<b>Core</b> <b>memory< - CompWisdom
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Topic: <b>Core</b> <b>memory<



  
 Magnetic <<b>bb>>coreb>bb>> memory - Wikipedia, the free encyclopedia
An example of this is the <<b>bb>>coreb>bb>> memory used by Digital Equipment Corporation for their PDP-1 computer; this strategy continued through all of the follow-on <<b>bb>>coreb>bb>> memory systems built by DEC for their PDP line of air-cooled computers.
Early <<b>bb>>coreb>bb>> memory systems had cycle times of about 6 µs, which had fallen to 1.2 µs by the early 1970s, and by the mid-70s it was down to 600 ns (0.6 µs).
Examples of this are the heated air <<b>bb>>coreb>bb>> memory of the IBM 1620 (which could take up to 30 minutes to reach operating temperature, about 106 °F, 41 °C) and the heated oil bath <<b>bb>>coreb>bb>> memory of the IBM 709, IBM 7090, and IBM 7030.
http://en.wikipedia.org/wiki/Core_memory   (1908 words)

  
 <<b>bb>>Coreb>bb>> memory
The first commercial computer with a <<b>bb>>coreb>bb>> memory (100.000 bits, cycle time 17 microseconds) was the IBM 705, a vacuum tube based computer delivered in 1955.
The invention of <<b>bb>>coreb>bb>> memory is ascribed both to A. Wang (working at the Harvard Computing Laboratory with H. Aiken) and W. Papian (working with J.W. Forrester at MIT in Project Whirlwind).
<<b>bb>>Coreb>bb>> memory was used first in the Whirlwind computer besides Williams tubes.
http://www.science.uva.nl/faculteit/museum/CoreMemory.html   (643 words)

  
 <<b>bb>>Coreb>bb>> - Wikipedia, the free encyclopedia
<<b>bb>>Coreb>bb>> memory or storage is memory made of magnetic toruses.
<<b>bb>>CoREb>bb>> is also an acronym for Computers, Robotics, Engineering, a Shared Learning Environment at Binghamton University.
In this sense, a <<b>bb>>coreb>bb>> is the scarred nucleus resulting from the detachment of one or more lithic flakes from a lump of source material or tool stone, usually by using a hard hammer percussor such as a hammerstone.
http://en.wikipedia.org/wiki/Core   (631 words)

  
 Random access memory - Wikipedia, the free encyclopedia
<<b>bb>>Coreb>bb>> memory, which used wires attached to small ferrite electromagnetic cores, also had roughly equal access time (the term “<<b>bb>>coreb>bb>>” is still used by some programmers to describe the RAM main memory of a computer).
The basic concepts of tube and <<b>bb>>coreb>bb>> memory are used in modern RAM implemented with integrated circuits.
The term "memory wall," first officially coined in Hitting the Memory Wall: Implications of the Obvious (pdf), refers to the growing disparity between CPU and memory speed.
http://en.wikipedia.org/wiki/Random_access_memory   (1137 words)

  
 Developing with <<b>bb>>Coreb>bb>> Data
It allows <<b>bb>>Coreb>bb>> Data to efficiently optimize the objects that are loaded into memory and leave unused data on disk.
All changes to the objects managed by <<b>bb>>Coreb>bb>> Data happen in memory and are transient until they are committed to disk.
In down-to-earth terms, this means that <<b>bb>>Coreb>bb>> Data organizes the application's model layer into a set of defined in-memory data objects.
http://developer.apple.com/macosx/coredata.html   (2428 words)

  
 Magnetic <<b>bb>>coreb>bb>> memory - Wikipedia, the free encyclopedia
Two key inventions led to the development of magnetic <<b>bb>>coreb>bb>> memory, which enabled the development of computers as we know them.
Early <<b>bb>>coreb>bb>> memory systems had cycle times of about 6 s, which had fallen to 1.2s by the early 1970s, and by the mid-70s it was down to 600 ns (0.6s).
Examples of this are the heated air <<b>bb>>coreb>bb>> memory of the IBM 1620 (which could take up to 30 minutes to reach operating temperature, about 106F, ~41C) and the heated oil bath <<b>bb>>coreb>bb>> memory of the IBM 709.
http://www.wikipedia.org/wiki/Core_memory   (2428 words)

  
 [H] Enthusiast - [H]arder than ever.
Instead of two processor cores being saddled to one bus and run to a single memory controller as we see with Intel dual <<b>bb>>coreb>bb>> technology, we have to remember that AMD Athlon 64 processors have the memory controller on the CPU die itself and therefore no “front side bus” is needed.
Also, each CPU <<b>bb>>coreb>bb>> has its own 1MB of full speed L2 cache and the L1 caches are of course independent as well.
A look at what AMD's new dual <<b>bb>>coreb>bb>> 4800+ processor is going to bring to your computing table.
http://www.hardocp.com/article.html?art=NzY2   (988 words)

