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Velocity Engine

An addition to the PowerPC processor architecture, implemented on the G4 chip. It is built to speed up tasks such as graphics processing, and developers have to write special code to take advantage of it. Also known as AltiVec.



virtual memory

A method for making an operating system behave as if it has more RAM available than it actually has. In Mac OS 9 and earlier, this is accomplished by treating a user-specified amount of hard-drive space as “RAM.” In Mac OS X, virtual memory is always on, and the Mach kernel maintains virtual memory.




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