Editing Logo (programming language) (section)

== Implementations ==
{{anchor|DrLogo}} <!--The page Dr. Logo redirects here-->
{{Redirect|Apple Logo|the logo of Apple Inc.|Apple logo}}
[[File:IBM LCSI Logo Welcome Screen.png|thumb|IBM LCSI Logo welcome screen]]
[[File:IBM LCSI Logo Circles.png|thumb|Source code and output in IBM LCSI Logo]]

Some modern derivatives of Logo allow thousands of independently moving turtles. There are two popular implementations: [[Massachusetts Institute of Technology]]'s [[StarLogo]] and [[Northwestern University]] Center for Connected Learning's (CCL) [[NetLogo]]. They allow exploring [[emergence|emergent phenomena]] and come with many experiments in social studies, biology, physics, and other areas. NetLogo is widely used in agent-based simulation in the biological and social sciences.

Although there is no agreed-upon standard, there is a broad consensus on core aspects of the language. In March 2020, there were counted 308 implementations and dialects of Logo, each with its own strengths.<ref>{{cite web |url=https://pavel.it.fmi.uni-sofia.bg/logotree/pdf/LogoTree.pdf |title=The Logo Tree Project |website=elica.net |url-status=dead |archive-url=https://web.archive.org/web/20090306084150/http://elica.net/download/papers/LogoTreeProject.pdf |archive-date=2009-03-06 |access-date=2020-03-25 }}</ref> Most of those 308 are no longer in wide use, but many are still under development. Commercial implementations widely used in schools include ''[[MicroWorlds]] Logo'' and ''Imagine Logo''.

Legacy and current implementations include:

