View source for System 6

{{Short description|Sixth major release of the classic Mac OS}}
{{About|the sixth major release of the classic Apple Macintosh operating system|
|}}
{{Infobox OS version
| name = 
| version of = [[classic Mac OS]]
| family=[[Mac operating systems|Macintosh]]
| logo=
| screenshot = Macintosh system 6.0.8.png
| caption = System 6.0.8
| developer=[[Apple Inc.|Apple Computer]]
| source_model=[[Closed source]]
| license=Proprietary
| kernel_type = [[Monolithic kernel|Monolithic]]
| first_release_date={{Start date and age|1988|04}}
| release_version=6.0.8
| release_date={{Start date and age|1991|05}}
| release_url={{webarchive|url=https://web.archive.org/web/20020812062805/http://docs.info.apple.com/article.html?artnum=15582|date=August 12, 2002|title=Macintosh: System Software Version History}}
| preceded_by=[[Classic Mac OS#System Software 5|System 5]]
| succeeded_by=[[System 7]]
| support_status=Historical, unsupported
}}
{{Classic Mac OS sidebar}}
'''System 6''' (or '''System Software 6''') is the sixth major release of the [[classic Mac OS]] [[operating system]] for [[Mac (computer)|Macintosh]] computers, made by [[Apple Inc.|Apple Computer]]. It was released in 1988. It is a [[monolithic system|monolithic]] operating system, with [[cooperative multitasking]] based on an improved [[MultiFinder]]. The boxed version cost {{US$|49|1988|about=yes|round=-1}}, and it was included with all new Macintosh computers until 1991, when it was succeeded by [[System 7]].<ref name="macuser">{{Cite magazine |last=Paden |first=Jake |date=November 1988 |title=Now we are six (System Software 6.0 for the Macintosh) |magazine=[[MacUser]] |pages=184}}</ref>

==Overview==

===MacroMaker===
The MacroMaker utility was introduced in System 6.<ref name="newfeatures">{{Cite magazine |last=Forbes |first=Jim |date=April 12, 1988 |title=Apple to enhance system software, desktop database. |magazine=[[eWeek|PC Week]] |pages=11}}</ref> It records mouse and keyboard input as [[Macro (computer science)|macro]]s, and has a unique user interface intended to look and act like a [[tape recorder]].<ref name="macromaker">{{Cite magazine |last=Beaver |first=David |date=July 19, 1988 |title=Some simpler solutions to making macros (MacroMaker and AutoMac III macro recorders for the Macintosh) |magazine=[[MacWEEK]] |pages=44}}</ref> MacroMaker was criticized for its lack of features when compared to [[Microsoft]]'s AutoMac III, which was already available commercially. As MacroMaker records only the locations of mouse-clicks inside windows and not what is being clicked on or exactly when, it can not be used to automate actions in more sophisticated programs. The pre-recorded clicks miss buttons if the buttons had moved since the recording, or if they failed to appear upon playback.<ref name="macromaker"/> It records the start and end locations of mouse movements, but does not track the precise path of a movement or support pauses.<ref name="inside-the-apple-mac_pg333-334">{{Cite book |last1=Heid |first1=Jim |url=https://archive.org/details/mac_Inside_the_Apple_Macintosh_-_Held_Norton_1989 |title=Inside the Apple Macintosh |last2=Norton |first2=Peter |publisher=[[Simon & Schuster, Inc.]] |year=1989 |isbn=0-13-467622-X |series=The Peter Norton Foundation series |pages=[https://archive.org/details/mac_Inside_the_Apple_Macintosh_-_Held_Norton_1989/page/n340 333]–334 |author-link2=Peter Norton}}</ref> MacroMaker is not compatible with [[System 7]], in which it is succeeded by [[AppleScript]].{{Citation needed|date=March 2022}}

