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21. 

COM 4 uses which I/O port?
A. 2F8H
B. 3F8H
C. 3E8H
D. 2E8H
E. None of the above
22. 

What type of FRU is a SCSI host adapter?
A. CPU
B. I/O card
C. video card
D. hard drive
E. None of the above
23. 

How many DMA channels are in an AT-machine?
A. 3
B. 4
C. 7
D. 8
E. None of the above
24. 

Which provides the fastest data access time?
A. RAM
B. ROM
C. CD-ROM
D. Hard disk
E. None of the above
25. 

Which is NOT typically a Field Replaceable Unit?
A. System ROM
B. Power supply
C. System chasis
D. Video controller
E. None of the above