Chapter Resources: Chapter Assignments
Chapter 10 - Arithmetic Circuits

1. Do some binary addition and subtraction problems using a scientific calculator. (see www.calculator.com for a variety of calculators)
   
2. Signed binary numbers are written in what form?
   
3. An 8-bit group can represent signed numbers from + _____ to - _____ when written in 2s complement notation.
   
4. Write the 2s complement notation for the following numbers:
   1. +127
   2. -128
   3. -90
   4. -40
   5. +40
   6. +90
      
5. Binary adder and subtractor circuits are classified _____ (combinational, sequential) logic circuits. This type of logic circuit _____ (has, does not have) a memory characteristic.
   
6. Can you find a scientific calculator that will do calculations on hex numbers? (see www.calculator.com for a variety of calculators)
   
7. Refer to the adder/subtractor system shown in Fig. 10-30, Digital Electronics, 6th.ed. p. 327. During addition the Cin input to the 1s FA block is LOW which converts the full adder into a _____ adder circuit.
   
8. Refer to the adder/subtractor system shown in Fig. 10-30, Digital Electronics, 6th.ed. p. 327. What is the purpose of the XOR gates during the subtraction process?
   
9. Refer to Fig. 10-1 (below). Using circuit simulation software,
   1. construct the 4-bit adder/subtractor system,
   2. try several addition and subtraction problems, and
   3. demonstrate the circuits operation to your instructor.