18 Questions
What is the main role of the CPU in a computer system?
The CPU performs arithmetic and logic operations and controls the operation of the entire system.
Why are peripheral devices necessary in a computer system?
Peripheral devices permit communication of information and storage of information.
Why is it inappropriate to connect peripherals directly to the CPU?
Modern computers perform operations much faster than most peripherals can generate or accept data.
What is the purpose of a Peripheral Adapter in a computer system?
A Peripheral Adapter works as an interface between the CPU (very fast) and a peripheral device (relatively slow) for data communication.
How do peripheral devices communicate with the CPU?
Peripherals normally communicate through the CPU, although some may communicate directly with memory, bypassing the CPU.
Why does the number and types of peripheral devices depend on the main applications for which the computer system is intended?
The number and types of peripheral devices depend on the main applications for which the computer system is intended because different applications may require different input/output devices.
What is the purpose of the Control Register in a Peripheral Adapter?
Stores values to control the operation of the adaptor.
Why is the Status Register important for the CPU?
To determine the status of the device.
What is the purpose of a Data Register in a Peripheral Adapter?
Used to hold temporarily a value to be transferred to or from the peripheral.
How does an adapter recognize a peripheral device?
By comparing the address on the address bus with the peripheral adapter's address.
What is typically the function of the control logic when the address on the bus matches the adapter's address?
To perform the required function, like reading from or writing to a register.
What are the individual pieces of information stored in the control and status registers known as?
Flags.
What is the purpose of the Data Bus in a computer system?
It contains the information or program instructions required by the CPU.
How does the number of lines in the Address Bus affect the amount of physical memory that can be addressed?
If there are n lines, then 2^n locations can be addressed.
What is the function of the Control Bus in a computer system?
It contains control signals required to maintain orderly flow of data along the bus.
What type of data bus is typically used in small systems and why?
Small systems use 8-bit data bus because they are of low cost.
How does increasing the number of data lines in a data bus improve the speed of operation?
Adding more data lines allows for the transfer of more data at a time, thus improving the speed of operation.
What components are found in a Peripheral Adaptor (PA) connected to the data highways?
Control register, Status register, Data register, Control Logic, Address Comparator.
Explore the role of computer peripherals and the central processing unit (CPU) in the operation of a computer system. Learn how CPU performs arithmetic and logic operations, controls the system, and communicates with peripheral devices.
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