21.4 PRACTICE PROBLEMS

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3.

a) Represent the following decimal value thumbwheel input as a Binary Coded Decimal (BCD) and a Hexadecimal Value (without using a calculator).

3532

i) BCD

ii) Hexadecimal

b) What is the corresponding decimal value of the following BCD

1001111010011011

(ans. a. 3532 = 0011 0101 0011 0010 = DCC, b. the number is not a valid BCD)

5. TRUE or FALSE -- A Word is 3 nibbles.

(ans. false)

20. Convert the following from binary to decimal, hexadecimal, BCD and octal.

21. Convert the following from decimal to binary, hexadecimal, BCD and octal.

22. Convert the following from hexadecimal to binary, decimal, BCD and octal.

23. Convert the following from BCD to binary, decimal, hexadecimal and octal.

24. Convert the following from octal to binary, decimal, hexadecimal and BCD.

25. Why are binary, octal and hexadecimal used for computer applications?

26. Add/subtract/multiply/divide the following numbers.

27. Short answer

b) What are the specific purpose for Gray code and parity?

.