Classic Mac OS
Mac OS 8.5
Mac OS 8.5 focuses on speed and stability, with most 68k code replaced by modern code native to the PowerPC. It also improved the appearance of the user interface, although the theming feature was cut late in development.

Classic Mac OS

Section Title: Mac OS 8.5
Table Section Text: Mac OS 8.5 focuses on speed and stability, with most 68k code replaced by modern code native to the PowerPC. It also improved the appearance of the user interface, although the theming feature was cut late in development.

System Version	Release Information

Mac OS 8.0	first version to require a 68040 processor, dropping support for the remainder of the Macintosh II series and other 68030 Macs.

Mac OS 8.1	last Mac OS release to run on a 68k processor, and it added support for USB on the iMac and added support for the HFS+ filesystem, also called Mac OS Extended

Mac OS 8.5	first version to run solely on a PowerPC processor, and it added built-in support for Firewire. It also added Sherlock and added support for the Power Macintosh G3

Mac OS 8.5.1	added bug fixes to lessen system crashes

Mac OS 8.6	included a new nanokernel for improved performance and Multiprocessing Services 2.0 support, improved PowerBook battery life, and added support for the PowerPC G4 processor

Sentence(s)

Mac OS 8.1 is the last version that could run on a 68k processor.

final_sentence: Mac OS 8.1 is the last version that could run on a 68k processor.