Read-only memory - Factbites

Read-only memory - Factbites
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Topic: Read-only memory

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	Read-only memory - Wikipedia, the free encyclopedia
		Some ROMs can be erased and re-programmed multiple times, although they are still referred to as "read only" because the reprogramming process involves relatively infrequent, complete erasure and reprogramming, not the frequent, bit- or word at a time updating that is possible with RAM (random access memory).
		EAROMs (Electrically Alterable Read-Only Memory) can be modified a bit at a time, but writing is intended to be an infrequent operation; most of the time the memory is used as a ROM.
		Read-only memory (ROM) is a class of storage media used in computers and other electronic devices.
	en.wikipedia.org /wiki/Read-only_memory (1587 words)

	Programmable read-only memory - Wikipedia, the free encyclopedia
		A programmable read-only memory (PROM) or field programmable read-only memory (FPROM) is a form of digital memory where the setting of each bit is locked by a fuse or antifuse.
		Read-only means that, unlike the case with conventional memory, the programming cannot be changed (at least not by the end user).
		As these read-only memories were both erasable, programmable and re-programmable, they constitute the first production implementation of the concept of EPROM and EEPROM memories, in manufacture prior to 1963.
	en.wikipedia.org /wiki/Programmable_read-only_memory (658 words)

	Read-Only Memory
		A further refinement in ROM technology is EEPROM (Electronically Erasable Programmable Read-Only Memory).
		These chips feature electronically reprogrammable read-only memory and rely on an internal battery for power.
		ROM information is etched onto tiny microchips inside the computer, and it can be read by the computer, but not changed.
	tms.ecol.net /computer/prom.htm (385 words)

	READ ONLY MEMORY
		ROM chips are loaded with data and programs during manufacture and, unlike RAM (random-access memory) chips, can subsequently only be read, not written to, by computer.
		ROM is used to form a computer's permanent store of vital information, or of programs that must be readily available but protected from accidental or deliberate change by a user.
		"ROM is a memory device in the form of a collection of integrated circuits (chips), frequently used in microcomputers.
	hagar.up.ac.za /catts/learner/mignon/Knoetze/prorom.html (119 words)

	Read-Only Memory (ROM)
		ROM is a type of memory that normally can only be read, as opposed to RAM which can be both read and written.
		Read-only memory is most commonly used to store system-level programs that we want to have available to the PC at all times.
		ROM: A regular ROM is constructed from hard-wired logic, encoded in the silicon itself, much the way that a processor is. It is designed to perform a specific function and cannot be changed.
	www.pcguide.com /ref/ram/typesROM-c.html (926 words)

	Read-Only Memory from FOLDOC
		ROM is also used for storage of the lowest level bootstrap software (firmware) in a computer.
		ROM is often used to hold programs for embedded systems since these usually have a fixed purpose.
		ROM is inherently non-volatile storage - it retains its contents even when the power is switched off, in contrast to RAM.
	foldoc.org /?query=ROM&action=Search (135 words)

	Read only memory (ROM):
		One type of programmable read-only memory uses small ``fuse links'' to connect the horizontal and vertical wires at each intersection.
		The link could also be a transistor which could be turned on or off, allowing a read-write type of memory to be implemented.
		To use the ROM to implement a logic function, the address lines are used as the variable inputs, and the contents of the memory are the function values.
	www.cs.mun.ca /~paul/cs3724/material/web/notes/node9.html (275 words)

	rom.htm
		ROM (Read Only Memory) would play an important role in making computers easier to use.
		The EPROM (Erasable Programable Read Only Memory) would allow designers to program ROMs themselves and even erase them by exposing them to ultravoilet light (this is why EPROMs have a clear window on top).
		Early microcomputers lacked ROM memory and had to be started by entering a bootstrap program, or sometimes the whole program that the user would want to run, directly into the computers memory via switchs on the front panel.
	www.cyberstreet.com /hcs/museum/rom.htm (132 words)

