Any part of the OS that hasn't changed since Mac OS 9?

[KoolAid-Drink]

I know it's been about 23 years since the OS was first released, as Mac OS X at the time, and the system has changed/evolved considerably over time.

I was wondering—are there any parts of the OS (internally or externally) that hasn't changed/been improved since Mac OS 9? Can be a framework or application. Not UI-wise, necessarily, but function-wise.

 

[gilby101]

Very little has remained unchanged because OS X was a complete rewrite - based on NeXTSTEP, not OS 9. The relevant Wikipedia pages may be helpful for you.

 

[f54da]

Maybe Carbon framework? Pascal strings still survive in a lot of places in mac source and have a nice clang extension. QuickDraw has tendrils in a lot of places.

 

[KoolAid-Drink]

Maybe Carbon framework? Pascal strings still survive in a lot of places in mac source and have a nice clang extension. QuickDraw has tendrils in a lot of places.

I thought Carbon was completely done with when macOS transitioned to complete 64-bit and did away with 32-bit in 10.15 (Catalina)?

 

[galad]

Carbon is an umbrella framework that contains different parts, many were new and added after OS X 10.0.
It's still being used internally by a bunch of components, for example the menu were Carbon until macOS 14.

Anyway, I don't think there is any big part left from Mac OS 9. The few things left had been removed in 10.15, for example the QuickTime framework. QuickDraw is no more, OpenTrasport is no more.

 

[zevrix]

Yes, the word "Finder".

 

[f54da]

>I thought Carbon was completely done with when macOS transitioned to complete 64-bit

Carbon framework and HIToolbox still exists, but less and less of it is actually useable.