===Multitasking===
Macintosh gained cooperative multitasking in March 1985 with [[Andy Hertzfeld]]'s Switcher, which can switch between multiple full-screen applications.<ref>{{Cite book |last=Hertzfeld |first=Andy |title=Revolution in the Valley |publisher=[[O'Reilly Media|O'Reilly]] |year=2005 |isbn=0-596-00719-1 |pages=243–251}}</ref> It was not integrated, and was only sold separately by Apple. Not many programs and features function correctly with Switcher, and it does not share the screen between applications simultaneously. Systems 5 and 6 have [[MultiFinder]] instead,<ref name=":0">{{Cite magazine |last=Wiggins |first=Robert R. |date=March 1988 |title=All systems go (System Tools 5.0 with MultiFinder) |magazine=MacUser |pages=126}}</ref> which is much more mature and widely used in System 6. With MultiFinder, the Finder does not quit to free resources, and the system behaves as in the still-familiar multitasking fashion, with the desktop and other applications' windows in the background.<ref>{{Cite web |date=September 1, 1987 |title=Apple Talks About Multifinder |url=https://www.savetz.com/ku/ku/applelink_apple_talks_about_multifinder_september_1987.html |access-date=December 2, 2024 |website=Known Users}}</ref>

===Hardware support===
System 6 includes support for the Apple [[ImageWriter LQ]] and [[PostScript]] [[Laser printing|laser printers]]. New [[software driver]]s allow the ImageWriter LQ to be used on [[AppleTalk]] local area networks and supports the use of [[Tabloid (paper size)|tabloid]] or B-size paper ({{convert|11|x|17|in|mm|abbr=on|disp=or}}). System 6 includes QuickerGraf (originally QuickerDraw), system software used to accelerate the drawing of color images on the [[Macintosh II]]. It was licensed to Apple and [[Radius Inc.]] by its programmer, Andy Hertzfeld.<ref name="newfeatures"/>

===Limitations===
In comparison to the [[NeXTSTEP]] operating system of the time, System 6 does not make much use of sound, and its user interface is limited in file management and window displays.<ref name="revamp"/> System 6's [[Apple menu]] cannot be used to launch applications. The icon in the upper right-hand corner of the [[menu bar]] simply shows the open application and is not a menu.<ref>{{Cite magazine |last=LeVitus |first=Bob |date=July 1991 |title=System 7.0: 10 reasons why you'll love it |magazine=Computer Shopper |pages=202}}</ref> System 6 supports 24&nbsp;[[bit]]s of addressable [[Random-access memory|RAM]] (random-access memory), which allows for a maximum of 8&nbsp;[[megabyte]]s of RAM, with no provision for [[virtual memory]].<ref name="memory">{{Cite magazine |date=August 1991 |title=Settling down with System 7 (Apple Macintosh operating system's compatibility with network operating systems and upgrading benefits) |magazine=The Local Area Network Magazine |pages=18}}</ref> These limitations were removed in System 7. System 6's version of the [[Hierarchical File System (Apple)|HFS]] file system also has a [[Volume (computing)|volume]] size limit; it supports up to 2&nbsp;[[gigabyte]]s (GB) and 65,536 files on any one volume. System 7.5 increased this limit to 4&nbsp;GB, and 7.5.2 increased it further to 2&nbsp;TB on certain machines, specifically PCI-based Macintosh models.<ref>{{Cite web |date=January 17, 2007 |title=Macintosh: File System Specifications and Terms |url=http://docs.info.apple.com/article.html?artnum=8647 |archive-url=https://web.archive.org/web/20080508023713/http://docs.info.apple.com/article.html?artnum=8647 |archive-date=May 8, 2008 |access-date=March 9, 2019 |publisher=[[Apple Inc]]}}</ref>

