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2 definitions found
 for random-access memory
From WordNet (r) 3.0 (2006) :

  random-access memory
      n 1: the most common computer memory which can be used by
           programs to perform necessary tasks while the computer is
           on; an integrated circuit memory chip allows information to
           be stored or accessed in any order and all storage
           locations are equally accessible [syn: random-access
           memory, random access memory, random memory, RAM,
           read/write memory]

From The Free On-line Dictionary of Computing (30 December 2018) :

  random-access memory
  RAM
  
      (RAM) (Previously "direct-access memory").  A data
     storage device for which the order of access to different
     locations does not affect the speed of access.  This is in
     contrast to, say, a magnetic disk, magnetic tape or a
     mercury delay line where it is very much quicker to access
     data sequentially because accessing a non-sequential location
     requires physical movement of the storage medium rather than
     just electronic switching.
  
     In the 1970s magnetic core memory was used and some
     old-timers still call RAM "core".  The most common form of RAM
     in use today is semiconductor integrated circuits, which
     can be either static random-access memory (SRAM) or dynamic
     random-access memory (DRAM).
  
     The term "RAM" has gained the additional meaning of
     read-write.  Most kinds of semiconductor read-only memory
     (ROM) are actually "random access" in the above sense but are
     never referred to as RAM.  Furthermore, memory referred to as
     RAM can usually be read and written equally quickly
     (approximately), in contrast to the various kinds of
     programmable read-only memory.  Finally, RAM is usually
     volatile though non-volatile random-access memory is also
     used.
  
     Interestingly, some DRAM devices are not truly random access
     because various kinds of "{page mode" or "column mode" mean
     that sequential access is faster than random access.
  
     The humorous expansion "Rarely Adequate Memory" refers to the
     fact that programs and data always seem to expand to fill the
     memory available.
  
     (2007-10-12)
  

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