JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD MCA 2020 COMPUTER ORGANIZATION Previous Question Paper (January - 2020 - R15)

i) To convert the decimal number 5647 to BCD, each digit is represented by its 4-bit binary equivalent: 5 is 0101, 6 is 0110, 4 is 0100, and 7 is 0111. Thus, the BCD representation is 0101 0110 0100 0111.

ii) To convert to Excess-3 code, add 3 to each decimal digit and convert the result to a 4-bit binary code: 5+3=8 (1000), 6+3=9 (1001), 4+3=7 (0111), and 7+3=10 (1010). Thus, the Excess-3 representation is 1000 1001 0111 1010.

Locality of reference is the tendency of a processor to access the same set of memory locations repetitively over a short period of time. It is categorized into two types: Temporal locality, where a recently accessed memory location is likely to be accessed again soon, and Spatial locality, where memory locations physically close to the recently accessed location are likely to be accessed next. This principle is fundamental to the effective use of cache memory.