3.1. Computer architecture
A subsection of Computer Science, 2210, through 3. Hardware
Listing 10 of 31 questions
Name three different buses that are used in the fetch-execute cycle. Bus 1 ������������������������������������������������������������������������������������������������������������������������������������������������ Bus 2 ������������������������������������������������������������������������������������������������������������������������������������������������ Bus 3 ������������������������������������������������������������������������������������������������������������������������������������������������
2210_s17_qp_12
THEORY
2017
Paper 1, Variant 2
View
An alarm clock is controlled by a microprocessor. It uses the 24 hour clock. The hour is represented by an 8-bit register, A, and the number of minutes is represented by another 8-bit register, B. Identify what time is represented by the following two 8-bit registers. A B : Hours Minutes An alarm has been set for 07:30. Two 8-bit registers, C and D, are used to represent the hours and minutes of the alarm time. Show how 07:30 would be represented by these two registers: C D : Hours Minutes Describe how the microprocessor can determine when to sound the clock alarm. The LCD (liquid crystal display) on the clock face is back-lit using blue LEDs (light emitting diodes). The brightness of the clock face is determined by the level of light in the room. The amount of light given out by the LEDs is controlled by a control circuit. Describe how the sensor, microprocessor and LEDs are used to maintain the correct brightness of the clock face. Modern LCD monitors and televisions use LED back-lit technology. Give two advantages of using this new technology compared to the older cold cathode fluorescent lamp (CCFL) method.
2210_s15_qp_11
THEORY
2015
Paper 1, Variant 1
View
Jamelia has a greenhouse that she uses to grow fruit and vegetables. She needs to make sure the temperature in the greenhouse stays between 25 °C and 30 °C . A system that has a temperature sensor and a microprocessor is used to maintain the temperature in the greenhouse. The system will: • open a window and turn a heater off if it gets too hot • close a window and turn a heater on if it gets too cold. Describe how the system uses the temperature sensor and the microprocessor to maintain the temperature in the greenhouse.
2210_s21_qp_11
THEORY
2021
Paper 1, Variant 1
View
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. Identify two other input devices that could be built into the ticket machine. Input device 1 Input device 2 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. The touch screen for the ticket machine uses resistive technology. Describe how resistive touch screen technology operates to recognise a user’s touch. Give two benefits of using resistive touch screen technology for the ticket machine. Benefit 1 Benefit 2 Give two drawbacks of using resistive touch screen technology for the ticket machine. Drawback 1 Drawback 2 Identify one other touch screen technology that could have been used. The computer in the ticket machine uses the stored program concept. Describe the stored program concept. The computer in the ticket machine has an operating system. One function of the operating system is to provide an interface for the user. State three other functions of the operating system. Function 1 Function 2 Function 3 The computer uses 12-bit binary registers to store data whilst it is being processed. Customers are given a denary ticket number. Give the 12-bit binary value that is stored in the register for each denary ticket number. Working space Show the denary ticket number that would be given to the customer for each 12-bit binary value. Working space Binary values can also be represented as hexadecimal values. Show the hexadecimal value that represents each of the two 12-bit binary values. Working space
2210_w22_qp_12
THEORY
2022
Paper 1, Variant 2
View
A keyboard is a type of input device that can be used to enter data into a computer. Complete the paragraph that describes one method of operation for a keyboard, using the most appropriate terms from the given list. Not all terms in the list need to be used. • Binary • Breaks • Calculated • Character • Circuit • Current • Information • Network • Press • Processor • Signal • Switch A keyboard has a key matrix underneath the keys. When a key is pressed, it presses a that completes a . This allows to flow. The location of the key pressed is . The location of the key pressed is compared to a map to find the value for the key that has been pressed.
2210_s21_qp_12
THEORY
2021
Paper 1, Variant 2
View
Questions Discovered
31