Microprocessors

  

1. Which microprocessor pins are used to request and acknowledge a DMA transfer?

2. A DMA read transfers data from _________ to  _________.

3. The DMA controller selects the memory location used for a DMA transfer through what bus signals?

4. What is a memory-to-memory DMA transfer?

5. Describe the effect on the microprocessor and DMA controller when the HOLD and HLDA pins are at their logic 0 levels.

6. If the 8237 DMA controller is decoded at I/O ports 2000H -200FH, what ports are used to program channel 1?

7. How many bytes can be transferred by the 8237 DMA controller?

8. Write a sequence of instructions that transfers data from memory to an external I/O device by using channel 3 of the 8237. The memory area to be transferred is at location 20000H -20FFFH.

9. The 3 ½” disk is known as a(n) __________ floppy disk.

10. A track is divided into sections of data called __________.

11. Why is NRZ recording used on a disk memory system?

12. Draw the timing diagram generated to write a 1001010000 using RLL encoding

13. Why must the heads on a hard disk be parked?

14. What is a WORM?

15. How much data can be stored on a common DVD, an HD-DVD, and a Blu-ray DVD?

16. What are the three primary colors of light?

17. What is a pixel?

18. What 8086/8088 signal is used to select the direction of the data flows through the 74LS245 bidirectional bus buffer?

19. How much time is allowed for memory access when the 8086/8088 is operated with a 5MHz clock?

20. What are the five major keywords in VHDL for the five major logic functions (AND, OR, NAND, NOR, and invert)?

21. Write the software required to place a logic 1 on the PC7 pin of the 82C55during strobed input operation. 

22. How many ICWs are needed to program the 8259A when operated as a single master in a system?

23. Explain how a TTL RGB monitor can display 16 different colors.

24. Explain how an analog RGB monitor can display an infinite number of colors.

25. If a video system uses a vertical frequency of 60 Hz and a horizontal frequency of 32,400 Hz, how many raster lines are generated?