Which of the following is/are the basic units of IAS computer?

Explanation

The modern computers are based on a stored-program concept introduced by John Von Neumann. In this stored-program concept, programs and data are stored in a separate storage unit called memories and are treated the same It is also known as IAS computer Central Processing Unit (CPU) has two parts Control Unit : A control unit (CU) handles all processor control signals. Arithmetic and Logic Unit (ALU) : The arithmetic logic unit is that part of the CPU that handles all the calculations the CPU may need, e.g. Addition, Subtraction, Comparisons Main Memory Unit (Registers) Accumulator: Stores the results of calculations made by ALU. Program Counter (PC): Keeps track of the memory location of the next instructions to be dealt with. Memory Address Register (MAR): It stores the memory locations of instructions that need to be fetched from memory or stored into memory. Memory Data Register (MDR): It stores instructions fetched from memory or any data that is to be transferred to, and stored in, memory. Current Instruction Register (CIR): It stores the most recently fetched instructions while it is waiting to be coded and executed. Instruction Buffer Register (IBR): The instruction that is not to be executed immediately is placed in the instruction buffer register IBR. Input / Output Devices Program or data is read into main memory from the input device or secondary storage under the control of CPU input instruction. Output devices are used to output the information from a computer. If some results are evaluated by computer and it is stored in the computer, then with the help of output devices, we can present it to the user. Therefore All of the option is the correct answer i.e, Option 3