bubble memory - definition. What is bubble memory
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%ما هو (من)٪ 1 - تعريف

TYPE OF NON-VOLATILE COMPUTER MEMORY
Magnetic bubble memory; Magnet bubble memory; GGGQEP
  • Bubble memory driver coils/windings/field coils and guides (T bar guides in this case); the guides or propagation elements, are on top of a magnetic film, which is on top of a substrate chip. This is mounted to a PCB (not shown) and then surrounded by two windings.
  • Intel 7110 magnetic-bubble memory module

bubble memory         
A storage device built using materials such as gadolinium gallium garnet which are can be magnetised easily in only one direction. A film of these materials can be created so that it is magnetisable in an up-down direction. The magnetic fields tend to join together, some with the north pole facing up, some with the south. When a veritcal magnetic field is imposed on this, the areas in opposite alignment to the field shrink to circles, or 'bubbles'. A bubble can be formed by reversing the field in a small spot, and can be destroyed by increasing the field. Bubble memory is a kind of non-volatile storage but EEPROM, Flash Erasable Programmable Read-Only Memory and ferroelectric technologies, which are also non-volatile, are faster. ["Great Microprocessors of the Past and Present", V 4.0.0, John Bayko <bayko@hercules.cs.uregina.ca>, Appendix C] (1995-02-03)
Bubble memory         
Bubble memory is a type of non-volatile computer memory that uses a thin film of a magnetic material to hold small magnetized areas, known as bubbles or domains, each storing one bit of data. The material is arranged to form a series of parallel tracks that the bubbles can move along under the action of an external magnetic field.
Bubble chart         
  • Bubble chart displaying the relationship between poverty and violent and property crime rates by state. Larger bubbles indicate higher percentage of state residents at or below the poverty level. Trend suggests higher crime rates in states with higher percentages of people living below the poverty level.
  • Circular Packing chart, sometimes called a "bubble chart," showing the proportions of professions of people who create programming languages
  • A series of bubbles on a [[map]] is called a [[proportional symbol map]] or sometimes "bubble map"
CHART
Bubble plot; Bubble charts
A bubble chart is a type of chart that displays three dimensions of data. Each entity with its triplet (v1, v2, v3) of associated data is plotted as a disk that expresses two of the vi values through the disk's xy location and the third through its size.

ويكيبيديا

Bubble memory

Bubble memory is a type of non-volatile computer memory that uses a thin film of a magnetic material to hold small magnetized areas, known as bubbles or domains, each storing one bit of data. The material is arranged to form a series of parallel tracks that the bubbles can move along under the action of an external magnetic field. The bubbles are read by moving them to the edge of the material, where they can be read by a conventional magnetic pickup, and then rewritten on the far edge to keep the memory cycling through the material. In operation, bubble memories are similar to delay-line memory systems.

Bubble memory started out as a promising technology in the 1970s, offering memory density of an order similar to hard drives, but performance more comparable to core memory, while lacking any moving parts. This led many to consider it a contender for a "universal memory" that could be used for all storage needs. The introduction of dramatically faster semiconductor memory chips pushed bubble into the slow end of the scale, and equally dramatic improvements in hard-drive capacity made it uncompetitive in price terms. Bubble memory was used for some time in the 1970s and 1980s where its non-moving nature was desirable for maintenance or shock-proofing reasons. The introduction of flash storage and similar technologies rendered even this niche uncompetitive, and bubble disappeared entirely by the late 1980s.