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Object used to guide and confine magnetic fields
A magnetic core is a piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical, electromechanical
Magnetic_core
Type of computer memory used from 1955 to 1975
magnetic-core memory is a form of random-access memory. It predominated for roughly 20 years between 1955 and 1975, and is often just called core memory
Magnetic-core_memory
Early form of read-only memory
the punch tape with magnetic tape and a more complex encoding scheme. Similar to magnetic-core memory, magnetic rings (or cores) are used to determine
Core_rope_memory
Magnet that creates a magnetic field through an electric current
wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes
Electromagnet
Ferrimagnetic ceramic material
applications like magnetic cores for transformers to suppress eddy currents. Ferrites can be divided into two groups based on their magnetic coercivity, their
Ferrite_(magnet)
Electrical component
the wire. This is called a ferromagnetic-core or iron-core coil. A ferromagnetic core can increase the magnetic field and inductance of a coil by hundreds
Electromagnetic_coil
Passive two-terminal electrical component that stores energy in its magnetic field
20 H. Many inductors have a magnetic core made of iron or ferrite inside the coil, which serves to increase the magnetic field and thus the inductance
Inductor
Portable drilling machine with a magnetic base
pacemakers or other medical implants must not use this magnetic drilling machine.[1] Generally, a magnetic core drilling machine is used on a ferrous material
Magnetic_drilling_machine
outer core: these convection currents are caused by heat escaping from the core, a natural process called a geodynamo. The magnitude of Earth's magnetic field
Earth's_magnetic_field
Component that stores information
are not random-access. Archaic synonyms for main memory include core (for magnetic-core memory) and store. Main memory operates at a high speed compared
Computer_memory
Property of electrical conductors
flowing through it. The electric current produces a magnetic field around the conductor. The magnetic field strength depends on the magnitude of the electric
Inductance
Innermost part of Earth, a solid ball of iron-nickel alloy
deduced mostly from measurements of seismic waves and Earth's magnetic field. The inner core is believed to be composed of an iron–nickel alloy with some
Earth's_inner_core
Class of physical phenomena
that occur through a magnetic field, which allows objects to attract or repel each other. Because both electric currents and magnetic moments of elementary
Magnetism
Form of computer memory
offered higher speeds than magnetic-core memory, bipolar DRAM could not compete with the lower price of the then-dominant magnetic-core memory. In 1966, Dr.
Random-access_memory
Magnetic core on which the windings of electric transformers and inductors are formed
In electronics, a ferrite core is a type of magnetic core made of ferrite on which the windings of electric transformers and other wound components such
Ferrite_core
Ability of magnetization
as unsaturated magnetic cores. Not only do these materials have nonlinear magnetic behaviour, but often there is significant magnetic hysteresis, so there
Permeability (electromagnetism)
Permeability_(electromagnetism)
Toroidal magnetic core comprised from the powder of multiple alloys
(MPP) core is a toroidal magnetic core comprised from the powder of multiple alloys. It is distributed with air gaps to help condense its magnetic field
Molypermalloy_powder_core
Device to couple energy between circuits
varying magnetic flux in the transformer's core, which induces a varying electromotive force (EMF) across any other coils wound around the same core. Electrical
Transformer
used to describe (mainly quantitatively) ferromagnetic materials, and magnetic cores. Hysteresis loop Induction B as function of field strength H for H varying
Ferromagnetic material properties
Ferromagnetic_material_properties
Feature of some magnetic materials
of magnetic flux necessary for high power production, they must have large magnetic cores. In applications in which the weight of magnetic cores must
Saturation_(magnetic)
Vacuum tube commercial computer, 1958
000-word, 24,000-digit magnetic-core storage unit. Each of the planes is divided into two sections of 50 by 40 cores, making 2,000 cores in each section. Each
UNIVAC_II
Reversal of direction of Earth's magnetic field
reversal is a change in the Earth's dipole magnetic field such that the positions of magnetic north and magnetic south are interchanged (not to be confused
Geomagnetic_reversal
Type of electrical device
magnetic cores with a toroidal (ring or donut) shape. They are passive electronic components, consisting of a circular ring or donut-shaped magnetic core
Toroidal inductors and transformers
Toroidal_inductors_and_transformers
Electromechanical valve
passing electric current through a coil of wire, which creates a magnetic field. The magnetic field attracts a plunger, which operates the valve mechanism
Solenoid_valve
Loops of electric current induced within conductors by a changing magnetic field
machinery, requiring special construction such as laminated magnetic cores or ferrite cores to minimize them. Eddy currents are also used to heat objects
