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1. devices /systems that store digital info in large quantitymemories
2. concerned only with digital memories.
3. magnetic core and moving surface memories not included
3. memory represented in terms of bit, byte, kilobyte, etc.
4. each byte word stored in a particular location identified by a unique address.
5. single byte world at one unique address is stored or retrieved in each cycle of memory operation.
6. main aim:
a. is to reduce cost per memory bit.
b. achieve high density, low power consumption & fast memory.
1. RAM
a. static RAM
b. dynamic RAM
2. ROM

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