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Topic: Random access memory

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Computer memory

Primary storage

Computer storage

Dynamic random access memory

Static random access memory

Extended memory

Volatile memory

Magnetic core memory

NVRAM

NRAM

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	Random access memory - Wikipedia, the free encyclopedia
		Most RAM can be both written to and read from, so "RAM" is often used interchangeably with "read-write memory." In this sense, RAM is the opposite of Sequential Access Memory.
		The basic concepts of tube and core memory are used in modern RAM implemented with integrated circuits.
		Modern RAM generally stores a bit of data as either a charge in a capacitor, as in dynamic RAM, or the state of a flip-flop, as in static RAM.
	en.wikipedia.org /wiki/Random_access_memory (1133 words)

	Encyclopedia :: encyclopedia : Random Access Memory (Site not responding. Last check: 2007-10-22)
		This is in contrast to sequential memory devices such as magnetic tapes, discs and drums, in which the mechanical movement of the storage medium forces the computer to access data in a fixed order.
		RAM is typically used for primary storage (main memory) in computers to hold actively used and actively changing information, although some devices use certain types of RAM to provide long-term secondary storage.
		Core memory, which used wires attached to small ferrite electromagnetic cores, also had roughly equal access time (the term “core” is still used by some programmers to describe the RAM at the heart of a computer).
	www.hallencyclopedia.com /Random_Access_Memory (904 words)

	Dynamic random access memory - Wikipedia, the free encyclopedia
		Dynamic random access memory (DRAM) is a type of random access memory that stores each bit of data in a separate capacitor.
		A few real-time systems refresh a portion of memory at a time based on an external timer that governs the operation of the rest of the system, such as the vertical blanking interval that occurs every 10 to 20 ms in video equipment.
		Memory controllers in most modern PCs can typically detect, and correct errors of a single bit per 64 bit "word" (the unit of bus transfer), and detect (but not correct) errors of two bits per 64 bit word.
	en.wikipedia.org /wiki/Dynamic_random_access_memory (2418 words)

	Random Access Memory - tScholars.com
		These are commonly called memory sticks or RAM sticks because they are manufactured as small circuit boards with plastic packaging and are about the size of a stick of gum.
		Technically, RAM devices are not limited to memory chips, and random-access memory as a storage format is not limited to use as working memory.
		Core memory, which used wires attached to small ferrite electromagnetic cores, also had roughly equal access time (the term “core” is still used by some programmers to describe the RAM main memory of a computer).
	www.tscholars.com /encyclopedia/Random_Access_Memory (1371 words)

	RAM (random access memory) (a definition)
		RAM (random access memory) is the place in a computer where the
		RAM is much faster to read from and write to than the other kinds of storage in a computer, the hard disk, floppy disk, and CD-ROM.
		RAM is organized and controlled in a way that enables data to be stored and retrieved directly to specific locations.
	servercc.oakton.edu /~glance/RAM.html (595 words)

	Howstuffworks "How RAM Works"
		RAM is considered "random access" because you can access any memory cell directly if you know the row and column that intersect at that cell.
		In the most common form of computer memory, dynamic random access memory (DRAM), a transistor and a capacitor are paired to create a memory cell, which represents a single bit of data.
		Memory cells are etched onto a silicon wafer in an array of columns (bitlines) and rows (wordlines).
	computer.howstuffworks.com /ram.htm (1221 words)

	[No title]
		Random access memory or RAM is a type of computer storage whose contents can be accessed in any order.
		It is usually implied that RAM can be both written to and read from, in contrast to read-only memory or ROM.
		In the first electronic computers, RAM was built from vacuum tubes, and later magnetic cores.
	wikiwhat.com /encyclopedia/r/ra/random_access_memory.html (389 words)

	What is RAM? - a definition from Whatis.com - see also: random access memory
		RAM (random access memory) is the place in a computer where the operating system, application programs, and data in current use are kept so that they can be quickly reached by the computer's processor.
		RAM is small, both in physical size (it's stored in microchips) and in the amount of data it can hold.
		RAM comes in the form of "discrete" (meaning separate) microchips and also in the form of modules that plug into holes in the computer's motherboard.
	searchmobilecomputing.techtarget.com /sDefinition/0,,sid40_gci214255,00.html (683 words)

