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Posted: February 24th, 2022

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. Homework help – 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. Homework help – 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?

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