A special purpose register that contains data to be written into or readout of the addressed locatio...........

Computer GK ( CHSL) Input and Output devices

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A special-purpose register that contains data to be written into or readout of the addressed location is known as

index register

memory address register

memory data register

ALU

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Explanation:

- Memory Data Register (Option 3): This register holds data that is either being read from or written to memory. It's crucial for data transfer between CPU and memory.

- Index Register (Option 1): This register is used to modify operand addresses during program execution, but it doesn’t directly handle data read/write.

- Memory Address Register (Option 2): This register holds memory addresses, allowing the CPU to access data in specific locations. It doesn't store the data itself.

- ALU (Option 4): The Arithmetic Logic Unit performs mathematical and logical operations, not direct data storage.