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Forum Discussion
End of support for OS X 10.4 and 10.5
Why pull support and remove functionality? Why not just drop support -- just stop updating the app but still allow basic functionality? There are still a lot of legacy machines that are still in use ...
@ Josh K.
Thanks for your reply giving more information.
Regarding your statement "For example in the coming months we will need to make a change to how we represent the underlying identifier we use for certain types of folders. This change is needed because Dropbox has become so much more popular than we initially imagined that we’ll need to switch from using a 32-bit identifier to a 64-bit identifier.", why is it not possible to implement the required changes in a progressive manner until a true 'deal breaker' arises?
I ask this because AFAIK:
Both the G4 and G5 CPUs support AltiVec, which provides thirty-two 128-bit registers to hold vectors.
The G5 processor true 64 bit CPU delivered 32 individual 64-bit GPRs and a 42-bit MMU (memory management unit) for directly addressing 4TB of RAM, although the PowerMac G5 hardware was limited to 8GB.
The G5 is not constrained by the register problem of 32-bit x86; the 64-bit G5 has the same number of registers as the G4
In terms of OS capabilities,
10.4 Tiger:
32 bit System, Apps, Cocoa, Carbon, KEXTs, Drivers, and Kernel
64 bit Processes, Servers and Unix
10.5 Leopard:
32 bit System, Apps, Cocoa, Carbon, KEXTs, Drivers, and Kernel
64 bit Apps, Coacoa, and Unix
10.6 Snow Leopard:
32 bit System, Apps, Cocoa, Carbon,
64 bit System, Apps, Coacoa, and Unix, KEXTs, Drivers, and Kernel
But note that OS X Snow Leopard boots by default into a 32-bit kernel on every Mac other than the rack-mount Xserve.
