What is computer memory?

Computer Memory

In computing, memory refers to the physical devices used to store programs (sequences of instructions) or data (e.g. program state information) on a temporary or permanent basis for use in a computer or other digital electronic device. The term primary memory is used for the information in physical systems which function at high-speed (i.e. RAM), as a distinction from secondary memory, which are physical devices for program and data storage which are slow to access but offer higher memory capacity. Primary memory stored on secondary memory is called "virtual memory".

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Some articles on computer memory:

Secondary Emission - Historic Applications - Early Computer Memory Tubes
... The first random access computer memory used a type of cathode ray tube called the Williams tube that used secondary emission to store bits on the tube face ... Another random access computer memory tube based on secondary emission was the Selectron tube ... Both were made obsolete by the invention of magnetic core memory ...
Computer Memory - Management of Memory - Protected Memory
... Protected memory is a system where each program is given an area of memory to use and is not permitted to go outside that range ... Use of protected memory greatly enhances both the reliability and security of a computer system ... Without protected memory, it is possible that a bug in one program will alter the memory used by another program ...
Serial Presence Detect
... to a standardized way to automatically access information about a computer memory module ... When an ordinary modern computer is turned on, it starts by doing a power-on self-test (POST) ... SPD is a memory hardware feature that makes it possible for the computer to know what memory is present, and what timings to use to access the memory ...
Analog Hole - Engineering Vs. Business and Political Views
... widespread buzz about unauthorized digital music downloads being held in computer memory caches ... The legislators, hearing a very general piece of computer jargon (caching) associated with infringement, banned it, not realizing it was a basic digital storage technique found in most modern equipment ... and the general public the aspect that every computer and most digital devices of any kind would have to be destroyed were the law to be evenly enforced ...

Famous quotes containing the words memory and/or computer:

    Men like my father cannot die. They are with me still real in memory as they were in flesh. Loving and beloved forever. How green was my valley then.
    Philip Dunne (1908–1992)

    What, then, is the basic difference between today’s computer and an intelligent being? It is that the computer can be made to see but not to perceive. What matters here is not that the computer is without consciousness but that thus far it is incapable of the spontaneous grasp of pattern—a capacity essential to perception and intelligence.
    Rudolf Arnheim (b. 1904)