The Trash (known as the "Wastebasket" in the British-English version) empties when the Finder terminates.<ref>{{cite web |last=Panic |first=Major General |date=August 1, 2006 |title=trash can |url=https://everything2.com/title/trash+can |access-date=December 2, 2024 |website=Everything2.com}}</ref> Icons on the Desktop in System 6 are not organized into a single folder, as in later operating systems. Instead, the system records if a file is on the Desktop.<ref>{{Cite magazine |last=LeVitus |first=Bob |date=March 1992 |title=Top ten secrets of System 7 (Beating the System) |magazine=MacUser |pages=213}}</ref> This is inefficient and confusing, as the user cannot browse to the Desktop in applications besides the Finder, even within the standard ''Open'' and ''Save As'' dialog boxes. Furthermore, these dialogs are primitive, and were mostly unchanged since 1984. The lack of [[alias (Mac OS)|alias]]es, shortcuts to files, is another limitation of file management on System 6,<ref>{{Cite magazine |last=Michel |first=Steve |date=May 14, 1991 |title=Aliasing: a file by any other name. (making duplicate files with minimal disk space) (System 7.0 Survival Guide) |magazine=MacWEEK |pages=S13}}</ref> and custom file and folder icons are not supported. These issues were all remedied in System 7.<ref>{{Cite web |last=Knight |first=Daniel |date=February 19, 2001 |title=Not the End of the Mac as We Know It |url=https://lowendmac.com/musings/end.html |access-date=December 2, 2024 |website=Low End Mac}}</ref>

A maximum of 15 desk accessories may be installed at one time, including the Chooser, Scrapbook, and Control Panel.<ref>{{Cite magazine |date=March 1, 1988 |title=Font/DA Juggler Plus |magazine=MacUser |pages=27 |quote=Now you can break the Macintosh barrier of 15 DAs, 200 fonts, and 8 FKeys.}}</ref><ref>{{Cite magazine |last=Aker |first=Sharon Zardetto |date=May 1, 1988 |title=DAs of Our Lives |pages=203 |magazine=MacUser |quote=Then came hard disks and megaRAMs, and a System update that included scrolling menus. That basically solved the font problem, but there was still a System limitation of 15 "slots" in the Apple menu for accessories.}}</ref> System 6 uses the Control Panel desk accessory to access all the installed control panels, which imposes severe user-interface limitations. In System 7, Control Panels are contained in separately openable panels, and are held in a central folder for better organization.<ref>{{Cite book |last=Everson |first=Sharon |url=https://archive.org/details/insidemacintoshm00appl/ |title=Inside Macintosh: More Macintosh Toolbox (Apple Technical Library) |date=October 1992 |publisher=[[Addison-Wesley]] |isbn=0-201-63243-8 |pages=7–41 |format=PDF |url-access=registration}}</ref> Desk Accessories cannot be installed or removed within the Finder; this requires the Font/DA Mover utility. System 7 also fixed this.<ref>{{Cite book |last=Everson |first=Sharon |url=https://archive.org/details/insidemacintoshm00appl/ |title=Inside Macintosh: More Macintosh Toolbox (Apple Technical Library) |date=October 1992 |publisher=[[Addison-Wesley]] |isbn=0-201-63243-8 |pages=7–37 |format=PDF |url-access=registration}}</ref>

The interface is not very customizable. The Finder allows each icon to be assigned a color, but the desktop background is limited to an 8x8-pixel color tiled pattern (color patterns were introduced in System 5),<ref>{{Cite magazine |last=Wiggins |first=Robert R. |date=March 1, 1988 |title=All systems go. (Software Review) (System Tools 5.0 with MultiFinder.) |magazine=MacUser |quote=Many of the cdev modules that come with System Tools 5.0 are for the Macintosh II, including a new one called "Color" that allows you to change the highlight color, the color used as a background when text or an icon is selected. The General cdev also adds the ability to set the desktop pattern color on a Macintosh II.}}</ref> and standard window frames are black-and-white. However, many "[[Extension (Mac OS)#The INIT mechanism|INIT]]" extension files exist to add color and customization.<ref>{{Cite magazine |date=March 1990 |title=Color Icons |url=https://www.wap.org/journal/showcase/washingtonapplepijournal1990v12no3mar90.pdf |url-status=live |magazine=Washington Apple Pi |volume=12 |issue=3 |page=86 |archive-url=https://web.archive.org/web/20210919083909/https://wap.org/journal/showcase/washingtonapplepijournal1990v12no3mar90.pdf |archive-date=2021-09-19 |access-date=2022-05-13}}</ref> System 7 allows the user to change the color of window frames and various other aspects of the user interface.<ref name="revamp">{{Cite magazine |last=Crabb |first=Don |date=June 1989 |title=The Mac Interface: Showing Its Age |magazine=[[Byte (magazine)|Byte]] |pages=235–237}}</ref> By 1989, the System 6 user interface was in need of a change.<ref name="revamp"/>