; First released in 1980s:
* Apple Logo for the [[Apple II Plus]] and Apple Logo Writer for the [[Apple IIe]], developed by Logo Computer Systems, Inc. (LCSI), were the most broadly used and prevalent early implementations of Logo that peaked in the early to mid-1980s.
* Aquarius LOGO was released in 1982 on cartridge by [[Mattel]] for the [[Mattel Aquarius|Aquarius]] home computer.
* [[Atari Logo]], developed by LCSI, was released on cartridge by [[Atari Inc|Atari, Inc.]] in 1983 for the [[Atari 8-bit computers]].
* Color Logo was released in 1983 on cartridge (26–2722) and disk (26–2721) by [[Tandy Corporation|Tandy]] for the [[TRS-80 Color Computer]].
* Commodore Logo was released, with the subtitle "A Language for Learning", by [[Commodore International]]. It was based on MIT Logo and enhanced by Terrapin, Inc. The [[Commodore 64]] version (C64105) was released on diskette in 1983; the [[Commodore Plus/4|Plus/4]] version (T263001) was released on cartridge in 1984.<ref>{{cite web |url=http://www.zimmers.net/commie/docs/cbm-products.txt |title=Canonical List of Commodore Products |date=2017-10-30 |access-date=2017-12-03 |last1=Brain |first1=Jim |last2=Zimmerman |first2=Bo |url-status=live |archive-url=https://web.archive.org/web/20171220005631/http://www.zimmers.net/commie/docs/cbm-products.txt |archive-date=2017-12-20 }}</ref><ref>{{cite web |url=http://plus4world.powweb.com/software/Logo |title=Logo – Software Details |website=Plus/4 World |access-date=2017-12-03 |url-status=live |archive-url=https://web.archive.org/web/20171204171250/http://plus4world.powweb.com/software/Logo |archive-date=2017-12-04 }}</ref>
* SmartLOGO was released on cassette by [[Coleco]] for the [[Coleco ADAM|ADAM]] home computer in 1984.  It was developed by LCSI and included a primer, ''Turtle Talk'', by Seymour Papert.
* ExperLogo was released in 1985 on diskette by Expertelligence Inc. for the [[Macintosh 128K]].
* Hot-Logo was released in the mid-1980s by EPCOM for the [[MSX]] 8-bit computers with its own set of commands in Brazilian Portuguese.
* TI Logo (for the [[TI-99/4A]] computer) was used in primary schools, emphasizing Logo's usefulness in teaching computing fundamentals to novice programmers.
* Sprite Logo, also developed by Logo Computer Systems Inc., had ten turtles that could run as independent processes. It ran on Apple II computers, with the aid of a Sprite Card inserted in one of the computer's slots.
* IBM marketed their own version of Logo (P/N 6024076), developed jointly by Logo Computer Systems, Inc. (LCSI), for their then-new IBM PC.
* [[ObjectLOGO]] is a variant of Logo with [[object-oriented programming]] extensions and lexical scoping. Version 2.7 was sold by Digitool, Inc.<ref>[http://www.digitool.com/ol-specs.html Object Logo] {{webarchive|url=https://web.archive.org/web/20080430083030/http://www.digitool.com/ol-specs.html |date=2008-04-30 }} page on the Digitool website (accessed 4 March 2008)</ref>  It is no longer being developed or supported, and does not run on versions of the Mac operating system later than 7.5.<ref>[http://www.digitool.com/ol-purchase.html Object Logo ordering page] on the Digitool website (accessed 4 March 2008)</ref>
* Dr. Logo was developed by [[Digital Research]] and distributed with computers including the [[IBM PCjr]],<ref name="DRI_1984_MicroNotes2"/> Atari ST and the [[Amstrad CPC]].<ref>{{Cite web|url=https://www.computerhistory.org/collections/search/|title=Catalog Search &#124; Computer History Museum|website=www.computerhistory.org}}</ref><ref>{{Cite web|url=https://www.computinghistory.org.uk/det/2666/Amstrad-CPC-6128/|title=Amstrad CPC 6128 - Computer - Computing History|website=www.computinghistory.org.uk}}</ref><ref>{{Cite web|url=https://www.habisoft.com/pcwwiki/doku.php?id=es:manual_del_amstrad_pcw_8256_8512_ingl%C3%A9s|title=es:manual_del_amstrad_pcw_8256_8512_ingles [PcwWiki]|website=www.habisoft.com}}</ref>{{anchor|DrLogo}}<!--The page Dr. Logo redirects here-->
* [[Acornsoft Logo]] was released in 1985. It is a commercial implementation of Logo for the 8-bit [[BBC Micro]] and [[Acorn Electron]] computers.<ref name="field">{{cite book | title=LOGO on the BBC computer and Acorn Electron | publisher=[[Macmillan Publishers|Macmillan]] | author=Field, Graham | year=1985 | isbn=0-333-39566-2}}</ref> It was developed for [[Acorn Computers]] as a full implementation of Logo. It features multiple screen [[turtle (robot)|turtle]]s and four-channel sound. It was provided on two 16kB [[Read-only memory|ROMs]], with utilities and [[device driver|driver]]s as accompanying software.<ref name="tmu four logos">{{cite news | url=http://www.nostalgia8.nl/logo/docs/mudeel1.jpg | title=Four Logos for the BBC Micro | publisher=[[The Micro User]] | work=The Micro User Education Special | access-date=February 20, 2012 | author=Radburn, Derek}}</ref>
*Lego Logo is a version of Logo that can manipulate robotic [[Lego]] bricks attached to a computer.<ref>{{cite journal|journal=[[Communications of the ACM]]|volume=36|number=7|date=July 1993|first=Mitchel|last=Resnick|title=Behavior Construction Kits|pages=64–71|doi=10.1145/159544.159593|s2cid=9263998|url=https://web.media.mit.edu/~mres/papers/BCK/BCK.html|accessdate=5 January 2022|doi-access=free}}</ref> It was implemented on the [[Apple II]] and used in American and other grade schools in the late 1980s and early 1990s.<ref>{{cite web|url=http://www.ucls.uchicago.edu/students/projects/1994-95/Lego-Logo/ProjectDescription.html|archiveurl=https://web.archive.org/web/20110720072907/http://www.ucls.uchicago.edu/students/projects/1994-95/Lego-Logo/ProjectDescription.html |archivedate=20 July 2011|title=The Laboratory Schools LEGO-LOGO Project|website=[[University of Chicago Laboratory Schools]]}}</ref> Lego Logo is a precursor to [[Scratch (programming language)|Scratch]].<ref>{{citation|last1=Bull|first1=G.|last2=Garofalo|first2=J.|last3=Hguyen|first3=N.|year=2020|title=Thinking about computational thinking: Origins of computational thinking in educational computing|journal=Journal of Digital Learning in Teacher Education|volume=36|number=1|pages=6–18|doi=10.1080/21532974.2019.1694381|s2cid=214563715}}</ref>

