is CD ROM a primary memory or temporary memory?
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The computer memory is a data storing devices. There are many categories of memories: primary and secondary memory. RAM, ROM, registers, accumulator, floppy, hard disk, CD-ROM, magnetic tapes etc are example of computer memory. The processing capacity of computer not only depends on processor, but also on capacity of primary memory.
The evolution of computer from one generation to next generation show variation in the processing speed, storing capacity, reliability, power consumption, and size. A memory system can be logically divided into three categories: internal memory, main memory, and secondary memory.
Internal memory refers to the set of registers confined to the CPU. It holds temporary results when a computation is in progress. Because these registers and the CPU are fabricated with the same technology, there is no speed disparity between them but the cost factor limits the number of registers incorporated in the CPU.
A memory system may be centralized or distributed. In a centralized system, all processors that exist in a system can be share one common memory unit, which may be referred to as a tightly coupled system. The salient features of this system are as follows:
Inexpensive
Easy to control
High use of the available space.
In a distributed or loosely coupled system, each processor has a private or local memory as well as a common memory. The advantage of it is:
(i) Several memory units can be kept busy at the same time
(ii) Since each processor has its own private memory, they can be simultaneously engaged to perform local processing.
The evolution of computer from one generation to next generation show variation in the processing speed, storing capacity, reliability, power consumption, and size. A memory system can be logically divided into three categories: internal memory, main memory, and secondary memory.
Internal memory refers to the set of registers confined to the CPU. It holds temporary results when a computation is in progress. Because these registers and the CPU are fabricated with the same technology, there is no speed disparity between them but the cost factor limits the number of registers incorporated in the CPU.
A memory system may be centralized or distributed. In a centralized system, all processors that exist in a system can be share one common memory unit, which may be referred to as a tightly coupled system. The salient features of this system are as follows:
Inexpensive
Easy to control
High use of the available space.
In a distributed or loosely coupled system, each processor has a private or local memory as well as a common memory. The advantage of it is:
(i) Several memory units can be kept busy at the same time
(ii) Since each processor has its own private memory, they can be simultaneously engaged to perform local processing.
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