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16. 

When was the IBM XT microcomputer released in the market?
A. 1970
B. 1971
C. 1987
D. 1986
E. None of the above
17. 

Which of the following is not used for storage purposes with main frame computers?
A. removable disks
B. fixed disks
C. mass storage systems
D. diskettes
E. None of the above
18. 

Which is true for the digital computer?
A. It is less accurate than the analog computer
B. It represents the decimal numbers through a string of binary digits
C. It is used primarily in scientific applications
D. Both (a) and (c)
E. None of the above
19. 

Which of the following terminals' output most closely resembles the output produced by a plotter?
A. graphics terminal
B. POS terminal
C. hardcopy terminal
D. all the above
E. None of the above
20. 

What is the main advantage of magnetic core memory over semiconductor RAM memory?
A. more compact and smaller
B. more economical
C. a bit does not have to write after reading
D. non volatile
E. None of the above