; First released in 1990s:
* In February 1990, ''Electron User'' published Timothy Grantham's simple implementation of Logo for the [[Acorn Electron]] under the article "Talking Turtle".<ref>{{cite web|url=http://www.acornelectron.co.uk/mags/eu/ills/7_05/s-p20.jpg|title=Talking Turtle|date=February 1990|pages=20–21|archiveurl=https://web.archive.org/web/20170328011620/http://www.acornelectron.co.uk/mags/eu/ills/7_05/s-p20.jpg |archivedate=28 March 2017}}</ref>
* Comenius Logo is an implementation of Logo developed by [[Comenius University Faculty of Mathematics, Physics and Informatics|Comenius University Faculty of Mathematics and Physics]]. It started development in December 1991, and is also known in other countries as SuperLogo, MultiLogo and MegaLogo.<ref>{{Cite web |date=2002-12-09 |title=History of Comenius Logo |url=http://www.input.sk/slogo/history.htm |access-date=2022-10-12 |archive-url=https://web.archive.org/web/20021209200055/http://www.input.sk/slogo/history.htm |archive-date=2002-12-09 }}</ref>
* [[UCBLogo]], also known as Berkeley Logo, is a free, cross-platform implementation of standard Logo last released in 2009. George Mills at MIT used UCBLogo as the basis for [[MSWLogo]] which is more refined and also free. Jim Muller wrote a book, ''The Great Logo Adventure'', which was a complete Logo manual and which used MSWLogo as the demonstration language.<ref>{{cite web|url=https://softronix.com/logo.html|accessdate=5 January 2022|title=MSWLogo, An Educational programming language|first=Jim|last=Muller|date=November 2001}}</ref> MSWLogo has evolved into [[FMSLogo]].

; First released from 2000 onwards:
* aUCBLogo is a rewrite and enhancement of [[UCBLogo]].
* Imagine Logo is a successor of Comenius Logo, implemented in 2000.<ref>{{Cite book |last=Andrej |first=Kalas |url=https://worldcat.org/oclc/854959806 |title=Imagine... a new generation of Logo : programmable pictures |last2=Blaho |first2=Ivan |year=2000 |oclc=854959806}}</ref> The English version was released by Logotron Ltd. in 2001.<ref>{{Cite web |date=2001-04-17 |title=Imagine {{!}} Press Release |url=http://logo.com/press_releases/imagine/index.html |access-date=2022-10-12 |archive-url=https://web.archive.org/web/20010417020957/http://logo.com/press_releases/imagine/index.html |archive-date=2001-04-17 }}</ref>
* [[LibreLogo]] is an extension to some versions of LibreOffice. Released in 2012, it is written in [[Python (programming language)|Python]]. It allows vector graphics to be written in Writer.
* Logo3D is a tridimensional version of Logo.
* POOL is a dialect of Logo with object-oriented extensions, implemented in 2014. POOL programs are compiled and run in the graphical IDE on [[Microsoft Windows]]. A simplified, cross-platform environment is available for systems supporting [[.NET Framework]].
* QLogo is an open-source and cross-platform rewrite of [[UCBLogo]] with nearly full UCB compatibility that uses hardware-accelerated graphics.
* Lynx is an online version of Logo developed by Logo Computer Systems Inc. It can run a large number of turtles, supports animation, parallel processes, colour and collision detection.
* LogoMor is an open-source online 3D Logo interpreter based on JavaScript and p5.js. It supports 3D drawings, animations, multimedia, 3D models and various tools. It also includes a fully-featured code editor based on [[CodeMirror]]
* LbyM is an open-source online Logo interpreter based on JavaScript, created and actively developed (as of 2021) for [[Sonoma State University]]'s ''Learning by Making'' program.<ref>{{cite web|url=https://make.sonoma.edu/learning-making|title=Learning by Making ¦ Make@SSU|date=14 August 2017|accessdate=8 January 2022}}</ref> It features traditional Logo programming, connectivity with a customized microcontroller and integration with a modern code editor.