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21) What decimal value does the 8-bit binary number 00010001 have if?

(a) It is interpreted as an unsigned number?

(b) It is on a computer using signed-magnitude representation?

(c) It is on a computer using one’s complement representation?

(d) It is on a computer using two’s complement representation?

32) Add the fallowing unsigned binary numbers as shown.

(a) 01110101+00010001  (b) 00010101+00011011  (c) 01101111+00111011

34) subtract the fallowing signed binary numbers as shown using two’s complement arithmetic.

a) 11000100-00111011 b) 01011011-00011111 c) 10101100-00100100

13) In the von Neumann model, explain the purpose of the:

a) Processing unit

b) Program counter

19) explain what it means to ‘fetch’ an instruction (How does it know where in memory to get the instruction from? Who received the fetched instruction and what does it have to do to make it executable?)

Look at Exercise 24 on page 191.Answer it and show the Truth Table for the one you selected. Which of the fallowing Boolean expressions is not logically equivalent to all the rest?

a) wx’ + xy’ + xz

b) w + x’ + y’ + z

c) w(x’ + y’ + z)

d) wx’yz’ + wx’y’ + xy’y’ + wz

Given the Truth Table for(xz) + y’[from Ex 13 page 190{xz+x’y’+y’z’=xz+y’}], state its Sum of Products expression then draw the Logic Circuit for that Sum of Products.

Answer Exercise 37 on page 192 For guidance, look at Exercise 36 and its solution on page 837.SHOW YOUR INTERMEDIATE COLUMNS that lead you to the final column solution. You should have a column for the output of each Logic Gate.

Answer Exercise 38 on page 193 SHOW YOUR INTERMEDIATE COLUMNS that lead you to the final column solution. You should have a column for the output of each Logic Gate.

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