DMA

What does DMA stand for?

• A. Direct Memory Access
• B. Direct Module Access
• C. Digital Memory Acceleration
• D. Direct Module Acceleration

What is the primary purpose of DMA?

• A. To increase processor speed
• B. To reduce memory access times
• C. To provide direct access to peripheral devices
• D. To increase memory capacity

Which device is responsible for controlling DMA transfers?

• A. Processor
• B. RAM
• C. Hard Drive
• D. DMA Controller

How does DMA improve system performance?

• A. By reducing the number of interrupts
• B. By increasing the speed of the processor
• C. By allowing devices to directly access memory
• D. By increasing the size of the memory

What is the difference between programmed I/O and DMA?

• A. Programmed I/O is faster than DMA
• B. Programmed I/O requires less memory than DMA
• C. Programmed I/O uses the processor to transfer data, while DMA uses a separate controller
• D. Programmed I/O can access any part of memory, while DMA can only access a specific area

Which types of devices benefit the most from using DMA?

• A. Devices that require high data throughput
• B. Devices that require frequent interrupts
• C. Devices that have low data transfer rates
• D. Devices that are not memory-mapped

How would you configure DMA to transfer data from a hard drive to memory?

• A. Set the DMA controller to read from the hard drive and write to memory
• B. Set the DMA controller to read from memory and write to the hard drive
• C. Configure the hard drive to directly access memory
• D. Configure the processor to transfer data between the hard drive and memory

Suppose you are designing a system that requires high-speed data transfer between a video card and memory. What advantages does using DMA offer over programmed I/O?

• A. DMA allows the video card to directly access memory, reducing the workload on the processor
• B. DMA allows for faster transfer speeds than programmed I/O
• C. DMA uses less memory than programmed I/O
• D. DMA allows for more efficient use of interrupts

In what situations might it be better to use programmed I/O instead of DMA?

• A. When the device is not capable of using DMA
• B. When the amount of data to be transferred is small
• C. When the processor is underutilized
• D. When the device is not time-critical