|What is it?||Types|
|BYTE||(8 bits) A character can be a number, symbol, or letter.|
|KILOBYTE||(1000 characters) One page of double spaced text.|
|MEGABYTE||one million (1,000,000) characters or one novel.|
|GIGABYE||One billion (1,000,000,000) characters or one thousand novels.|
What is Memory?
Data and program instructions are stored in the electronic circuitry of the computer until it is their turn to be processed. This circuitry area is called memory. It is sometimes called primary storage. Many people confuse memory with disk storage. The media that stores information that is not related to the processor is called storage. Memory refers to the circuits that are directly linked to the processor. This circuit board is called a single in-line memory module (SIMM). It contains three to nine DIP packages. A dual in-line package (DIP) is a memory module that stores 256 kilobytes of data.
The memory chips need to be able to communicate directly with the central processing unit. In some earlier computers, memory was soldered directly onto the motherboard or the logic board. The need for more and more memory for software solutions, requires that memory now be added onto the board through modules. Most computers come with a standard 8 megabytes (8 million bytes) of RAM with room on the logic board to add more memory. The amount that one can add is dependent upon the machine and the manufacturer of the computer.
Random Access Memory (RAM) **TEMPORARY MEMORY**
How much RAM is needed for your computer?
RAM is measured in megabytes. The software that you use is really the measure of how much RAM you need. Most computers have between 4 and 32 megabytes of RAM. To run the typical Windows 95 operating system 8 megabytes of RAM is needed and 16 megabytes (16 million bytes of data) is recommended. When your software requires more RAM than your computer currently has, you can purchase additional RAM to expand the memory capacity. Each computer has a limit to the amount of RAM you can add. Check carefully when buying your computer. RAM is specific for each computer. Check carefully for the correct type, speed and configuration for you computer.
Virtual Memory **DISK BASED MEMORY**
Read only Memory (ROM) **PERMANENT MEMORY**
CMOS Memory (complementary metal oxide semiconductor) **BATTERY POWERED MEMORY**
CMOS stores important information about the configuration of the computer even when the power is off. During the boot process the computer checks for the amount of RAM and the available disk drives. The CMOS stores the boot data information such as the number of hard drive track and sectors. The computer needs to know this information to find the operating system of the computer during the boot up process.This memory is less permanent than ROM; it can be updated. When the system configuration is changed, the CMOS needs to be changed and updated also. In older systems this is done through a set up program. In Windows 95, the plug and play feature helps with updating when new devices are added. The CMOS needs little power to keep its data. It is powered by a battery.
Types of memory that can be added to a computer:
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