Such computers are said to be word addressable and

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Unformatted text preview: in memory, or simply memory. 13. Any storage unit of a computer system i,s characterized and evaluated based on the following properties -storage capacity, access time, cost per bit of storage, volatile, random access. 14. A primary storage or main memory of a computer system is made up of several small storage areas called locations or cells. Each of these locations can store a fixed number of bits called word length of that particular memory. Each location can hold either a data item or an instruction, and its address remains the same regardless of its contents. The addresses normally start at 0 and the highest address equals the number of words that can be stored in the memory minus 1. 15. Data and instructions are moved to and from memory in bunches of word length. Therefore, even if the electronic circuits used are comparable in speed, machines having smaller word-length will be slower in operation than machines having larger word-length. 16. The main memory of some computers is designed to store a fixed number of characters (equal to its word length in bytes) in each numbered address location. Such computers are said to be word-addressable, and they employ a fixed-word-length memory approach. In these computers, storage space is always allocated in multiples of wordlength. In many computers, the main memory is also designed in such a way that each numbered address can only store a single character (A, B, 1, 2, +, -, etc.) Computers designed in this manner are said to be character-addressable and they employ a variableword-length memory approach. 17. The main memory capacity of large computer systems is normally more than small systems. This capacity is defined in terms of the number of bytes a computer system can store. Memory capacity of a computer system is normally stated in terms of kilobytes (KB) which is equal to 1024 (2 10) bytes of storage, or in terms of megabytes (MB) which is equal to 1,048,576 (220) bytes of storage, or in terms of gigabytes (GB) which is equal to 1,073,741,824 (230) bytes of storage. 18. A computer's main memory is built of volatile RAM chips...
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