Eddy_current
Cobalt-iron alloy
saturation in a magnetic core is that it can function at higher magnetic field strengths, so the core can be smaller and lighter for a given magnetic flux and
Permendur
Data storage device
offered improved performance over magnetic-core memory, it could not compete with the lower price of magnetic-core memory, which remained dominant up
Semiconductor_memory
probably acts to stabilize the magnetic field generated by the liquid outer core. The average magnetic field in Earth's outer core is estimated to measure 2
Internal_structure_of_Earth
Closed loop path containing a magnetic flux
path by magnetic cores consisting of ferromagnetic materials like iron, although there may be air gaps or other materials in the path. Magnetic circuits
Magnetic_circuit
Electromagnet used to generate a magnetic field in an electro-magnetic machine
machine, the field coils are wound on an iron magnetic core which guides the magnetic field lines. The magnetic core is in two parts; a stator which is stationary
Field_coil
Variant of magnetic-core computer memory
Plated-wire memory is a variation of magnetic-core memory developed by Bell Laboratories in 1957. Its primary advantage was that it could be assembled
Plated-wire_memory
Type of variable reactance inductor
reactor in electrical engineering is a special form of inductor where the magnetic core can be deliberately saturated by a direct electric current in a control
Saturable_reactor
Magnetic path length (MPL) is the effective length of a closed magnetic loop inside a magnetic core made of ferromagnetic material which may be also gapped
Magnetic_path_length
Early vacuum-tube computer system
switch to magnetic-core memory instead. The fourteenth 702 was built using magnetic-core memory, and the others were retrofitted with magnetic-core memory
IBM_702
Chinese-American businessman and computer engineer
machines. An Wang was an important contributor to the development of magnetic-core memory. A native of Kunshan County in Suzhou (Soochow) Prefecture, he
An_Wang
Type of computer memory
first product, Intel 3101, a SRAM memory chip intended to replace bulky magnetic-core memory modules; Its capacity was 64 bits and was based on bipolar junction
Static_random-access_memory
Topics referred to by the same term
Look up -core or core in Wiktionary, the free dictionary. Core or cores may refer to: Core (anatomy), everything except the appendages Core (laboratory)
Core
(1957) used magnetic-core memory. It went on to dominate the field into the 1970s, when it was replaced with semiconductor memory. Magnetic core peaked in
History_of_computing_hardware
Production of voltage by a varying magnetic field
induction or magnetic induction is the production of an electromotive force (emf) across an electrical conductor in a changing magnetic field. Michael
Electromagnetic_induction
Inductor used as a low-pass filter
choke usually consists of a coil of insulated wire often wound on a magnetic core, although some consist of a doughnut-shaped ferrite bead strung on a
Choke_(electronics)
Topics referred to by the same term
Look up core memory in Wiktionary, the free dictionary. Core memory or magnetic-core memory, is a form of random access computer memory used by computers
Core_memory_(disambiguation)
Guidance and navigation computer used in Apollo spacecraft
memory known as core rope memory, fashioned by weaving wires through and around magnetic cores, though a small amount of read/write core memory is available
Apollo_Guidance_Computer
Machine that converts electrical energy into mechanical energy
electromagnets (wire windings around a ferromagnetic iron core) or permanent magnets. These create a magnetic field that passes through the rotor armature, exerting
Electric_motor
Type of computer memory
improved performance over magnetic-core memory, bipolar DRAM could not compete with the lower price of the then-dominant magnetic-core memory. Capacitors had
Dynamic_random-access_memory
Electromagnetic device
saturable reactor. It makes use of magnetic saturation of the core, a non-linear property of a certain class of transformer cores. For controlled saturation characteristics
Magnetic_amplifier
Type of electromagnet formed by a coil of wire
than its diameter, which generates a controlled magnetic field. The coil can produce a uniform magnetic field in a volume of space when an electric current
Solenoid
Recording of information in a storage medium
the core functions of a general-purpose computer. Electronic documents can be stored in much less space than paper documents. Barcodes and magnetic ink
Data_storage
American engineer, inventor, and scientist
American engineer, inventor, scientist, teacher of magnetics and computing. He invented magnetic core memory that was addressable by content rather than
Robert_S._Singleton
Property of space that quantifies the magnetic influence at a given location
electromagnetism, magnetic field is a physical property of space that quantifies the magnetic influence at a given location. Magnetic fields deflect moving
Magnetic_field
Earliest electronic computer design
access time of 2.5 milliseconds. Magnetic-core memory was patented by An Wang in 1951. Core uses tiny magnetic ring cores, through which wires are threaded
