\u00a0\u00a0
\n1. Which microprocessor pins are used to request and acknowledge a DMA transfer?
\n2. A DMA read transfers data from _________ to \u00a0_________.
\n3. The DMA controller selects the memory location used for a DMA transfer through what bus signals?
\n4. What is a memory-to-memory DMA transfer?
\n5. Describe the effect on the microprocessor and DMA controller when the HOLD and HLDA pins are at their logic 0 levels.
\n6. If the 8237 DMA controller is decoded at I\/O ports 2000H -200FH, what ports are used to program channel 1?
\n7. How many bytes can be transferred by the 8237 DMA controller?
\n8. 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.
\n9. The 3 \u00bd\u201d disk is known as a(n) __________ floppy disk.
\n10. A track is divided into sections of data called __________.
\n11. Why is NRZ recording used on a disk memory system?
\n12. Draw the timing diagram generated to write a 1001010000 using RLL encoding
\n13. Why must the heads on a hard disk be parked?
\n14. What is a WORM?
\n15. How much data can be stored on a common DVD, an HD-DVD, and a Blu-ray DVD?
\n16. What are the three primary colors of light?
\n17. What is a pixel?
\n18. What 8086\/8088 signal is used to select the direction of the data flows through the 74LS245 bidirectional bus buffer?
\n19. How much time is allowed for memory access when the 8086\/8088 is operated with a 5MHz clock?
\n20. What are the five major keywords in VHDL for the five major logic functions (AND, OR, NAND, NOR, and invert)?
\n21. Write the software required to place a logic 1 on the PC7 pin of the 82C55during strobed input operation.\u00a0
\n22. How many ICWs are needed to program the 8259A when operated as a single master in a system?
\n23. Explain how a TTL RGB monitor can display 16 different colors.
\n24. Explain how an analog RGB monitor can display an infinite number of colors.
\n25. 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?<\/p>\n","protected":false},"excerpt":{"rendered":"
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