs direct to Windows-based Scheme interpreters, allowing users to develop, test, and edit Scheme code from within the editor. The WinScheme Editor also includes a substantial set of context-sensitive online documentation for the programming environment and the Scheme language. The WinScheme Editor requires MS Windows 3.1 or later (with Win32s), Windows 95 or Windows NT with 2MB RAM and 3MB hard disk space. The retail price for the WinScheme Editor is $89.95. + EdScheme for Windows v4.2a. This is an R4RS-compatible Windows-based Scheme interpreter. It is seamlessly integrated into the WinScheme Editor and provides a fully customizable transcript window that journals Scheme sessions and serves as a command window. EdScheme can be customized by specifying a load-path, a start-up file of library procedures, and setting its level of Windows multi-tasking tolerance. EdScheme for Windows includes a turtle graphics interface, Windows API access for creating windows, dialogs, and interacting with the mouse, and an integrated debugging facility. EdScheme for Windows is a 32-bit application that requires MS Windows 3.1 or later (with Win32s), Windows 95 or Windows NT with 4MB RAM and 4MB of hard disk space. The retail price for EdScheme for Windows is $129.95. (Note: The WinScheme Editor is integrated into EdScheme and does not need to be ordered separately.) + 3DScheme for Windows v1.3. This is a Windows-based R4RS Scheme interpreter incorporating over 550 geometrical Scheme primitives that access Spatial Technology Inc's ACIS (R) Geometric Modeling Kernel, the de facto industry standard in 3D modeling. The 3D modeling features include: - construction of solid bodies from blocks, cylinders, cone frustums, spheres, and toruses. - construction of wire-bodies from straight, circular, elliptical, Bezier, and spline edges. - construction of solids by extruding planar faces or profiles along a vector or revolving about an axis. - application of rigid transformations, uniform scaling, and boolean operations. - intersect, trim, fillet, and chain edges. - simultaneous views of solids from several different angles. - dynamically accepted event-driven input for picking, rubber banding, or dragging. - rendering of solids using flat or Gouraud technology and configurable refinements, materials, texture spaces, and render lights. - saving and loading collections of solid and wire entities from disk in .sat format. - outputting rendered images as high resolution bitmaps or Postscript files. As with EdScheme for Windows, 3DScheme is seamlessly integrated with the WinScheme Editor. 3DScheme also ships with the "Getting Started with ACIS 3D Toolkit Using Scheme" book which is described below. 3DScheme is a 32-bit application that requires MS Windows 3.1 or later (with Win32s), Windows 95 or Windows NT with 8MB RAM and 16MB of hard disk space. A 3DScheme demo program is available from the Scheme repository in the "promo" directory or may be requested from Schemers Inc. 3DScheme for Windows retails for $495 (call for academic discount). (Note: The WinScheme Editor is integrated into 3DScheme and does not need to be ordered separately.) + EdScheme for Macintosh v4.0. This is an R4RS-compatible Macintosh-based Scheme interpreter. The programming environment takes advantage of the capabilities of the Macintosh computer. Its user interface includes a full-featured integrated editor, with special capabilities such as parenthesis-matching, program formatting, file indexing, and template editing. In addition, customized transcript and debugging windows featuring colored and styled text are provided. The interpreter features a powerful and comprehensive turtle graphics interface, unlimited precision "bignum" integral and rational/complex number arithmetic, file handling facilities, and language extensions using macros and transformers. EdScheme for Macintosh runs from floppy or hard drive and requires a Mac Plus or later, System 6.0.4 or better, and 2MB RAM. EdScheme for Macintosh retails for $59.95. + EdScheme for DOS v3.4. This is a DOS-based Scheme interpreter that incorporates a large subset of R4RS. EdScheme for DOS features an integrated editor with automatic parenthesis-matching, a turtle graphics interface, debugging facility, comprehensive file-handling capabilities, macros and more. It runs from floppy or hard drive and requires MS DOS 3.3 or later and 512KB RAM. EdScheme for DOS retails for $49.95. + "The Schemer's Guide - Second Edition" by Iain Ferguson with Edward Martin and Burt Kaufman. Foreword by Daniel Friedman. (1995--346pp.--Paper--ISBN 0-9628745-2-3) The Schemer's Guide presents the elements of modern computer programming in an easy-to-follow and entertaining manner. The book introduces students to the Scheme programming language, guiding them through such concepts as functional programming, recursion, data structures, higher order functions, delayed evaluation, and object-oriented programming. The Schemer's Guide concludes with a significant game-playing project involving artificial intelligence. The book strikes a good balance between theory and practice, while nurturing good programming practices. The Schemer's Guide has a proven track record of several years use in teaching the art of Scheme programming to high school students and college undergraduates. A comprehensive teacher's guide and an additional set of resource materials including worksheets, quizzes, projects, and exams are available to instructors using this text. The retail price of the book is $35.95. (A Spanish translation of "The Schemer's Guide" is available.) + "The Schemer's Guide to C++" by Iain Ferguson (1996--92 pp.