How does Jag differ so much, not retro-compatible?

michaelsanford

michaelsanford

Translator, Web Developer
I've noticed a lot of new apps on VT that are "10.2 compatible" are in reality "10.2 dependant".

Just curious, what changed so much in 10.2 to make (some) 10.2 apps not work in 10.1? I presume they didn't change the cocoa framework that much, but I guess I'm wrong! :p
 
Version 10.2 of OSX was a major code overhaul for the new OS.
The screen drawing is now hardware accelerated (a MAJOR change to how the GUI is drawn), there is a new version of the Java Virtual Machine for running Java apps, plus many, many updated system components.
OSX 10.2 is also compiled with, and works best with apps compiled with the newer version (3.2.2, I think) of the compiler used to construct apps in their final state. The apps, and the OS are actually made differently than they were in 10.1.x.
 
Also, quite a few new small shareware apps (with authors who apparently don't care about millions of 10.1 users :)) have used the new brushed metal theme in 10.2 without giving users the option to turn it off. So, a new brushed metal app will launch on 10.1 but instantly quit. (at least that happened to me right before i upgraded to 10.2)
 
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