  
 Encyclopedia article: <<b>bb>>Coreb>bb>> dump
A <<b>bb>>coreb>bb>> dump is an unstructured record of the contents of working memory (An electronic memory device) at a specific time, generally used to debug (additional info and facts about debug) a program that has terminated abnormally (crashed).
The paper form of dump generally was arranged in columns of hexadecimal (additional info and facts about hexadecimal) numbers (a "hex dump"), sometimes with alternate interpretations of memory contents along the side: as machine language instructions, as text strings, as decimal numbers, as floating-point numbers, etc.
<<b>bb>>Coreb>bb>> dumps are a useful debugging aid in several situations.
http://www.absoluteastronomy.com/encyclopedia/c/co/core_dump.htm   (416 words)

  
 Computer storage - Wikipedia, the free encyclopedia
In early computers, magnetic storage was also used for primary storage in a form of magnetic drum, or <<b>bb>>coreb>bb>> memory, <<b>bb>>coreb>bb>> rope memory, thin film memory, twistor memory or bubble memory.
Computer storage, or computer memory, refers to the computer components, devices and recording media that retain binary information for some interval of time.
In casual language, memory usually refers to forms of storage which are fast, but lose their contents in a case of power loss, and storage refers to forms of storage which are slower, but suitable for long-term retention.
http://en.wikipedia.org/wiki/Computer_storage   (2035 words)

  
 Historical, nonmechanical memory technologies - Chapter 15: DIGITAL STORAGE (MEMORY) - Volume IV - Digital
<<b>bb>>Coreb>bb>> memory was used from the 1960's until the late 1970's in many computer systems, including the computers used for the Apollo space program, CNC machine tool control computers, business ("mainframe") computers, and industrial control systems.
Jay Forrester of MIT applied this principle in inventing the magnetic "<<b>bb>>coreb>bb>>" memory, which became the dominant computer memory technology during the 1970's.
Bubble memory took advantage of a peculiar phenomenon in a mineral called garnet, which, when arranged in a thin film and exposed to a constant magnetic field perpendicular to the film, supported tiny regions of oppositely-magnetized "bubbles" that could be nudged along the film by prodding with other external magnetic fields.
http://www.allaboutcircuits.com/vol_4/chpt_15/4.html   (2054 words)

  
 <<b>bb>>coreb>bb>> dump - definition of <<b>bb>>coreb>bb>> dump in Encyclopedia
A <<b>bb>>coreb>bb>> dump is a file containing the contents of memory at the time a program or computer crashed.
A dump is to transfer the content of the memory verbatim to record the state of the computer.
In modern times, a <<b>bb>>coreb>bb>> dump file can be analyzed by a debugger program to provide such information as what values were assigned to variables, what was allocated on the stack, and (if appropriate debugging information was included by the compiler) what line of the program's source code the crash occurred at.
http://encyclopedia.laborlawtalk.com/core_dump   (238 words)

  
 bobeck.txt
Ferrite cores were good, but there had to be a better memory, one that wasn't so big, one that might be faster and, in time, one that might be cheaper.
http://www.eetonline.com/special/special_issues/millennium/milestones/bobeck.html EE Times Online The Century of the Engineer: Misunderstood Milestones Bubbles: the better memory by George Rostky Andrew Bobeck was out to challenge the entrenched memories of the late 1960s, ferrite cores and drums.
He had worked on ferrite - <<b>bb>>coreb>bb>> memories and had designed the first ferrite-<<b>bb>>coreb>bb>> memory to be driven by transistors rather than bulky, fragile, heat-emitting and short-lived vacuum tubes.
http://starfish.osfn.org/rcs/bubble/bobeck.txt   (238 words)

  
 Bubble memory - Wikipedia, the free encyclopedia
The first was the development of the first magnetic <<b>bb>>coreb>bb>> memory system driven by a transistor -based controller, and the second was the development of Twistor memory.
Twistor memory was based on magnetostriction, an effect which can be used to move magnetic fields.
Bubble memory is a type of computer memory that uses a thin film of a magnetic material to hold small magnetized areas, known as bubbles, which each store one
http://en.wikipedia.org/wiki/Bubble_memory   (238 words)

  
 Image - Wikipedia, the free encyclopedia
A <<b>bb>>coreb>bb>> image (or <<b>bb>>coreb>bb>> dump, from magnetic <<b>bb>>coreb>bb>> memory, the predominant RAM technology of the 1960s) is a faithful copy of the data stored in the main memory of a computer or process.
In this wider sense, images can also be produced manually, such as by drawing, painting, carving, by computer graphics technology, or a combination of the two, especially in a pseudo-photograph.
In computer graphics and digital image processing, the word image almost always means digital image or, by extension, any computer description of an image, e.g.
http://en.wikipedia.org/wiki/Image   (733 words)

