Computer System Architecture

61. Two ways in which computer buses can communicate with memory in case of I/O devices by using:

1. Separate buses for memory and I/O device
2. Common bus for memory and I/O device
3. both a & b
4. none of these

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62. There are 2 ways in which addressing can be done in memory and I/O device:

1. Isolated I/O
2. Memory-mapped I/O
3. Both a & b
4. None of these

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63. Advantages of isolated I/O are:

1. Commonly usable
2. Small number of I/O instructions
3. Both a & b
4. None of these

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64. In ____________ addressing technique separate address space is used for both memory and I/O device:

1. Memory-mapped I/O
2. Isolated I/O
3. Both a & b
4. None of these

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65. ____________ is a single address space for storing both memory and I/O devices:

1. Memory-mapped I/O
2. Isolated I/O
3. Separate I/O
4. Optimum I/O

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66. Following are the disadvantages of memory-mapped I/O are:

1. Valuable memory address space used up
2. I/O module register treated as memory addresses
3. Same machine intersection used to access both memory and I/O device
4. All of these

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67. Who determine the address of I/O interface:

1. Register select
2. Chip select
3. Both a & b
4. None of these

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68. 2 control lines in I/O interface is:

1. RD, WR
2. RD,DATA
3. WR, DATA
4. RD, MEMORY

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69. In I/O interface RS1 and RS0 are used for selecting:

1. Memory
2. Register
3. CPU
4. Buffer

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70. If CPU and I/O interface share a common bus than transfer of data b/w 2 units is said to be:

1. Synchronous
2. Asynchronous
3. Clock dependent
4. Decoder independent

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