A computer program consists of instructions and data on which the instruction operates. How are these instructions of a program executedby a computer? Where are these instructions and data stored during execution? What is the role played by Input/output devices?

When a computer program is executed, the instructions are processed by the computer's central processing unit (CPU) in a series of steps known as the instruction cycle. The instructions and data required for execution are stored in various components of the computer system, including primary memory and secondary storage devices. Input/output (I/O) devices facilitate the interaction between the computer and the external world, enabling the transfer of data to and from the computer.

Here's a breakdown of the execution process, storage locations, and the role of I/O devices:

1. Execution of Instructions:

   • Fetch: The CPU fetches the next instruction from memory. The program counter (PC) holds the address of the next instruction to be fetched.
   • Decode: The fetched instruction is decoded to determine the operation to be performed and the operands involved.
   • Execute: The CPU performs the operation specified by the instruction, manipulating data in registers or accessing memory locations.
   • Store: The result of the executed instruction may be stored back in a register or memory location.

2. Storage of Instructions and Data:

   • Primary Memory (RAM): Instructions and data that are actively being used during program execution are stored in primary memory, typically random-access memory (RAM). RAM provides fast access to data and instructions, allowing the CPU to read and write information quickly. The content in RAM is volatile and is lost when the computer is powered off.
   • Cache Memory: To reduce the CPU's access time to instructions and data, modern computers employ cache memory. Cache memory is a small, high-speed memory located close to ______ _____ ____ __________ __________ ________ ____.
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