9-27. The a field is used to identify all except which of the following registers? 1.   Stack   pointer 2.   Accumulator 3.  Memory 4.  Index 9-28. Basic load, store, replace, and simple mathematical operations are performed using what instruction format? 1.       I 2. II 3.   IV-B 4. V 9-29. Format II instructions perform all except which of the following types of operations? 1.  Interrupt 2.  I/O  commands 3.   Single   precision   mathematics 4.  Program  sequence  control  jumps 9-30. What is the maximum value of a subfunction code of(a) two bits and (b) three bits? 1.   (a)   2   (b)   3 2.   (a)   2   (b)   7 3.   (a)   3   (b)   5 4.   (a)   3   (b)   7 9-31. Formats IV-A and IV-B are half-word instructions and two of them may be stored in one memory word. Which of the following methods is used to keep track of upper/lower instruction execution? 1.   Active   status   register 2.   Indirect   addressing   mode 3.   Monitor   clock 4.  Accumulator 9-32. For operations such as setting, clearing, or testing an individual bit, what instruction format is used? 1.   IV-B 2.   IV-C 3. III 4. II 9-33. For single- and double-precision floating- point math operations, what instruction format would be used? 1.      I 2 .    II 3 .    I II 4.     V 9-34. Which of the following are types of operand addressing? 1.  Direct  and  indirect  only 2.  Extended,  immediate,  and  implicit only 3.  Indexed  and  relative  only 4.  Direct,  indirect,  extended,  immediate, implicit, indexed, and relative 9-35. In which addressing mode is the operand itself contained in the instruction? 1.   Extended 2.   Immediate 3.   Implicit 4.   Relative 9-36. An instruction in which no operand address needs to be specified because the operation code contains all the information needed uses what addressing mode? 1.   Extended 2.   Immediate 3.   Implicit 4.   Indexed 74