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Chapter 6. What’s under the Hood? > From Past to Present

From Past to Present

By now, you’re pretty familiar with the OS X Aqua interface. It is the most noticeable change to the Mac OS. But it is not the most dramatic change. If you were to look at the underlying structure of OS X, you would see something that has much more in common with a Unix system than with the Mac OS of days gone by. If you were to analyze the older Mac OS architecture, you would see a set of layered utilities, each with its own functions. These layers formed the connections between the computer’s hardware and the user.

The first layer, connected to the hardware, was the Mac OS core layer. This layer handled memory management, input and output, and communications (such as modem or network links).


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