4-46. 4-47. 4-48. 4-49. The control section may provide the computer with the ability to function under which of the following conditions? 1.   Manual   control   only 2.   Program   control   only 3.  Manual  and  program  control 4.   Interface   control The control section includes all the following logically designed areas except which one? 1.  Timing,  and  instruction  and  control 2.  Fixed-  and  floating-point  operations 3.  Memories—control,  cache,  and  read- only 4.   Addressing   and   interrupts What logically designed area in the control section regulates the operation of the computer? 1.   Instruction   and   control 2.  Addressing 3.   Interrupts 4.  Timing What type of timing is used for the execution of instructions stored sequentially in memory? 1.   Arithmetic   timing 2.  Synchronous  operations 3.   Master   clock   events 4.  Asynchronous  operations IN ANSWERING QUESTIONS 4-50 THROUGH 4-55, SELECT FROM THE FOLLOWING LIST THE LOGICALLY DESIGNED AREA THAT PERFORMS THE OPERATION AS DESCRIBED IN EACH QUESTION. 1.   Master   clock 2.   Main   timing   chain 3.   Main   timing   signals 4.   Timing   sequences 4-50. 4-51. 4-52. 4-53. 4-54. 4-55. 4-56. 4-57. 4-58. Used to trigger a single-shot to enable and disable circuits in the sequence necessary to execute computer operations. Flip-flops are arranged in a ring counter to count master clock phases. Used to generate a command enable for sending data from one register to another. Taps on a delay line oscillator can be used to provide additional phases. Used to issue a series of commands to perform a particular instruction or operation. Used to start arithmetic timing and generate command enables used for arithmetic   operations. To keep track of time intervals, which of the following types of timing circuitry can be used? 1.   Monitor   clock   only 2.  Programmable  internal  timer  only 3.  Monitor  clock  and  programmable internal  timer 4.   Real-time   clock   (RTC) To keep track of real time, which of the following timing circuits can be used? 1.   RTC   only 2.   Monitor   clock   only 3.  RTC  and  monitor  clock 4.  RTC  and  programmable  interval  timer Which of the following timing circuits are software/machine instruction controlled? 1.  RTC  only 2.   Monitor   clock   only 3.  Programmable  interval  timer  only 4.  RTC,  monitor  clock,  and programmable  interval  timer 31