Twentieth Anniversary Macintosh
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Twentieth Anniversary Macintosh System Software  


System Software updates or upgrades that you can run on your Twentieth Anniversary Macintosh.

System Software Updates - Whole versions

Free update from Mac OS 9.x to 9.2.1

Available from

The Mac OS 9.2.1 Update improves Classic application compatibility in Mac OS X and delivers updated support for Macintosh systems that are based on the PowerPC G3 or G4 processor.
*** I cannot find if this version is supported, I will check and let you know ***

Free update from Mac OS 9.x to 9.1

Available from

Installing Mac OS 9.1 on a Twentieth Anniversary Macintosh with Virtual Memory turned on may result in a crash. To avoid the crash, turn off Virtual Memory and then install Mac OS 9.1.

Free update from Mac OS 9.0 to 9.0.4

Available from

Mac OS 9.0.4 is the latest update for the Macintosh operating system for all computers that are compatible with Mac OS 9. It provides additional FireWire and USB support, enhances networking and power management, and improves audio, video, and graphics functionality.

Free update from Mac OS 8.5.x to 8.6

Available from

Update Mac OS 8.5 or 8.5.1 to 8.6 for better system performance. Mac OS 8.6 offers improvements for Sherlock, improved media integration, greater device access and capabilities, improved printing and font mangagement, PowerBook energy efficiency, and support for Mac OS X Server. The download also includes Sherlock 2.1, LaserWriter 8.6.5, and Game Sprockets 1.1.4, among other Apple software updates.

Note: Some people have received "Error-39" messages after downloading. If you encounter this error, we suggest disabling StuffIt extensions before downloading, or using Internet Explorer's downloading utility for the download.

Free update from Mac OS 8.5 to 8.5.1

Available from

Mac OS 8.5.1 offers improvements to Drive Setup, fixes a memory leak in AppleScript and an extended format corruption issue, reenables the use of many third-party ADB devices, and provides some improved Internet proxy firewalls for Sherlock. In addition, new Sherlock plug-ins are included.

Free update from Mac OS 8 to 8.1

Available from

Mac OS 8.1 offers faster Java performance and tighter integration with Internet Explorer. However, you can still use the Web browser of your choice. Mac OS 8.1 supports the new Extended Volume Format for hard disks (also known as HFS+), an option for PowerPC users only. The Extended Volume Format optimizes the storage capacity of large hard disks by decreasing the minimum size of a single file. Existing hard disks formatted with Mac OS Standard Format, including 68K machines, will continue to function in and be supported by Mac OS 8.1. Among the many enhancements and bug fixes offered in this update, PC Exchange and Open Transport have been improved. Be sure to read the included documentation before installing.

Free update from Mac OS 7.6.x to 7.6.1

Available from

Mac OS 7.6.1 is a maintenance release for Mac OS 7.6 users. This release corrects a variety of problems that have emerged since the initial release of Mac OS 7.6 in January. Included in this update is the CFM-68K Runtime Enabler for 68030- and 68040-based Macintosh computers. Type 11 errors have also been eliminated on PowerPC machines, as they now report the proper error message instead of the generic Type 11 error. Finally, PowerBook users will benefit from a wide variety of bug fixes and compatibility updates for PC cards and serial port use. If you are using any of the following computers you should not install this update: Macintosh Performa 4400 or a Power Macintosh 4400, 5500, 6500, 7300, 8600, or 9600 series computer. PowerBook 3400 users should click on the related link below to obtain the Mac OS 7.6.1 for PowerBook 3400s.

All technical information from

Purple Bar

System Software Updates - Individual upgrades see Driver Update section.

Purple Bar


Specific Installation tips

Mac OS 9 install tips - Use the Easy Install option only. Using the selective install won't install all of the parts to make all of the front buttons work. The best video player performance is Apple Video Player 1.6.5 and Video Startup 1.6.5, and QuckTime 4.0.



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