==Reception==
Initial releases of System 6 are unstable; Don Crabb of ''[[BYTE (magazine)|BYTE]]'' described 6.0 as "buggy and unreliable".<ref name="crabb198902">{{Cite magazine |last=Crabb |first=Don |date=February 1989 |title=Hey Apple, I Need a Laptop |url=https://archive.org/details/eu_BYTE-1989-02_OCR/page/n205/mode/2up?view=theater |access-date=2024-10-08 |magazine=BYTE |pages=151–154}}</ref> Many [[Third party developer|third-party developers]] did not receive advance copies, resulting in widespread compatibility issues.<ref name="macuser"/> The contemporary versions of many common programs such as [[Microsoft Excel]], [[Microsoft Works]] and [[4th Dimension (software)|4th Dimension]] were not fully compatible with System 6.<ref name="macuser"/> There were also software bugs in the Color Manager, Script Manager, and Sound Manager [[Extension (Mac OS)|extension]] files. Apple announced that 66 bugs were fixed with version 6.0.1 update, in September 1988.<ref>{{Cite magazine |date=September 13, 1988 |title=System 6.0.1 set for distribution |magazine=MacWEEK}}</ref><ref name="saga">{{Cite magazine |last=Perrow |first=Jonathan |date=September 20, 1988 |title=System 6.0 saga not over yet |magazine=MacWEEK |pages=2}}</ref> However, a major bug involving the text-spacing of screen fonts was found, and was fixed in version 6.0.2,<ref name="saga"/> which Crabb described as "a ''huge'' improvement" over 6.0.{{r|crabb198902}} Some customers waited longer until moving to System 6 because of its poor reputation.<ref>{{Cite magazine |date=October 25, 1988 |title=Managers go slow with System 6.0.2 |magazine=MacWEEK |pages=2}}</ref>

==Compatibility==
System 6 was officially supported by Apple for many different machines, some of which shipped with it. Some unsupported Macintosh computers can run it with limitations.<ref name="versionmatrix"/><ref name="PowerBook100">{{Cite web |date=November 30, 1994 |title=PowerBook & Macintosh Classic II: No Support for System 6 |url=http://docs.info.apple.com/article.html?artnum=9140 |url-status=dead |archive-url=https://web.archive.org/web/20120426172351/http://docs.info.apple.com/article.html?artnum=9140 |archive-date=April 26, 2012 |access-date=May 3, 2008 |publisher=[[Apple Inc]]}}</ref>

{| border=1 cellpadding=1 cellspacing=0 style="font-size: 85%; border: gray solid 1px; border-collapse: collapse; text-align: center"

|-
! style="background:#ececec; width:100px"|Macintosh Model
! style="background:#ececec; width:100px"|Model Date
! style="background:#ececec; width:110px"|6.0.8<ref name="versionmatrix">{{Cite web |date=September 10, 1997 |title=System Software: Version Matrix, System 6.0.x to 7.0.1 |url=http://docs.info.apple.com/article.html?artnum=18046 |url-status=dead |archive-url=https://web.archive.org/web/20020617204047/http://docs.info.apple.com/article.html?artnum=18046 |archive-date=June 17, 2002 |access-date=March 12, 2022 |publisher=[[Apple Inc]]}}</ref>
! style="background:#ececec; width:110px"|6.0.7<ref name="versionmatrix"/>
! style="background:#ececec; width:110px"|6.0.5<ref name="versionmatrix"/>
! style="background:#ececec; width:110px"|6.0.4<ref name="versionmatrix"/>
! style="background:#ececec; width:110px"|6.0.3<ref name="versionmatrix"/>
! style="background:#ececec; width:110px"|6.0.2<ref name="versionmatrix"/>

