• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
PDF
PDF

... magnetosphere. It keeps solar winds and cosmic rays from scouring away our atmosphere, and protects spacecraft, satellites, astronauts, and air travelers. But where does the magnetic field come from? The inner core of Earth is very, very hot—about 6,000°C, same as the surface of the sun. At that tem ...
Papers - gtcad
Papers - gtcad

... Processor with Stacked Memory) is a two-tier 3D IC, where the logic die consists of 64 general-purpose processor cores running at 277MHz, and the memory die contains 256KB SRAM (see Fig. 10.6.1). Fabrication is done using 130nm GlobalFoundries device technology and Tezzaron TSV and bonding technolog ...
Y.Nikulshin - Magnetic Simulations of HTS-FCL
Y.Nikulshin - Magnetic Simulations of HTS-FCL

... Institute of Superconductivity, Department of Physics Bar-Ilan University, Israel Sponsored by the Israeli Ministry of National Infrastructures We present here the results of static and transient magnetic simulations of a single core Fault Current Limiter (FCL), saturated by a High-Tc Superconductin ...
Inside RAM
Inside RAM

KOMPOSPEED® JZ-HF-500-C halogen-free, microbes
KOMPOSPEED® JZ-HF-500-C halogen-free, microbes

Embedded Multicores Example of Freescale solutions
Embedded Multicores Example of Freescale solutions

... – More cores => longer buses => slower buses – More cores => less bandwidth per core ...
Lecture 14 - MemoryOrganization2
Lecture 14 - MemoryOrganization2

Sediment sampling
Sediment sampling

... SDI Specialty Devices USA developed a Vibecore-D for sediment sampling. The Vibrecore has recently also become available in Europe. Aquifer Consultancy obtained a distribution agreement. The vibrecore is a handy device and can be easily operated from a small workboat. With a high vibration frequency ...
05 Internal Memory
05 Internal Memory

... —Reduces number of address pins – Multiplex row address and column address – 11 pins to address (211=2048) – Adding one more pin doubles range of values so x4 ...
< 1 ... 5 6 7 8 9

Magnetic-core memory



Magnetic-core memory was the predominant form of random-access computer memory for 20 years between about 1955 and 1975. Such memory is often just called core memory, or, informally, core.Core uses tiny magnetic toroids (rings), the cores, through which wires are threaded to write and read information. Each core represents one bit of information. The cores can be magnetized in two different ways (clockwise or counterclockwise) and the bit stored in a core is zero or one depending on that core's magnetization direction. The wires are arranged to allow for an individual core to be set to either a one or a zero and for its magnetization to be changed by sending appropriate electric current pulses through selected wires. The process of reading the core causes the core to be reset to a zero, thus erasing it. This is called destructive readout. When not being read or written, the cores maintain the last value they had, even when power is turned off. This makes them nonvolatile.Using smaller cores and wires the memory density of core slowly increased, and by the late 1960s a density of about 32 kilobits per cubic meter was typical. However, reaching this density required extremely careful manufacture, almost always carried out by hand in spite of repeated major efforts to automate the process. The cost declined over this period from about $1 per bit to about 1 cent per bit. The introduction of the first semiconductor memory SRAM chips in the late 1960s began to erode the core market. The first successful DRAM, the Intel 1103 which arrived in quantity in 1972 at 1 cent per bit, marked the beginning of the end of core. Improvements in semiconductor manufacturing led rapid increases in storage and decreases in price that drove core from the market by around 1974.Although core memory is obsolete, any computer memory is still occasionally called ""core""; in particular, a file recording the contents of memory after a system error is usually called a core dump.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report