The general role of an operating system is to: 选择一个答案 a. Provide a set of services to system users b. Manage files for application programs c. Act as an interface between various computers d. None of the above Information that must be saved prior to the processor transferring control to the interrupt handler routine includes: 选择一个答案 a. Processor Status Word (PSW) & Contents of processor registers b. None of the above c. Processor Status Word (PSW) d. Processor Status Word (PSW) & Location of next instruction a. Service them in round-robin fashion b. Disable all interrupts except those of highest priority c. None of the above d. Define priorities for the interrupts In a uniprocessor system, multiprogramming increases processor efficiency by: 选择一个答案 a. Increasing processor speed b. Eliminating all idle processor cycles 

c. All of the above d. Taking advantage of time wasted by long wait interrupt handling As one proceeds down the memory hierarchy (i.e., from inboard memory to offline storage), the following condition(s) apply: 选择一个答案 a. Decreasing capacity b. Increasing cost per bit c. Increasing access time d. All of the above Small, fast memory located between the processor and main memory is called 选择一个答案 a. Cache memory b. CD-RW memory c. WORM memory d. None of the above When a new block of data is written into cache memory, the following determines which cache location the block will occupy: 选择一个答案 a. Cache size b. None of the above c. Write policy d. Block size The four main structural elements of a computer system are: 

选择一个答案 a. Processor, Registers, Main Memory & System Bus b. None of the above c. Processor, Registers, I/O Modules & Main Memory d. Processor, Main Memory, I/O Modules & System Bus The two basic types of processor registers are: 选择一个答案 a. None of the above Address registers may contain 选择一个答案 b. User-visible and user-invisible registers c. Control and Status registers d. User-visible and Control/Status registers a. Memory addresses of instructions b. Partial memory addresses c. Memory addresses of data d. All of the above A Control/Status register that contains the address of the next instruction to be fetched is called the: 选择一个答案 a. Program Counter (PC) b. Program Status Word (PSW) 

c. Instruction Register (IR) d. All of the above The two basic steps used by the processor in instruction processing are: 选择一个答案 a. Fetch and Instruction cycles b. Instruction and Execute cycles c. Fetch and Execute cycles d. None of the above A fetched instruction is normally loaded into the: 选择一个答案 A common class of interrupts is 选择一个答案 a. Instruction Register (IR) b. Accumulator (AC) c. None of the above d. Program Counter (PC) a. I/O b. Timer c. All of the above d. Program When an external device becomes ready to be serviced by the processor, the device sends this type of signal to the processor: 选择一个答案 

a. Halt signal b. None of the above c. Handler signal d. Interrupt signal 四川大学·国家示范性软件学院