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Review

1. Why does a computer need an expansion bus?
2. Name the available expansion buses.
3. What happens if two non-PCI devices use the same I/O address?
4. How many IRQs are available on most PCs?
5. Under what conditions would a second modem-installed and assigned to COM3-not work?
6. Identify the two divisions of the external data bus and describe the purpose of each.
7. What is the standard that governs computer buses?
8. What is the difference between ISA and EISA cards?
9. Why was VESA created?
10. What is bus mastering?
11. Describe ways in which the PCI bus is better than previous technologies.
12. How does the CPU use I/O addresses?
13. What is the I/O port address of COM2?
14. What are the functions of IRQs?
15. List as many of the standard IRQ assignments as you can.
16. What is the function of the DMA chip?
17. Why is it important not to assign an IRQ to more than one device?
18. What is the difference between COM ports and LPT ports?
19. Why is it important to document IRQs, DMAs, and I/O addresses?

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