Von neumann

Computer Science preparatory

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.​

Von Neumann architecture

is computer architecture design consists of a Control Unit, Arithmetic and Logic Unit (ALU), Memory Unit, Registers and Inputs/Outputs.

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Von Neumann architecture

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.

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Sequence

Multiple Choice

What does CPU stand for?

• Central Processing Unit

• Cool Pokemon Unit

• Computer Protocol User

• Computer Processing Unit

Open Ended

A bus station has a ticket machine.

A customer can use the ticket machine to select and pay for their ticket.

One input device built into the ticket machine is a touch screen.

(a) Identify two other input devices that could be built into the ticket machine.

Input device 1 ...........................................................................................................................

Input device 2 ..........................................................................................................................

Multiple Choice

What is the purpose of the memory address register?

• It memorises everything

• It holds the instructions to be carried out by the CPU

• It keeps track of the instructions

• It allows you to input something

Open Ended

The ticket machine has a help icon that a user can touch to contact customer support.

The ticket machine has an output device that allows the user to hear the customer support person.

Identify an output device that would be used for this purpose. .............................................................................................................................................

These are the devices in charge of entering and outputing the information from the device.

Input/Output

The Central Processing Unit (CPU) is the electronic circuit responsible for executing the instructions of a computer program.

CPU

Registers are high speed storage areas in the CPU.  All data must be stored in a register before it can be processed.

Memory

Multiple Choice

What is the main purpose of the CPU?

• To Fetch, Decode and Execute Instructions (in MEMORY).

• To perform calculations.

• To render graphics on a screen.

• To manage the computer system.

Multiple Select

Tick all options that happen in the FETCH CYCLE?

• PC is incremented

• The PC value is copied to the MAR

• The Instruction at the MAR address is read from RAM

• The instruction in the MAR is decoded

Multiple Choice

Tick all options that happen in the DECODE CYCLE?

• The instruction in the MAR is decoded by the CU

• The Instruction at the MAR address is read from RAM

• PC is incremented

• The PC value is copied to the MAR

Multiple Select

Tick all options that happen in the EXECUTE CYCLE?

• The data at the MAR address is read from RAM

• The ALU performs any calculations required on the ACC

• The value in the MDR is written to the address in the MAR.

• The instruction in the IR is decoded by the CU

Multiple Select

Increasing which of these can improve system performance? (Tick all that apply)

• Cache Size

• System Clock Speed

• Primary Memory (RAM)

• Number of Cores

• Address bus width

Multiple Select

Which of these are REGISTERS in the CPU? (Tick ALL that are correct)

• Accumulator

• Program Counter

• Control Bus Register

• Memory Address Register

• ALU

Multiple Choice

Which of these best defines an embedded system?What is the main feature of the von Neumann Computer architecture?

• A dedicated computer system built into a device

• A portable computer system

• A general purpose computer system

• A computer system

Multiple Choice

What is the main feature of the von Neumann Computer architecture?

• There is a single PRIMARY MEMORY for both data and instructions.

• The instructions are stored in PRIMARY MEMORY

• The model as a single CPU

• Data is stored in SECONDARY STORAGE

Multiple Choice

Data and instructions are transferred from these devices.

• CPU

• Input devices

• Main memory

• Only programs

Multiple Choice

Secondary storage devices can be grouped into three categories - what are they?

• Magnetic, Flash and Optical

• Solid State, Flash and Hard Drives

• Magnetic, Optical and Solid State

• Hard Drives, CDs and USBs

Multiple Choice

Which of the following is an example of 'main memory'.

• RAM

• Hard Drive

• USB Drive

• ROM

Multiple Choice

What is a bus?

• A circuit that connect one part of CPU to other components.

• A type of permanent memory

• A type of long term memory

• A method of transport

Multiple Choice

Which of the followings is not a processing unit?

• CPU

• Mainboard

• RAM

• Hard disk