|-
! style="background:#ececec" | [[Macintosh 128K|128K]]
| rowspan=2 |1984
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[Macintosh 512K|512K]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[Macintosh 512Ke|512Ke]]
| 1986
| {{yes}}<ref name="512Ke">{{Cite web |date=March 14, 2002 |title=Macintosh 512Ke: Technical Specifications |url=http://docs.info.apple.com/article.html?artnum=112166 |url-status=dead |archive-url=https://web.archive.org/web/20020817201011/http://docs.info.apple.com/article.html?artnum=112166 |archive-date=August 17, 2002 |access-date=March 12, 2022 |publisher=[[Apple Inc]]}}</ref> 
| {{yes}}<ref name="512Ke"/>
| {{yes}}<ref name="512Ke"/>
| {{yes}}<ref name="512Ke"/>
| {{yes}}<ref name="512Ke"/>
| {{yes}}<ref name="512Ke"/>

|-
! style="background:#ececec" | [[Macintosh XL]]
| 1985
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[Macintosh Plus|Plus]]
| 1986
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
! style="background:#ececec" | [[Macintosh SE|SE]]
| 1987
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
! style="background:#ececec" | [[Macintosh SE/30|SE/30]]
| 1989
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}

|-
! style="background:#ececec" | [[Macintosh Classic|Classic]]
| 1990
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}<ref name="ClassicROM">{{Cite web |date=November 19, 1990 |title=The System in the New Machine |url=http://www.tidbits.com/tb-issues/TidBITS-031.html#lnk1 |url-status=dead |archive-url=https://web.archive.org/web/20080503173021/http://www.tidbits.com/tb-issues/TidBITS-031.html#lnk1 |archive-date=May 3, 2008 |access-date=May 4, 2008 |publisher=TidBITS Publishing Inc.}}</ref>
| {{no}}

|-
! style="background:#ececec" | [[Macintosh Classic II|Classic II]]
| 1991
| {{yes}}: 6.0.8L<ref name="6.0.8L">{{Cite web |date=August 17, 1995 |title=System 6.0.8L: ReadMe File (8/95) |url=http://docs.info.apple.com/article.html?artnum=10863 |archive-url=https://web.archive.org/web/20120426172514/http://support.apple.com/kb/TA28558?viewlocale=en_US |archive-date=April 26, 2012 |access-date=May 3, 2008 |publisher=[[Apple Inc]]}}</ref>
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[Macintosh Portable|Portable]]
| 1989
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
! style="background:#ececec" | [[Macintosh II|II]]
| 1987
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
! style="background:#ececec" | [[Macintosh IIx|IIx]]
| 1988
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
! style="background:#ececec" | [[Macintosh IIcx|IIcx]]
| rowspan=2 |1989
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
! style="background:#ececec" | [[Macintosh IIci|IIci]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[Macintosh IIfx|IIfx]]
| rowspan=3 |1990
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[Macintosh IIsi|IIsi]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[Macintosh LC|LC]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[Macintosh LC II|LC II]]
| 1992
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[Macintosh Quadra 700|Quadra 700]]
| 1991
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[Macintosh Quadra 900|Quadra 900]]/[[Macintosh Quadra 950|950]]
| 1991/1992
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[PowerBook 100]]
| 1991
| {{yes}}: 6.0.8L<ref name="6.0.8L"/>
| {{partial}}: limited<ref name="PowerBook100"/>
| {{partial}}: limited<ref name="PowerBook100"/>
| {{no}}
| {{no}}
| {{no}}

|-
! style="background:#ececec" | [[PowerBook 140]]<br/>[[PowerBook 145|145]]/[[PowerBook 145B|145B]]/[[PowerBook 170|170]]
| 1991/1992/1993
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}

|-

|}

==Version history==
{| border=1 cellpadding=1 cellspacing=0 style="font-size: 85%; border: gray solid 1px; border-collapse: collapse;" class="wikitable"

