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Assignment 7-Cont. - 14100_442
Assignment 7-Cont. - 14100_444

Fire Controlman Volume 03-Digital Data Systems
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7-41. Input and output chains deal primarily with which of the following activities? 1. The processing of IOC control words 2. Specification of the locations of external status words 3. Transfer of blocks of information 4. Addresses provided by the load control memory command 7-42. Data transfer between the computer and external equipments will take place when which of the following conditions is/are met? 1. The memory areas for the data have been specified by the computer programs 2. The external equipment is ready to send or receive data and has sent a request signal 3. Initiate input/output or equivalent instruction is executed by the CPU 4. All of the above 7-43. Which of the following is one of the constants in all I/O operations? 1. Data words will always be limited to 16 bits 2. When the data transfer will begin 3. The circuitry required to connect external equipments 4. A serial data interface between the computer and  external  equipments 7-44. In I/O operations, communications with the external equipment require which of the following devices/operating  modes? 1.  An  IOC 2. A single channel operating mode 3. Circuitry that specifies a sequence of events 4. A dual channel operating mode 7-45. When an index address in main memory is specified by an external equipment during an I/O operation, the computer is operating in which of the following modes? 1.  Intercomputer  channel  mode 2.  Externally  specified  index  mode 3. Externally specified address mode 4. Dual channel mode 7-46. In I/O operations, which of the following is one of the primary uses of registers? 1. To enable and route data information only 2. To enable and route control information only 3. To enable and route both control and data information 4. To provide timing circuitry for I/O interfacing 7-47. Decoder circuits are used for which of the following purposes? 1. Main timing 2. I/O processors 3.  Address  translation 4. Data buffers 7-48. Status registers are used for which of the following purposes? 1. To enable and route data using the internal bus system 2. To hold or buffer data during interchanges between the very fast CPU and slower external   equipments 3. To hold control data generated by main memory or the CPU when operating with very fast  external  equipments 4. 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 47






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