System 4

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System 4 is the fourth major upgrade of the Macintosh system software. System 4 was first released in January 1987.
==New features==
===System 4.0===
*Was a minor update from System 3, but did have some changes and new features.
*Introduced AppleShare client, to connect to file servers, as part of the OS.
*Updated the LaserWriter Driver to 3.3.
*Color Display Support/color support was added for the first time
*Included with the Macintosh SE.
===System 4.1===
*Updated the LaserWriter Driver to 4.0.
*Included with the Macintosh II.
===System 4.2===
*Improved the "About the Macintosh" dialog box; now contained RAM usage as seen through Mac OS 9.
*The Color menu was displayed on color capable Macs.
*Backgrounder, DA Handler, Early Access, and Print Moniter were added.
*Cooperative multitasking via MultiFinder was added.
*Updated the LaserWriter Driver to 5.0.
===System 4.3===
*Updated the Apple HD SC Setup partitioning software.
*Updated the LaserWriter Driver to 5.1.
==Release history==
* System 4.0 — January 1987
* System 4.1 — April 1987
* System 4.2 — October 1987
* System 4.3 — November 1987
==References==
*The develop CD and its spawn by Eric Rasmussen, Apple Macintosh before System 7. Archived 2011-11-22.
*Macintosh: System Software Version History, Apple Inc. 2012-02-19.
==External links==
*Apple Macintosh before System 7
*The Early Mac OS: System 4 - 5 at the Apple Museum
*System 4 at the Graphical User Interface Gallery
*Mac System Software 4.x at BetaWiki
*Classic Mac OS: System 1, 2, 3, and 4 at Wikipedia
Category:1987 introductions
Category:Discontinued Apple software