  
 Computer storage - Wikipedia, the free encyclopedia
Historically, "memory" referred to "magnetic <<b>bb>>coreb>bb>> memory" in the 1950s, and then to semiconductor-based storage in the 1970s, at a time when the fastest response times were for magnetic <<b>bb>>coreb>bb>>, and then for semiconductor memory, respectively.
secondary (indirect) access by the CPU, which was based primarily on speed of access to the memory.
Primary storage can be used to refer to local random-access disk storage, which should properly be called secondary storage.
http://en.wikipedia.org/wiki/Computer_memory   (733 words)

  
 Random access memory - Wikipedia, the free encyclopedia
<<b>bb>>Coreb>bb>> memory, which used wires attached to small ferrite electromagnetic cores, also had roughly equal access time (the term “<<b>bb>>coreb>bb>>” is still used by some programmers to describe the RAM at the heart of a computer).
In today's computers memory access is becoming very slow when compared to CPU cycles since most computers use cheap, but comparatively slow, DRAM for the main memory.
One defining characteristic of RAM is that its accesses to different memory locations are almost always completed at about the same speed, in contrast to some other technologies that required a certain delay time for a bit or byte to “come around”.
http://en.wikipedia.org/wiki/Random_access_memory   (1009 words)

  
 Computer storage
Historically, "memory" referred to "magnetic <<b>bb>>coreb>bb>> memory" in the 1950s, and then to semiconductor-based storage in the 1970s, at a time when the fastest response times were for magnetic <<b>bb>>coreb>bb>>, and then for semiconductor memory, respectively.
The terms "storage" ( U.K) or "memory" ( U.S) refer to the parts of a digital computer that retain physical state ( data) for some interval of time, possibly even after electrical power to the computer is turned off.
Semiconductor memory (RAM) and magnetic disk are examples of this type of storage.
http://www.sciencedaily.com/encyclopedia/computer_storage_1   (1009 words)

  
 Flash memory - Wikipedia, the free encyclopedia
NAND flash memory forms the <<b>bb>>coreb>bb>> of the removable USB interface storage devices known as USB flash drives.
Flash memory is also used in USB flash drives, which are used for general storage and transfer of data between computers.
Flash memory costs far less than EEPROM and therefore has become the dominant technology wherever a significant amount of non-voltatile, solid-state storage is needed.
http://en.wikipedia.org/wiki/Flash_memory   (2022 words)

  
 magnetic bubble memory - definition of magnetic bubble memory in Encyclopedia
Bubble memory is a type of computer memory that uses a thin film of a magnetic material to hold small magnetized areas, known as bubbles, which each store one bit of data.
The first was the development of the first magnetic <<b>bb>>coreb>bb>> memory system driven by a transistor-based controller, and the second was the development of Twistor memory.
Bubble memory was a very promising technology in the 1970s, but flopped commercially when hard disks came to proliferate in the 80s.
http://encyclopedia.laborlawtalk.com/magnetic_bubble_memory   (881 words)

  
 Drum memory - LinuxQuestions.org Wiki
Drum memory was eventually replaced by <<b>bb>>coreb>bb>> memory when manufactoring of <<b>bb>>coreb>bb>> was sent overseas.
Drum memory was a form of computer memory used during the Bronze Age of computing.
In the Story of Mel, Mel used this property to avoid writting delay loops, by placing needed data in the most "pessimum" site on the drum, meaning that the computer had to wait for the data to be read.
http://wiki.linuxquestions.org/wiki/Drum_memory   (179 words)

  
 Athlon 64 and Opteron dual-<<b>bb>>coreb>bb>> explained
Where the execution units in a HyperThreading processor have to share the cache, in dual-<<b>bb>>coreb>bb>> chips, each <<b>bb>>coreb>bb>> has a separate cache, the only contention is when going to main memory.
Provided the level 2 cache is a decent size for each <<b>bb>>coreb>bb>>, that contention should be kept to a fairly low level.
In the firm's current processors, only <<b>bb>>coreb>bb>> 0 is present but, at the launch of the Athlon 64, AMD made a big deal of the fact that adding <<b>bb>>coreb>bb>> 1 would require minimal work.
http://www.theinquirer.net/?article=13344   (1117 words)

  
 AnandTech: Memory Section
With a memory voltage to 4.0V, the DFI nF4 offers new overclocking capabilities with OCZ VX and other DDR memory.
Corsair introduces a new DDR550 memory based on the legendary Samsung TCCD memory chips.
Problem upgrading DDR Memory in an older motherboard...
http://www.anandtech.com/memory   (658 words)