Vacuum-tube_computer
Storage of digital data readable by computers
tubes, or rotating magnetic drums as primary storage. By 1954, those unreliable methods were mostly replaced by magnetic-core memory. Core memory remained
Computer_data_storage
Fluid layer between Earth's solid inner core and its mantle
fluid of the outer core as the principal source of Earth's magnetic field. The average magnetic field strength in Earth's outer core is estimated to be
Earth's_outer_core
Vacuum-tube computer system (1954)
as the memory's word size. Changes from the 701 include the use of magnetic-core memory instead of Williams tubes, floating-point arithmetic instructions
IBM_704
Type of computer memory
early computers used magnetic drum, which was non-volatile as a byproduct of its construction. The industry moved to magnetic-core memory in the later
Non-volatile random-access memory
Non-volatile_random-access_memory
Univac computer introduced in 1953
upgraded by replacing the magnetic core with a commercial solid-state 16,384-word magnetic core system. An eight-unit magnetic tape system, a floating-point
UNIVAC_1103
Chinese engineer, computer scientist, and professor
ultra-small magnetic core, the precondition for the development of megacomputers. Later, under the guidance of Chen, the team carried out the magnetic core molding
Chen_Guangxi
digits. The addressable space was 32768 words. The maximum size of the magnetic core memory was 16383 words. The programmable program memory had a maximum
Z25_(computer)
Persistent computer data storage with no moving parts
used competing technology of electromechanical magnetic storage which uses moving media coated with magnetic material. Generally, SSS is much faster but
Solid-state_storage
Computer memory that does not lose its contents after being turned off
(e.g. disk storage, hard disk drives, optical discs, floppy disks, and magnetic tape), and early computer storage methods such as punched tape and cards
Non-volatile_memory
Recording of data on a magnetizable medium
Magnetic storage or magnetic recording is the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetisation in a magnetizable
Magnetic_storage
Univac computer introduced in 1958
three core types. The UNIVAC 1105 had either 8,192 or 12,288 words of 36-bit magnetic core memory, in two or three banks of 4,096 words each. Magnetic drum
UNIVAC_1105
without prefixes "Magnetic core storage units are available with capacities of either 4096 or 32768 core storage registers; or two magnetic core storage units
Timeline_of_binary_prefixes
Mechanism by which a celestial body generates a magnetic field
this magnetic field resulted from electric currents induced in the fluid outer core of the Earth. He revealed the history of the Earth's magnetic field
Dynamo_theory
Computer memory that loses its contents when unpowered
Punched tape (1725) Plugboard Drum memory (1932) Magnetic-core memory (1949) Plated-wire memory (1957) Core rope memory (1960s) Thin-film memory (1962) Disk
Volatile_memory
SI unit of inductance
arrangements of conductors, such as parallel wires, or a solenoid. A small air-core coil used for broadcast AM radio tuning might have an inductance of a few
Henry_(unit)
Form of non-volatile memory used in computers and other electronic devices
support. The Apollo Guidance Computer used core rope memory, programmed by threading wires through magnetic cores. The simplest type of solid-state ROM is
Read-only_memory
Early high speed computer memory
alternative to magnetic-core memory developed by Sperry Rand in a government-funded research project. Instead of threading individual ferrite cores on wires
Thin-film_memory
1984 video game
McIlroy at Bell Labs in 1961. The word "Core" in the name comes from magnetic-core memory, an obsolete random-access memory technology. This term was then
Core_War
2-D grid of wires where data is represented by the presence or absence of diodes at nodes
matrix or transistor matrix. These alternatives included magnetic core schemes such as core rope memory, which held the program of the Apollo Guidance
Diode_matrix
2003 film by Jon Amiel
Other incidents involving the Earth's magnetic field lead Josh and Dr. Conrad Zimsky to conclude the Earth's inner core has stopped rotating. To avoid exposure
The_Core
Discontinued computer memory type
Punched tape (1725) Plugboard Drum memory (1932) Magnetic-core memory (1949) Plated-wire memory (1957) Core rope memory (1960s) Thin-film memory (1962) Disk
3D_XPoint
Obsolete type of non-volatile computer memory
magnetic drums and delay-line memory systems. Bubble memory started out as a promising technology in the 1970s, offering performance similar to core memory
Bubble_memory
Snapshot of computer memory data
from magnetic-core memory, the principal form of random-access memory from the 1950s to the 1970s. The name has remained long after magnetic-core technology
Core_dump
American electrical engineer (1929–2025)
research assistantship in the MIT Digital Computer Laboratory, in the magnetic core memory group. The DCL was a division of the Servomechanisms Laboratory
Bernard_Widrow
Past magnetic field of the planet Mars
The magnetic field of Mars is the magnetic field once generated from Mars's interior. Mars no longer has a global magnetic field. However, Mars did power
