What is the function of the ALU? Which component in the von Neumann architecture acts as the stage manager. Explain. Punched cards and paper tape were early input/output mediums. Discuss their...

What is the function of the ALU? Which component in the von Neumann architecture acts as the stage manager. Explain. Punched cards and paper tape were early input/output mediums. Discuss their advantages and disadvantages. What is an instruction register? What is its function? What is a program counter? What is its function?