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・ btb
・ btoa
・ btos
・ btrieve
・ btrieve technologies, inc.
・ btrl
・ bts
・ btw
・ buaf
・ buag
bubble memory
・ bubble sort
・ bucky bits
・ buffer
・ buffer overflow
・ buffer overrun
・ buffered write-through
・ bug
・ bug fix
・ bug fix release


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bubble memory : FOLDOC
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 , Appendix C]
(1995-02-03)



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