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Question 73Asked in BEL PE Computer Science, 20 Dec 2025 (5:00 PM)

A computer system has an 8-bit address bus. Addresses from 00000000 to 01111111 are used for memory, and addresses from 10000000 to 11111111 are used for…

A computer system has an 8-bit address bus. Addresses from 00000000 to 01111111 are used for memory, and addresses from 10000000 to 11111111 are used for I/O devices. If each memory location stores one 8-bit word, which of the following statements is true?
  1. AThe system can address 256 bytes of memory and 128 I/O ports.
  2. BThe system can address 128 words of memory and 256 I/O ports.
  3. CThe system can address 256 words of memory, all reserved for memory operations.
  4. DThe system can address a total of 128 bytes of memory and 128 I/O ports.
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Correct answer: (D) The system can address a total of 128 bytes of memory and 128 I/O ports.

From BEL PE Computer Science PYQ, 20 Dec 2025 (5:00 PM)

This is question 73 of BEL PE Computer Science PYQ, 20 Dec 2025 (5:00 PM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.