File Name: ram and rom notes.zip
A memory unit is the collection of storage units or devices together.
Login Now. RAM is referred to as volatile memory and is lost when the power is turned off whereas ROM in non-volatile and the contents are retained even after the power is switched off. Classic mask-programmed ROM chips are integrated circuits that physically encode the data to be stored, and thus it is impossible to change their contents after fabrication.
Computer memory is broadly divided into two groups and they are:. The diagrammatic representation of the classification of computer memory is shown below:. Fig1: Classification of the Computer Memory. When the main memory holds instructions and data when a program is executing, the auxiliary memory or secondary memory holds data and programs which are not currently in use and furnishes long term storage. The primary memory and secondary memory are further classified into distinct groups and those are explained in the below diagram:.
Semiconductor memory is a digital electronic semiconductor device used for digital data storage , such as computer memory. It typically refers to MOS memory , where data is stored within metal—oxide—semiconductor MOS memory cells on a silicon integrated circuit memory chip. Most types of semiconductor memory have the property of random access ,  which means that it takes the same amount of time to access any memory location, so data can be efficiently accessed in any random order. Semiconductor memory also has much faster access times than other types of data storage; a byte of data can be written to or read from semiconductor memory within a few nanoseconds , while access time for rotating storage such as hard disks is in the range of milliseconds. For these reasons it is used for main computer memory primary storage , to hold data the computer is currently working on, among other uses.
Read-only memory , or ROM , is a form of data storage in computers and other electronic devices that can not be easily altered or reprogrammed. RAM is referred to as volatile memory and is lost when the power is turned off whereas ROM in non-volatile and the contents are retained even after the power is switched off. Random-access memory , or RAM , is a form of data storage that can be accessed randomly at any time, in any order and from any physical location in contrast to other storage devices, such as hard drives, where the physical location of the data determines the time taken to retrieve it. RAM allows the computer to read data quickly and efficiently to be able to run applications efficiently, whereas ROM stores the program required to initially boot the computer and perform diagnostics. RAM is a common type of memory found in computers and printers, and can go up to a few gigabytes. ROM is usually only a few thousand bytes of storage in personal computers. RAM is primary memory and volatile.
When people talk about computer memory, they usually mean the volatile RAM memory. RAM is a volatile memory and requires power to keep the data accessible. If the computer is turned off, all data contained in RAM is lost. Alternatively referred to as main memory, primary memory or system memory, RAM random-access memory is a hardware device that allows information to be stored and retrieved on a computer. It is super-fast and temporary data storage space that a computer needs to access right now or in the next few moments.
The User can write information to it and read information from it. With Ram any location can be reached in a fixed and short amount of time after specifying its address. The RAM is a volatile memory, it means information written to it can be accessed as long as power is on. As soon as the power is off, it can not be accessed. RAM is made in electronic chips made of so called semiconductor material, just like processors and many other types of chips.
While ROM is a non-volatile memory that retains data even when the power gets off. Another major difference between the two is that RAM allows both read and write data operation. As against ROM allows read operation only.
Semiconductor memory is the essential electronics component needed for any computer based PCB assembly. In addition to this, memory cards have become commonplace items for temporarily storing data - everything from the portable flash memory cards used for transferring files, to semiconductor memory cards used in cameras, mobile phones and the like. The use of semiconductor memory has grown, and the size of these memory cards has increased as the need for larger and larger amounts of storage is needed. To meet the growing needs for semiconductor memory, there are many types and technologies that are used. As the demand grows new memory technologies are being introduced and the existing types and technologies are being further developed.
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The information stored in this type of memory is lost when the power supply to the PC or laptop is switched off.