	Random Access Memory
		To increase the amount of RAM in your computer, you'll install additional memory chips in RAM expansion slots on the main circuit board.
		Memory modules also come in different pin configurations, and you must use the right type of RAM for your computer's expansion slots.
		The time it takes a CPU to access information stored in RAM is measured in nanoseconds, abbreviated "ns." A nanosecond is a millionth of a second.
	www.spokane.net /pluggedin/pram.asp (531 words)

	Static Random Access Memory Encyclopedia Article @ 216.92.85.60 (Site not responding. Last check: 2007-10-22)
		Static random access memory (SRAM) is a type of semiconductor memory.
		The word "static" indicates that the memory retains its contents as long as power remains applied, unlike dynamic RAM (DRAM) that needs to be periodically refreshed.
		Random access means that locations in the memory can be written to or read from in any order, regardless of the memory location that was last accessed.
	216.92.85.60 /encyclopedia/Static_Random_Access_Memory (1152 words)

	Random Access Memory - ninemsn Encarta
		Random Access Memory or RAM, in computer science, a semiconductor-based memory that can be read and written to by the microprocessor or other hardware devices.
		Note that the various types of ROM memory are capable of random access.
		The term RAM, however, is generally understood to refer to volatile memory, which can be written to as well as read.
	au.encarta.msn.com /encyclopedia_761553199/Random_Access_Memory.html (76 words)

	random access memory
		random access memory is a system which displays images made by the public at large with digital cameras.
		The images in ram are shown on screen for approximately 5 seconds (depending on the context), which is enough time to parse most images and appreciate a few details, but not enough time to form any definitive hypothesis as to it’s origins and the intentions of the photographer.
		All of the images shown in ram are public in the sense that they have been made accessible on the internet for google to index and for ram to download.
	www.boring.ch /ram (944 words)

	Magnetic random access memory element patent invention
		A first access transistor inter-connects a false one of the bit lines to the false node of the latching circuit, while a second access transistor inter-connects a true one of the bit lines to the true node of the latching circuit.
		The memory storing structure of the element 10 is referred to as a "magnetic tunnel junction" 16 (MTJ) which is represented in the schematic by a variable resistance and is physically composed of the first and second magnetic layers and the separating non-magnetic layer discussed above.
		The access transistor 18 in the illustrated element 10 is an n-channel FET with its source conduction terminal connected to ground and its drain conduction terminal connected to the other end of the resistance.
	www.freshpatents.com /Magnetic-random-access-memory-element-dt20060105ptan20060002186.php (1819 words)

	Random Access Memory (RAM)
		Just like static RAMs, the memory on a dynamic RAM memory chip is organized in a matrix formed by rows and columns of memory cells.
		Although a row of cells is refreshed during a read or write, the randomness of memory references cannot guarantee that every word in a memory module is refreshed within the 2-ms time limit.
		In a memory refresh cycle, a row address is sent to the memory chips, and a read operation is performed to refresh the selected row of cells.
	www.electronics.dit.ie /staff/tscarff/memory/ram.htm (1008 words)

	Random Access Memory
		Random Access Memory (RAM) is the operational memory of a computer.
		As RAM technology has advanced, new types of RAM were created with greater storage capacity and faster access times.
		Drivers for RAM devices are built into the BIOS microcode of most mainboards with additional drivers being installed by the operating system.
	www.inetdaemon.com /tutorials/computers/hardware/memory/ram.shtml (135 words)

	What is random access? - A Word Definition From the Webopedia Computer Dictionary
		The opposite of random access is sequential access.
		The terms random access and sequential access are often used to describe data files.
		RAM Memory Is Easy at Arch Memory - Provides a complete gateway to quality computer memory, with overnight shipping available.
	www.webopedia.com /TERM/R/random_access.html (331 words)

	Dynamic random access memory - Facts, Information, and Encyclopedia Reference article
		DRAM is a type of random access memory that stores each bit of data in a separate capacitor.
		Because it must be refreshed periodically, it is a dynamic memory as opposed to SRAM and other static memory.
		At the time of writing (December 2004), DDR is still the main memory standard, but DDR2 is now supported by some chipsets and is beginning initial adoption.
	www.startsurfing.com /encyclopedia/d/r/a/DRAM_ebae.html (2381 words)

