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?
The Development of American Literature
Within the years that adopted, American businessmen merged the processes and created profitable publishing homes which created a necessity for the event of American literature. Within the early 18005, restricted sources equivalent to monetary stability and viable transportation made publishing in the USA a lower than worthwhile enterprise. The rand 18005, nonetheless, generated expertise that […]