|-
! style="background:#ececec" | System version<ref name="versionhistory">{{Cite web |date=August 7, 2001 |title=Macintosh: System Software Version History |url=http://docs.info.apple.com/article.html?artnum=15582 |url-status=dead |archive-url=https://web.archive.org/web/20080420180131/http://docs.info.apple.com/article.html?artnum=15582 |archive-date=April 20, 2008 |access-date=April 22, 2008 |publisher=[[Apple Inc]]}}</ref>
! style="background:#ececec" | Release date<ref name="versionhistory"/>
! style="background:#ececec" | [[Finder (software)|Finder]] version<ref name="versionhistory"/>
! style="background:#ececec" | [[MultiFinder]] version<ref name="versionhistory"/>
! style="background:#ececec" | [[LaserWriter]] version<ref name="versionhistory"/>
! style="background:#ececec" | Release information<ref name="versionhistory"/>

|-
! style="background:#ececec; text-align: left" | 6.0
| April 1988{{citation needed|date=March 2014}}
| 6.1
| 6.0
| rowspan=8 |5.2
| Initial release

|-
! style="background:#ececec; text-align: left" | 6.0.1
| September 19, 1988
| 6.1.1
| 6.0.1
| Release for [[Macintosh IIx]] (1988)

|-
! style="background:#ececec; text-align: left" | 6.0.2
| September 19, 1988
| rowspan=2 |6.1
| 6.0.1
| Maintenance release

|-
! style="background:#ececec; text-align: left" | 6.0.3
| December 23, 1988<ref>{{Cite web |title=United States Macintosh System Software 6.0.3 - Change History |url=http://tech-insider.org/mac/research/1989/0131.html |url-status=live |archive-url=https://web.archive.org/web/20171107025800/http://tech-insider.org/mac/research/1989/0131.html |archive-date=2017-11-07 |access-date=2017-11-05}}</ref>
| 6.0.3
| Maintenance release with bug fixes for Apple File Exchange, Time Manager, and other components. New York 18 and 24 fonts were removed.

|-
! style="background:#ececec; text-align: left" | 6.0.4
| September 20, 1989
| 6.1.4
| 6.0.4
| Release for [[Macintosh Portable]] and [[Macintosh IIci|IIci]] (1989)

|-
! style="background:#ececec; text-align: left" | 6.0.5
| March 19, 1990
| 6.1.5
| 6.0.5
| Release for [[Macintosh IIfx]] (1990)

|-
! style="background:#ececec; text-align: left" | 6.0.6
| March 19, 1990 - October 15, 1990
| 6.1.6
| 6.0.6
| Packed with early Macintosh IIsi, LC, and Classic; contains bugs with keyboard and [[AppleTalk]].<ref>{{Cite magazine |date=December 1990 |title=MacBulletin - Apple Pulls System 6.0.6 |url=https://archive.org/stream/MacWorld_9012_December_1990#page/n17/mode/2up |magazine=MacWorld Magazine |page=17}}</ref>

|-
! style="background:#ececec; text-align: left" | 6.0.7
| October 15, 1990
| 6.1.7
| 6.0.7
| Official release for [[Macintosh LC]], [[Macintosh IIsi|IIsi]], and [[Macintosh Classic|Classic]] (1990)

|-
! style="background:#ececec; text-align: left" | 6.0.8
| May 13, 1991
| rowspan=2 |6.1.8
| rowspan=2 |6.0.8
| rowspan=2 |7.0
| Updated printing software to match the printing software of [[System 7|System 7.0]]

|-
! style="background:#ececec; text-align: left" | 6.0.8L
| March 23, 1992<ref name="6.0.8L"/>
| Used only on the [[Macintosh Classic]], [[Macintosh Classic II|Classic II]], [[Macintosh LC|LC]], [[Macintosh LC II|LC II]], and [[PowerBook 100]].

|}

== Timeline ==
{{Timeline of Macintosh operating systems}}

==References==
{{Reflist}}

==External links==
*[https://support.apple.com/kb/TA31885 Macintosh: System Software Version History] at [[Apple Inc.|Apple]]

{{S-start}}
{{Succession box
 | title = System 6
 | years = 1988
 | before = [[Classic Mac OS#System Software 5|System 5]]
 | after = [[System 7]]
}}
{{S-end}}

{{Classic Mac OS}}
{{Apple Inc. operating systems}}
{{Good article}}
[[Category:1988 software]]
[[Category:Classic Mac OS]]
[[Category:Proprietary operating systems]]
[[Category:Pascal (programming language) software]]