The correct matching for the following pairs is (A) DMA I/O (1) High speed RAM…

1997

The correct matching for the following pairs is 

(A) DMA I/O                    (1) High speed RAM

(B) Cache                      (2) Disk

(C) Interrupt I/O              (3) Printer

(D) Condition Code Register    (4) ALU

Answer: B. ( A - 2 , B - 1 , C - 3 , D - 4 ) — Step-by-Step Match Analysis(A) DMA I/O ⟹ (2) Disk Reason: Direct Memory Access (DMA) is a technique used for high-speed data transfer between fast I/O devices…

  1. A.

    ( A - 4 , B - 3, C - 1, D - 2 )

  2. B.

    ( A - 2 , B - 1 , C - 3 , D - 4 )

  3. C.

    ( A - 4 , B -3, C - 2, D- 1 )

  4. D.

    ( A - 2, B - 3, C - 4 , D- 1 )

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Correct answer: B

Step-by-Step Match Analysis

  • (A) DMA I/O ⟹ (2) Disk

    • Reason: Direct Memory Access (DMA) is a technique used for high-speed data transfer between fast I/O devices and main memory without continuous CPU intervention. Hard disks or solid-state drives (Disks) transfer large blocks of data rapidly, making them the classic use case for a DMA controller.

  • (B) Cache ⟹ (1) High speed RAM

    • Reason: Cache memory is a small, ultra-fast type of volatile memory built directly into or very close to the CPU. It is implemented using Static RAM (SRAM), which functions as a high-speed RAM to store frequently accessed instructions and data.

  • (C) Interrupt I/O ⟹ (3) Printer

    • Reason: Printers are relatively slow mechanical output devices. Instead of making the fast CPU waste cycles waiting for the printer to finish printing a page (polling), Interrupt-driven I/O is used. The CPU sends the data and moves on to other tasks; the printer alerts the CPU via an interrupt signal only when it is ready for the next batch of data.

  • (D) Condition Code Register ⟹ (4) ALU

    • Reason: The Condition Code Register (also known as the Status Register or Flag Register) contains flags like Zero (Z), Sign (S), Carry (C), and Overflow (V). These flags are directly updated based on the arithmetic or logical results produced by the Arithmetic Logic Unit (ALU) after an execution.

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