	What is RAM? - A Word Definition From the Webopedia Computer Dictionary
		Pronounced ramm, acronym for random access memory, a type of computer memory that can be accessed randomly; that is, any byte of memory can be accessed without touching the preceding bytes.
		RAM is the most common type of memory found in computers and other devices, such as printers.
		To be precise, therefore, RAM should be referred to as read/write RAM and ROM as read-only RAM.
	www.webopedia.com /TERM/R/RAM.html (644 words)

	Random Access Memory (RAM)
		Memory, better known as Random Access Memory (RAM) is a set of chips used to store information.
		This means that memory that does parity checking is able to verify that it is functioning correctly when running.
		Most memory sold today is non-parity RAM, and is only checked for errors on start up by writing to and reading from every location in memory.
	www.inetdaemon.com /tutorials/computers/hardware/memory (167 words)

	Random Access Memory (RAM) (Site not responding. Last check: 2007-10-22)
		RAM is perhaps the most important of the input/output devices.
		RAM can only hold values while power is going through it.
		The amount of RAM in your computer is obviously a pretty important factor.
	www.cs.iupui.edu /~aharris/mmcc/mod5/abhw60.html (451 words)

	Definition: random access memory (Site not responding. Last check: 2007-10-22)
		random access memory (RAM): A read /write, nonsequential-access memory used for the storage of instructions and data.
		Note 1: RAM access time is essentially the same for all storage locations.
		Note 2: RAM is characterized by a shorter access time than disk or tape storage.
	www.atis.org /tg2k/_random_access_memory.html (62 words)

	Smart Computing Article - Random-Access Memory (Site not responding. Last check: 2007-10-22)
		Memory is the most common cause of frustration for PC users, probably because it is so vital to a PC's operation and performance.
		The reason that the memory requirements jump so sharply with Windows is that there's a lot going on: the multicolor graphical user interface, multiple opened windows, and the computing that a program does on top of that.
		By setting memory as drive space, you may be able to detect and isolate a memory problem to a specific chip.
	www.smartcomputing.com /editorial/article.asp?article=articles/archive/r0401/24r01/24r01.asp&guid=t2nw1hno&searchtype=0&WordList=config.sys (6241 words)

	Random Access Memory (Site not responding. Last check: 2007-10-22)
		RAM Disk- The RAM disk is a block of DRAM that is configured to work as a hard drive.
		Cache memory is a special section of memory that uses a fast static RAM chips,(SRAM), and serves as a shortcut to allow the processor access to certain types of data at very high speeds.
		Cache memory allows frequently requested data to go into the processor in as little as 45 nanoseconds.
	www.tekiq.com /education/random_access_memory.htm (694 words)

	TCS - Random Access Memory!
		Core memory units were built to a maximum of 48K and were used in the US until 1993.
		The last USAF tube type computer operating in the United States with a memory core unit was finally shut down in the summer of 1986.
		Memory chips were put on separate printed circuit boards with 8 chips for no-parity and 9 chips for a parity bit location.
	www.tcs.org /ioport/feb03/RAMinfo.htm (797 words)

	math lessons - Random Access Memory
		In the summer of 2003, a 128 Kib Magnetic RAM chip was introduced, which was manufactured with 0.18 micrometre technology.
		In 2005, Compu-Technics Inc. presented a 256 GiB/4GHz non-volatile Magnetic RAM array, as well as a notebook using this chip, SG220.
		As for carbon nanotube memory, a high-tech startup Nantero has built a functioning prototype 10 GiB array in 2004.
	www.mathdaily.com /lessons/RAM (639 words)

	Random Access Memory (Site not responding. Last check: 2007-10-22)
		dynamic RAM in which a bit of memory is a storage capacitor in either the charged or discharged condition.
		The largest dynamic RAM is 260K and hence is used for normal applications while the static RAM is used for special fast applications within the same computer.
		Both types of RAM are volatile, meaning that stored information is lost when power is removed from the chip.
	www.phys.ualberta.ca /~gingrich/phys395/notes/node178.html (209 words)

	RAM (RANDOM ACCESS MEMORY) (Site not responding. Last check: 2007-10-22)
		Memory works like a flboard that is constantly overwritten with new data.
		The amount of memory, or memory size, in a computer determines the number of programs you can run at once.
		Memory size also determines how fast your programs will operate.
	www.maran.com /dictionary/r/ram/index.html (67 words)

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