	Compact Disk Read Only Memory
		A read only optical disk similar to a commercial audio compact disk.
	cartage.org.lb /en/themes/Reference/dictionary/dictcomputer/C/77.html (21 words)

	read-only memory - a Whatis.com definition - see also: ROM
		ROM is "built-in" computer memory containing data that normally can only be read, not written to.
		Unlike a computer's random access memory (RAM), the data in ROM is not lost when the computer power is turned off.
		ROM contains the programming that allows your computer to be "booted up" or regenerated each time you turn it on.
	whatis.techtarget.com /definition/0,,sid9_gci214271,00.html (170 words)

	ROM (READ ONLY MEMORY)
		A type of memory chip that does not lose information, even when the power is turned off.
		ROM chips are also used to store programs for hand-held computers.
		Once data is programmed into the ROM chip, its contents cannot be altered.
	www.maran.com /dictionary/r/rom (56 words)

	Howstuffworks "How ROM Works"
		Read-only memory (ROM), also known as firmware, is an integrated circuit programmed with specific data when it is manufactured.
		ROM chips are used not only in computers, but in most other electronic items as well.
		This article is one in a series of articles dealing with computer memory, including:
	computer.howstuffworks.com /rom.htm (84 words)

	What is ROM? - A Word Definition From the Webopedia Computer Dictionary
		A variation of a ROM is a PROM (programmable read-only memory).
		Pronounced rahm, acronym for read-only memory, computer memory on which data has been prerecorded.
		Once data has been written onto a ROM chip, it cannot be removed and can only be read.
	www.webopedia.com /TERM/R/ROM.html (351 words)

	Read Only Memory (ROM)
		For this reason, developers created a type of ROM known as programmable read-only memory (PROM).
		A diode normally allows current to flow in only one direction and has a certain threshold, known as the forward breakover, that determines how much current is required before the diode will pass it on.
		Manufacturers responded to this limitation with Flash memory, a type of EEPROM that uses in-circuit wiring to erase by applying an electrical field to the entire chip or to predetermined sections of the chip called blocks.
	www.electronics.dit.ie /staff/tscarff/memory/rom.htm (1285 words)

	Read only memory
		Computer memory with information permanently stored in it that can be read but not altered.
	www.dmccormick.pwp.blueyonder.co.uk /jargon/read_only_memory.htm (15 words)

	Read-only memory-mapped files
		The "mmap" command for memory mapping is now part of the mvector package in CritLib [1].
		One of the nice things about "mmap" is that it can be faked entirely in pure Tcl (by reading the entire file on first access).
		Using data in such a way takes maximum advantage of virtual memory (VM).
	wiki.tcl.tk /2489 (792 words)

	Read-Only Memory - ROM
		Short for Read-Only Memory, ROM is a type of memory that is capable of holding data and being read from, however, not capable of being written too or having its data modified.
		Unlike RAM, ROM is capable of keeping its contents regardless if it has power or not.
		Were you able to locate the answer to your questions?
	www.computerhope.com /jargon/r/rom.htm (58 words)

	Definition: read-only memory
		read-only memory (ROM): A memory in which data, under normal conditions, can only be read.
	www.atis.org /tg2k/_read-only_memory.html (32 words)

	Read-only memory - Wikipedia, the free encyclopedia
		PROMs (Programmable Read-Only Memory) can be written to (programmed) via a special device, a PROM programmer.
		EAROMs (Electrically Alterable Read-Only Memory) can be modified a bit at a time, but writing is intended to be an infrequent operation; most of the time the memory is used as a ROM.
		The reading life of EAROMs and EEPROMs may be limited by charge leakage from the floating gates of the storage transistors, especially at high temperatures or in high radiation environments.
	en.wikipedia.org /wiki/Read-only_memory (1429 words)

	EPROM - Erasable Programmable Read Only Memory
		An acronym for Erasable Programmable Read Only Memory.
		Acronym for erasable programmable read-only memory, and pronounced ee-prom, EPROM is a special type of memory that retains its contents until it is exposed to ultraviolet light.
		/ee-prom/Erasable Programmable Read-Only Memory; A type of non-volatile memory chip that can be programmed electrically and erased by exposing the chip to ultraviolet light.
	www.auditmypc.com /acronym/EPROM.asp (620 words)

