SUBSCRIBESUBSCRIBESUBSCRIBEHomeHistory & SocietyScience & TechBiographiesAnimals & NatureGeography & TravelArts & CultureProConMoneyGames & QuizzesVideosOn This DayOne Good FactDictionaryNew ArticlesHistory & SocietyLifestyles & Social IssuesPhilosophy & ReligionPolitics, Law & GovernmentWorld HistoryScience & TechHealth & MedicineScienceTechnologyBiographiesBrowse BiographiesAnimals & NatureBirds, Reptiles & Other VertebratesEnvironmentFossils & Geologic TimeInsects & Other InvertebratesMammalsPlantsGeography & TravelGeography & TravelArts & CultureEntertainment & Pop CultureLiteratureSports & RecreationVisual ArtsImage GalleriesPodcastsSummariesTop QuestionsLists and StoriesBritannica KidsAsk the ChatbotGames & QuizzesHistory & SocietyScience & TechBiographiesAnimals & NatureGeography & TravelArts & CultureProConMoneyVideoscomputer memoryIntroductionMain memoryMagnetic drum memoryMagnetic core memorySemiconductor memoryAuxiliary memoryMagnetic disk drivesMagnetic tapeOptical discsMagneto-optical discsMemory hierarchyReferences & Edit HistoryRelated TopicsImagesComputers and Technology QuizComputers and Operating SystemsTechnologyComputersFacebookXhttps://www.britannica.com/technology/computer-memoryComputer History Museum - Memory & StorageEngineering LibreTexts - MemoryInstitute for Statistics and Mathematics Resources Web Page - Computer MemoryOpenStax - Introduction to Computer Science - Memory ManagementACM Digital Library - Evolution of computer memory structure (PDF)University of Rhode Island - College of Arts and Sciences - Department of Computer Science and Statistics - How Computers Work: The CPU and MemoryUniversity of Babylon - Computer MemoryStanford University - Computer Hardware (Memory)David Hemmendinger
Professor Emeritus, Department of Computer Science, Union College, Schenectady, New York. Coeditor of Encyclopedia of Computer Science, 4th ed. (2000).Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....Historydatadigital computerbinary codebitcapacitortransistorsauxiliaryMain memorycomputers: The first computerelectron tubescomputers: The first stored-program machinesmercuryrandom-access memoryMagnetic drum memoryMagnetic core memoryinherentsemiconductorBritannica Quiz
Computers and Operating SystemsSemiconductor memoryStatic RAMcentral processing unitDynamic RAMtransistordischargechipdecodingSUBSCRIBE
Main memories take longer to access data than CPUs take to operate on them. For instance, DRAM memory access typically takes 20 to 80 nanoseconds (billionths of a second), but CPU arithmetic operations may take only a nanosecond or less. There are several ways in which this disparity is handled. CPUs have a small number of registers, very fast SRAM that hold current instructions and the data on which they operate. Cachecachesubsequentoperating systemBIOSpersonal computerJay Wright Forrestermercury delay linebuffernonvolatile memoryflip-flopauxiliary storageSee all related contentEPROMflash memory
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