--Paper--ISBN 1-888579-11-0) The Schemer's Guide to C++ builds on the solid theoretical foundation provided by an increasing number of courses--such as those based on the introductory textbook, The Schemer's Guide--that introduce the principles of modern computer science via the Scheme language. From this basis it provides students with a fundamental, pratical working knowledge of the programming language C++. The author uses his experience as a full-time, commercial programming professional to lead students step by step from the elegant principles of high level programming with which they are already familiar to the nitty-gritty of C++, but without ever losing sight of the computer science fundamentals that underlie good programming practice. As in "The Schemer's Guide", students quickly learn to write complete, non-trivial programs, including the design and implementation of a modern container class library. This unashamedly practical course is perfect for students and teachers who seek a clear, direct, fast-track path to learning C++. The retail price of the book is $17.95. + "Getting Started with ACIS 3D Toolkit Using Scheme" by Edward Martin. (1995--260pp.--Paper--ISBN 0-9628745-1-5) This Getting Started book includes all you need to know about Scheme, mathematics, and solid modeling to become a skilled 3D modeler using 3DScheme or the ACIS 3D Toolkit. The retail price for the book is $35.95, but is included free with 3DScheme for Windows. For more information about these products, write to Schemers Inc., 2136 NE 68th Street, Suite 401, Fort Lauderdale, FL 33308, call 954-776-7376, or fax 954-776-6174. You can also send EMail to Schemers' European distributor, Lambda Publications, is reachable by phone at 44-793-695296 or by EMail on Gambit Scheme requires a license for commercial users. See the entry in [2-1] for details. Ibuki PC Scheme: Ibuki PC Scheme 5.01 is a modern, up-to-date implementation of TI PC-Scheme (see [2-1]). Ibuki purchased the rights to TI PC Scheme on July 13, 1992. Ibuki PC Scheme runs under DOS on all IBM compatible PCs, including 486s, and can use up to 4mb of extended memory. It will also run under Windows 3.1. For more information, contact IBUKI, 340 Second Street, PO Box 1627, Los Altos, CA 94022, phone (415) 961-4996, fax (415) 961-8016, email Richar Weyhrauch <>. Ibuki has a special pricing program for schools teaching Scheme in courses. Inlab-Scheme: Inlab-Scheme is an independent implementation of the algorithmic language Scheme as defined by the R4RS and the IEEE Standard 1178. In addition to the language core Inlab-Scheme has support for bitmap/greymap processing of several kinds. Inlab-Scheme can be used as a general tool for image processing, OCR or specialized optical object and pattern recognition. Inlab-Scheme is distributed at <>, where additional information about the current state of the project, supported platforms, current license fees and more is available. MacScheme: MacScheme is a Scheme interpreter and compiler for the Apple Macintosh, and includes an editor, debugger and object system. MacScheme costs $125 (includes compiler) and Scheme Express costs $70 (interpreter only). It requires 1mb RAM. A development environment (MacScheme+Toolsmith) costs $495. Conforms to the Revised^4 Report on the Algorithmic Language Scheme. MacScheme+Toolsmith includes support for menus, windows, and interfaces to the Macintosh Toolbox, and can create small standalone Macintosh executables. Implemented by Will Clinger, John Ulrich, Liz Heller and Eric Ost. Write to: Lightship Software, PO Box 1636, Beaverton, OR 97075, or call (503) 292-8765. They're moving to California. The temporary phone number is 415-940-4008 (Liz Heller). The new phone number will be 415-694-7799, or fax bug reports to 415-694-7705 or 800-441-5015. MacScheme is distributed by Academic Computing Specialists (ACS), 2015 East 3300 South, Salt Lake City, UT 84109-2630, 1-800-531-3227 or 1-800-552-1601 (801-484-3923), fax 801-467-2200. These products may also be purchased from Academic Computing Specialists, PO Box 711, Dewey, AZ 86327, tel 602-632-7176, fax 602-632-7631.
Subject: [2-3] What Scheme-related discussion groups and mailing lists exist? Before posting to any discussion group, please read the rest of this FAQ, to make sure your question isn't already answered. See the Lisp FAQ for a list of Lisp-related discussion groups and mailing lists. We list here only those newsgroups and mailing lists directly associated with Scheme. Newsgroups: comp.lang.scheme General Scheme-related discussion. This newsgroup is available in digest fromat as part of the Scheme Digest comp.lang.scheme.c Discussion of C-Scheme, a scheme dialect more commonly known as "MIT Scheme". This newsgroup is gatewayed to the mailing list. comp.lang.scheme.scsh Discussion of Scsh, the ``Scheme Shell'', a UNIX shell/systems programming environment implemented on top of Scheme 48 (a portable, byte-code compiled R4RS Scheme implementation). This newsgroup is gatewayed to the mailing list. comp.lang.lisp.x Discussion of XLISP, a dialect of Lisp, and XScheme. comp.lang.dylan Discussion of Dylan (see [4-6]), Apple's new Scheme-like programming language. Gatewayed to We list several mailing lists below. In general, to be added to a mailing list, send mail to the "-request" version of the address. This avoids flooding the mailing list with annoying and trivial administrative requests. [To subscribe to info-mcl, info-dylan, or other mailing lists based at, send a message to with "subscribe <list_name>" in the message body. Likewise use "unsubscribe <list_name>" to cancel your subscription and "help" to get help.] General Scheme Mailing Lists: Discussion of Scheme. Gatewayed to the comp.lang.scheme newsgroup. General discussion about Scheme. Particular Flavors of Scheme:, C-Scheme. Gatewayed to the comp.lang.scheme.c newsgroup. T, a dialect of Scheme. PseudoScheme Dylan (not really scheme, but) ---------------------------------------------------------------- ;;; *EOF*

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