	* EPROM - (Computing): Definition
		Acronym for erasable programmable read-only memory, and pronounced ee-prom, EPROM is a special type of that retains its contents until it is exposed to ultraviolet light...
		In terms of its technology, flash memory is the modern-day successor to EPROM (electronic programmable read only memory), which had to be erased by exposing it to ultra-violet light...
		EPROM (Erasable Programmable Read Only Memory) - This is normally read-only memory that retains its information until it is exposed to ultraviolet light...
	en.mimi.hu /computing/eprom.html (620 words)

	ROM (read-only memory)
		Memory having fixed contents which cannot be altered, used to hold microprocessor programs, tables etc.
		-- Memory having fixed contents which cannot be altered, used to hold microprocessor programs, tables etc.
	lp2cd.com /audio_terms/r/rom.html (54 words)

	BIOSMAN BIOS chips bios upgrades update bios replacement bios flash firmware
		read in any order (for example, a disk or solid-state memory chip).
		Data stored in computer memory that can be accessed and read by the user, but not
		reads are performed across the entire array and all data is transferred to the
	www.biosman.com /glossary_R.htm (3312 words)

	READ-ONLY MEMORY TYPES
		circuit and used like a nonvolatile read/write memory.
		transistors, the gate between the memory cell and the
		intersection of a row and a column comprises a memory
	www.tpub.com /content/et/14091/css/14091_166.htm (342 words)

	Read Only Memory (ROM)
		A diode normally allows current to flow in only one direction and has a certain threshold, known as the forward breakover, that determines how much current is required before the diode will pass it on.
		Manufacturers responded to this limitation with Flash memory, a type of EEPROM that uses in-circuit wiring to erase by applying an electrical field to the entire chip or to predetermined sections of the chip called blocks.
		In silicon-based items such as processors and memory chips, the forward breakover voltage is approximately 0.6 volts.
	www.electronics.dit.ie /staff/tscarff/memory/rom.htm (1285 words)

	OLYMPUS MIC-D: Integrated Circuit Gallery - Intel Eraseable Programmable Read-Only Memory (EPROM)
		Once the contents of the memory are cleared, it is possible to reprogram the read-only memory chip.
		PROMs differ from EPROMs in that once they have had their instructions coded into the memory circuits, they cannot be erased.
		Known also as "electrically" or "erasable" PROMs, depending on the source of information, EPROMS retain the programming content in memory, until exposed to ultraviolet light or the proper sequence of electrical pulses.
	www.mic-d.com /gallery/chips/inteleprom1.html (275 words)

	Programmable_read-only_memory
		A '''programmable read-only memory''' ('''PROM''') is a form of digital memory where the setting of each bit is locked by a fuse or antifuse.
		A typical PROM comes with all bits reading as 1, burning a fuse during programming causes its bit to read as 0.
		PROM was invented in 1956 by Wen Tsing Chow, working for the Arma Division of the American Bosch Arma Corporation in Garden City, New York.
	q-basic.xodox.de /prom (326 words)

	Programmable read-only memory - Patent 4420820
		A semiconductor programmable memory cell according to the invention comprises a layer of polysilicon supported by a semiconductor substrate and separated from a surface of the substrate by an insulating layer.
		In that publication a memory cell is disclosed which comprises a layer of polysilicon mounted on an insulating layer which is provided on a surface of a semiconductor substrate, the polysilicon layer having three laterally spaced semiconductor regions which form two back-to-back diodes with two spaced apart PN junctions.
		One of the diodes serves as a programmable diode having a destructible junction, while the other diode is intended to have its junction remain intact and serves as an isolating diode.
	www.freepatentsonline.com /4420820.html (4475 words)

	EPROM - Wikipedia, the free encyclopedia
		An EPROM, or erasable programmable read-only memory, is a type of computer memory chip that retains its data when its power supply is switched off.
		As the glass window is expensive to make, OTP (one-time programmable) chips were introduced; the only difference is that the EPROM chip is packed in an opaque package, so it can not be erased after programming.
		EPROMs are easily recognisable by the transparent window in the top of the package, through which the silicon chip can be seen, and which admits UV light during erasing.
	en.wikipedia.org /wiki/Erasable_programmable_read-only_memory (4475 words)

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