<page_title> Classic Mac OS </page_title> <section_title> Mac OS 8.5 </section_title> <table> <cell> Mac OS 8.1 <col_header> System Version </col_header> <col_header> Mac OS 8.0 </col_header> </cell> <cell> 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 <col_header> Release Information </col_header> <row_header> Mac OS 8.1 </row_header> </cell> </table>
Mac OS 8.1 is the last version that could run on a 68k processor.