OS4 on classic updates

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@AJCopland

680x0 *IS* emulated. In fact, thanks to the JIT emulator, 040 users will notice that 68k apps run much, much faster. If you add that 98% of the OS is native PPC code you get a huge speed up.

You can also use simple skins like the used on OS3.x and you will notice the speed even more.

OS4 for Classic is more or less the same as the A1 version but with different drivers

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@krize

WHDLoad won't work. But you can reboot to OS3.x to launch your game easily.

Demos probably not, but depends on the OS-friendliness of the demo.