that-ben
commented
1 year ago I just stumbled upon this thread and I can't help but add my grain of salt. 9.0.4 is not notable at all, but 9.1 certainly is. 9.1 was REQUIRED to run many apps that used lots of RAM like Photoshop back in the year 2001 and 2002. That requirement was because of the Memory Management Unit (MMU) that was added in Mac OS 9.1. All the subsequent Mac OS 9 releases after 9.1 were bug fixes and Classic Environment (OS9 ran inside Mac OS X) compatibility. Earlier this year, I took half an hour and made a table that shows all the features and improvements added to each Mac OS release from 7.0 to 9.2.2 and highlighted in bold a few notable Mac OS releases and 9.1 is definitely the most notable 9.x one, IMO... and 9.1 is certainly the best thing that happened to Mac OS since 8.1. https://www.macintoshrepository.org/297-mac-os-install-cd-library-macos-7-macos-8-macos-9
I don't think this makes it notable. 9.2.2 would be notable (even though it was a point release) because it was the final Mac OS 9 release. 9.0.4 just happens to be the last support version by SheepShaver due to it not emulating an MMU, but that's a technical quirk. There is no noticeable difference between 9.0 and 9.0.4 otherwise.