How does Memory work with the CPU إعداد المهندس منقذ العطار مركز البحث والتأهيل المعلوماتي \ جامعة الكوفة جامعة الكوفة مركز تطوير التدريس والتدريب الجامعي ورقة بعنوان

Definitions CPU Central Processing Unit (MHz) Arithmetical logical Input/output

RAM Random Access Memory (Byte) Allows stored data to be directly access random order

HDD Hard Disk Drive (Byte) for storing and retrieving digital information

Basic Mechanism RAM is only responsible for holding data while an application is running. Once the application is closed, the data is lost. Having more than one application open reduces the amount of temporary memory available to move data between the open applications and the CPU.

RAM has no moving parts The amount of data Direct random access to the data What makes RAM faster than HDD?

Whether data comes from permanent storage (the hard drive) or input (the keyboard), most data goes in random access memory (RAM) first.

Typical Scenario (Example) The actionThe process 1. You turn the computer on The computer loads the basic input/output system (BIOS) from ROM. The computer loads the operating system (OS) from the hard drive into the system's RAM.

The actionThe process 2. Open an applicationIt is loaded into RAM (only the essential parts of the program initially and then load other pieces as needed). 3. Executing the required process The results, changes or the feedback would send back to the temporary memory (RAM). 4. Save the filefile is written to the specified storage device (HDD in our example). 5. Close the applicationDelete all the Data of that application from the temporary memory (RAM)

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