COS151 Semester Test 1 Preparation – Theory Questions & Answers (100% Verified)

COS151 Semester Test 1 Preparation – Theory Questions & Answers (100% Verified) COS151 Semester Test 1 Preparation – Theory Questions & Answers (100% Verified) Define a computer based on the Turing Model. - ANSWER - Turing proposed that all kinds of computation could be performed by a special kind of a machine. He based the model on the actions that people perform when involved in computation. He abstracted these actions into a model for a computational machine that has really changed the world. Define a computer based on the von Neumann model. - ANSWER - The von Neumann model defines a computer as four subsystems: memory, arithmetic logic unit, control unit and input/output. The von Neumann model states that the program must be stored in memory. What is the role of a program in a computer that is based on the Turing model? - ANSWER - Based on the Turing model a program is a set of instruction that tells the computer what to do. What is the role of a program in a computer that is based on the von Neumann model? - ANSWER - Based on the von Neumann model a program is a set of instruction that is stored in memory and sequentially tells the computer what to do. What are the various subsystems of a computer? - ANSWER - The subsystems of the von Neumann model are memory, the arithmetic/logic unit (ALU), the control unit, and the input/output What is the function of the memory subsystem in a computer? - ANSWER - Memory is the storage area. This is where programs and data are stored during processing. What is the function of the ALU subsystem in a computer? - ANSWER - The arithmetic logic unit (ALU) is where calculations and logical operations take place. What is the function of the control unit subsystem in a computer? - ANSWER - The control unit controls the operations of the memory, ALU, and the input/output subsystem. What is the function of the input/output subsystem in a computer? - ANSWER - The input subsystem accepts input data and the program from outside the computer, while the output subsystem sends the result of processing the outside world.