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gptkbp:instanceOf
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Computer Memory
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gptkbp:alsoKnownAs
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gptkb:Core_Memory
gptkb:Ferrite_Core_Memory
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gptkbp:bitRepresentation
|
Magnetic Polarity
|
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gptkbp:bitStorageMethod
|
Magnetization Direction
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gptkbp:capacity
|
Typically Kilobytes
|
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gptkbp:category
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gptkb:personal_computer
Data Storage
Historical Technology
Memory Technology
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gptkbp:component
|
gptkb:IBM_System/360
gptkb:Apollo_Guidance_Computer
gptkb:UNIVAC_computers
gptkb:DEC_PDP-8
|
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gptkbp:dataStorageType
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gptkb:SDRAM
Non-volatile
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|
gptkbp:declineEra
|
Late 1970s
|
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gptkbp:eraOfUse
|
1950s
1960s
1970s
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Magnetic Core Memory
|
|
gptkbp:introducedIn
|
1951
|
|
gptkbp:inventedBy
|
gptkb:An_Wang
gptkb:Jay_Forrester
|
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gptkbp:legacy
|
Influenced Modern RAM Design
|
|
gptkbp:maintenance
|
Manual Repair Possible
|
|
gptkbp:manufacturingFacilities
|
Labor Intensive
|
|
gptkbp:material
|
Ferrite Rings
|
|
gptkbp:obsoletes
|
Yes
|
|
gptkbp:powerSource
|
Retains Data Without Power
|
|
gptkbp:readBy
|
Destructive Readout
|
|
gptkbp:reliability
|
High
|
|
gptkbp:replacedBy
|
gptkb:Semiconductor_Memory
|
|
gptkbp:significance
|
First Widely Used RAM
|
|
gptkbp:size
|
Bulky
|
|
gptkbp:speed
|
Microseconds Access Time
|
|
gptkbp:structure
|
Grid of Wires and Cores
|
|
gptkbp:usedIn
|
gptkb:Mainframe_Computers
Minicomputers
Early Digital Computers
|
|
gptkbp:usedUntil
|
Mid-1970s
|
|
gptkbp:writeMethod
|
Current Pulses
|
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gptkbp:bfsParent
|
gptkb:US_Patent_2,649,311
|
|
gptkbp:bfsLayer
|
5
|