Magnetic_field_of_Mars
16-bit minicomputer series
K words of magnetic-core memory as an option, one that practically everyone had to buy, bringing the system cost up to $7,995. This core memory board
Data_General_Nova
Electrical circuit coupling using induction
common axis, so the magnetic field of one coil passes through the other coil. Coupling can also be increased by a magnetic core of a ferromagnetic material
Inductive_coupling
Specialised type of magnetic core memory element
of magnetic core memory element in which each core had two holes, one for writing and another for reading. It had the unusual property that a core's state
Transfluxor
Door locking device
as a solenoid) produces a magnetic field. This works in free space, but if the solenoid is wrapped around a ferromagnetic core such as soft iron the effect
Electromagnetic_lock
Chinese digital electronic computer
complete. The 103 computer initially used magnetic drum memory, later adding magnetic core memory. With magnetic drum memory, the 103 computer operated at
DJS-1
Earth's magnetic pole in the Northern Hemisphere
Earth's magnetic north pole. The north magnetic pole moves over time according to magnetic changes and flux lobe elongation in the Earth's outer core. In
North_magnetic_pole
the early 1970s. This led to primary computer memory moving away from magnetic-core memory devices to solid-state static and dynamic semiconductor memory
History of computing hardware (1960s–present)
History_of_computing_hardware_(1960s–present)
Programmable machine that processes data
the development of MOS semiconductor memory, which replaced earlier magnetic-core memory in computers. The MOSFET led to the microcomputer revolution
Computer
Topics referred to by the same term
Allylescaline, a psychedelic drug AL, a measure of inductance in a magnetic core AL (automobile), a French hybrid car in 1907 Almanor Railroad (reporting
AL
First computer to use magnetic disk storage
the first commercial computer that used a moving-head hard disk drive (magnetic disk storage) for secondary storage. The system was publicly announced
IBM_305_RAMAC
Novel type of computer memory
16Mb of memory in storage size (density). Ferroelectric flash memory Magnetic-core memory MRAM nvSRAM Phase-change memory Programmable metallization cell
Ferroelectric_RAM
Small mainframe computer series (1960s)
transistors and 20,000 diodes. They used magnetic-core memory, and a standard 8 kiloword system held 186,000 magnetic cores. They weighed about 2,000 pounds (1
GE-200_series
Mid-1960s 16-bit computer series by Hewlett Packard
The original model, the 2116A built using integrated circuits and magnetic-core memory, was released in 1966. Over the next four years, models A through
HP_2100
American operations researcher
the first digital computers. There he is credited as a co-inventor of magnetic core memory, the predominant form of random-access computer memory during
Jay_Wright_Forrester
Vacuum-tube computer system
Reader/Recorder IBM 736 - Power Frame #1 IBM 737 - Magnetic Core Storage Unit (4096 words of 12 μs core memory) IBM 740 - Cathode Ray Tube Output Recorder
IBM_701
Concerns the armature and the field laminations of the magnetic core for the greatest magnetic attractions; Best means to achieve these results. U.S.
List_of_Nikola_Tesla_patents
Topics referred to by the same term
Magnetic memory may refer to: Magnetic storage, the storage of data on a magnetized medium Magnetic-core memory, an early form of random-access memory
Magnetic_memory
Resistance to magnetic flux
Magnetic reluctance, or magnetic resistance, is a concept used in the analysis of magnetic circuits. It is defined as the ratio of magnetomotive force
Magnetic_reluctance
Write-protected data storage device
rental of movies; and early non-volatile memory technologies such as magnetic-core memory and bubble memory, from which reading data also erased it. WORM
Write_once_read_many
Power loss in magnetic materials
the total power loss (core losses) per unit volume in magnetic materials when subjected to external sinusoidally varying magnetic flux. The equation is
Steinmetz's_equation
Type of computer memory
induced magnetic field is created at the junction, which the writable plate picks up. This pattern of operation is similar to magnetic-core memory, a
Magnetoresistive_RAM
Safety device for telephones
(signal off-hook to the central office). It is also made with a gapped magnetic core that is not used in normal transformers. A "dry" isolation transformer
Line_isolation_transformer
Data recording made of plastic film
Magnetic tape is a medium for magnetic storage made of a thin, magnetizable coating on a long, narrow strip of plastic film. It was developed in Germany
Magnetic_tape
Computer built using discrete transistors
1960s featured circuit boards filled with individual transistors and magnetic-core memory. These machines remained the mainstream design into the late
Transistor_computer
Vacuum tube computer developed by the MIT Servomechanisms Laboratory
use magnetic-core memory after it had been proven to work for some months of use on the Memory Test Computer (MTC). (The MTC received a new core stack
Whirlwind_I
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