  
 Computer Memory
The development of <<b>bb>>coreb>bb>> memory was a spin off from the Whirlwind project.
When using a CRT tube as a memory device the operating voltages of the tube are adjusted to ensure maximum secondary emission - more electrons are emitted from the impact spot than are arriving in the primary electron beam and a small positive charge builds up in the area of the spot.
Magnetic <<b>bb>>coreb>bb>> memory was the invention of Jay W Forrester and was developed with the assistance of a graduate student - Kenneth Olsen.
http://www.arcula.demon.co.uk/bhist7.htm   (2533 words)

  
 NodeWorks - Encyclopedia: <<b>bb>>Coreb>bb>> War
<<b>bb>>Coreb>bb>> War programs (called "warriors") are assembled and executed by a program called a Memory Array Redcode Simulator (abbreviated to MARS).
"<<b>bb>>Coreb>bb>>" refers to magnetic <<b>bb>>coreb>bb>> memory, an obsolete technology.
<<b>bb>>Coreb>bb>> War (or <<b>bb>>Coreb>bb>> Wars, also Darwin) is a game consisting of battles between two or more assembly language programs occupying the same memory space in which the winner is the last one running.
http://pedia.nodeworks.com/C/CO/COR/Core_War   (473 words)

  
 Drum memory - Wikipedia, the free encyclopedia
Drums were later replaced by <<b>bb>>coreb>bb>> memory, which was faster and had no moving parts, and which lasted until semiconductor memory entered the scene.
Librascope LGP-30 – The drum memory computer referenced in the above story, also referenced on Librascope LGP-30.
They did this by carefully timing how long it would take for a particular instruction to run and the computer to ready itself to read the next instruction, then placing that instruction on the drum so that it was just arriving under the heads at that point in time.
http://en.wikipedia.org/wiki/Drum_memory   (401 words)

  
 NV20-5
But one must keep in mind that a video processor with advanced <<b>bb>>coreb>bb>> architecture always has the ability to manage memory bandwidth more efficiently and thus take on a better performance with the same memory bandwidth.
Video <<b>bb>>coreb>bb>> speed: The 3D rendering capacity of the fastest NVIDIA graphic processor has reached a value as high as 1000 mega pixels per second, however this fill rate is never seen actualised due to the acute CPU limitation or memory bandwidth encountered.
This is just the reason that without a advanced video <<b>bb>>coreb>bb>> why we can't make a great video card by only increasing its memory bandwidth, though that the memory bandwidth is the main factor that limits the performance of video cards today.
http://www.geocities.com/tnaw_xtennis/NV20-5.htm   (401 words)

  
 main memory Computer Encyclopedia Enterprise Resource Directory Complete Guide to Internet
A modern computer's main memory is built from {random access memory} {integrated circuits}.
Computers have several other sorts of memory, distinguished by their access time, storage capicity, cost, and the typical lifetime or rate of change of the data they hold.
In the old days {ferrite <<b>bb>>coreb>bb>> memory} was one popular form of main memory, leading to the use of the term "{<<b>bb>>coreb>bb>>}" for main memory.
http://jaysir.com/computer-encyclopedia/m/main-memory-computer-terms.htm   (136 words)

  
 Random access memory - Wikipedia, the free encyclopedia
<<b>bb>>Coreb>bb>> memory, which used wires attached to small ferrite electromagnetic cores, also had roughly equal access time (the term “<<b>bb>>coreb>bb>>” is still used by some programmers to describe the RAM main memory of a computer).
The basic concepts of tube and <<b>bb>>coreb>bb>> memory are used in modern RAM implemented with integrated circuits.
A four-megabyte RAM hiyaacard for the VAX 8600 computer (circa 1986).
http://en.wikipedia.org/wiki/Random_access_memory   (1115 words)

  
 corewars
One of the simplest <<b>bb>>Coreb>bb>> Wars programs is this one, from the original Scientific American article: ; Imp, by A. Dewdney imp MOV 0, 1 ; This program copies itself ahead one END ; instruction and moves through memory.
The memory in the <<b>bb>>Coreb>bb>> Wars computer begins initialized to a particular value.
<<b>bb>>Coreb>bb>> Wars is a game of battling computer programs.
http://www.pbm.com/~lindahl/pbem_articles/corewars   (945 words)

  
 Virtual Memory Definition
Virtual memory was incorporated into the UNIX kernel (i.e., the <<b>bb>>coreb>bb>> of the operating system) in the 1970s as part of the Berkeley Extensions, which were developed at the University of California at Berkeley (UCB).
Virtual memory is so important that its acronym, i.e., vm, was incorporated into the name of the Linux kernel as it is used on most systems, i.e., vmlinux for the non-compressed version and vmlinuz for the compressed, bootable (i.e., runnable) version.
Virtual memory permits software to run in a memory space (i.e., a logical memory) whose size is greater than the computer's RAM.
http://www.bellevuelinux.org/virtual.html   (806 words)

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