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Xirka Wimax chipset, a chip made by an Indonesian native, not an easy effort is made chips with a fairly high complexity. Xirka Indonesian engineer who escorted some of these were developed in 2006. This chipset consists of two specifications, namely Chipset Xirka for Fixed Wimax and Mobile Wimax Chipset Xirka for. For fixed wimax was launched in August this year. While mobile wimax slated for release in the fourth quartal 2009.Produk original made in Indonesia was launched by the Minister of Research and Technology of the Republic of Indonesia, Kusmayanto Kadiman. He explained that all the components in the Xirka is made in Indonesia. Wimax operators who provide services must use Xirka.
Computer memory speeds up the processing of data by the central processing unit, or CPU. Memory is accessed much faster than a physical storage device, such as a hard drive. By placing certain data in memory, the computer can access the data quicker, which allows its overall functioning to be more efficient.
Functions of Computer Memory
Computers store data and sets of instructions in memory for quick access. The operating system’s core files are stored in the memory so the computer is functional for the user. As processes are executed, needed information is stored in the memory so that the CPU can quickly navigate between the data that it needs. This prevents the CPU from needing to access the hard drive for everything.
Multi-tasking uses memory to allow a user to run multiple programs at once. Different programs are stored so they can be switched between seamlessly. This enhances the user’s productivity.
Memory access speeds are thousands of times faster than hard drive access speeds. A hard drive is a mechanical device with moving parts. It can only find and use data at a certain rate. Memory is lightning fast in accessing what it holds. This makes using your computer much more efficient and pleasant.
The computer does its primary work in a part of the machine we cannot see, a control center that converts data input to information output. This control center, called the central processing unit (CPU), is a highly complex, extensive set of electronic circuitry that executes stored program instructions. All computers, large and small, must have a central processing unit. As Figure 1 shows, the central processing unit consists of two parts: The control unit and the arithmetic/logic unit. Each part has a specific function.
Before we discuss the control unit and the arithmetic/logic unit in detail, we need to consider data storage and its relationship to the central processing unit. Computers use two types of storage: Primary storage and secondary storage. The CPU interacts closely with primary storage, or main memory, referring to it for both instructions and data. For this reason this part of the reading will discuss memory in the context of the central processing unit. Technically, however, memory is not part of the CPU.
Recall that a computer’s memory holds data only temporarily, at the time the computer is executing a program. Secondary storage holds permanent or semi-permanent data on some external magnetic or optical medium. The diskettes and CD-ROM disks that you have seen with personal computers are secondary storage devices, as are hard disks. Since the physical attributes of secondary storage devices determine the way data is organized on them, we will discuss secondary storage and data organization together in another part of our on-line readings.
Now let us consider the components of the central processing unit.