7-48. Status registers are used for which of the following purposes? 1. 2. 3. 4. To enable and route data using the internal bus system To hold or buffer data during interchanges between the very fast CPU and slower external equipments To hold control data generated by main memory or the CPU when operating with very fast external equipments To hold information for the CPU that indicates the operating condition and current activities of the external equipments 7-49. In computers with an IOC, once started the master clock can be stopped when which of the following actions occurs? 1.  Computer  master  clear 2.  External  interrupt 3.   Input   data   request 4. Output data request 7-50. In computers with an IOC, the master clock is started when which of the following actions occurs? 1.  The  computer  is  initially  powered  on 2.  The  computer  is  auto  restarted 3.  Both  1  and  2  above 4.  An  execute  master  clear  is  issued 7-51. The I/O control circuits are controlled by which of the following means? 1.  The  CPU 2.  The  IOC 3.  The  I/O  master  clock 4.   The   computer   program 7-52. A sequential set of memory locations that contains data to be sent out or an area that is set aside for data to be received is called which of the following? 1.   An   input   register 2.   An   output   register 3.  Both  1  and  2  above 4.  A  buffer 7-53. Which of the following are unbuffered operations? 1.  Data  transferred  between  computer and  external  devices 2.  Where  data  is  exchanged  between  the 3.  CPU  and  various  parts  of  the computer Both  1  and  2  above 4.  Data  exchanged  between  external devices   offline 7-54. The  I/O  processor’s  sequencing  circuits control which of the following actions? 1 . The order in which events will be executed based upon the translated function   code 2. The order in which memory addresses of data to be retrieved or stored will be acted on 3. The order in which external equipment output requests will be acknowledged 4. The order in which external interrupts will be acted on by the computer 7-55. The CPU interfaces with the I/O processor through which of the following means? 1.  Special  interface  circuits 2.  The  CPU’s  I/O  instructions 3.   The   sequencing   circuitry 4.   The   maintenance   console 58