7-61. The CPU handles all I/O transactions by executing
one or more instructions for each word of
information transferred. This process is known by
which of the following terms?
1. Polled I/O
2. Memory mapped I/O
3. Interrupt driven I/O
4. Accumulator based I/O
7-62. In memory mapped I/O, the CPU accesses the I/O
device by which of the following means?
1. Tieing peripheral devices directly into the
communication bus
2. Placing appropriate addressing information on
the bus
3. Checking each channel or port to determine if
it has data for input or is ready to accept
output data
4. Using an I/O processor for interface between
memory and the external equipments
7-63. During direct CPU interface operations, the CPU
continuously tests the status register. This
technique is known by which of the following
terms?
1. Memory mapped I/O
2. Accumulator based I/O
3. Interrupt driven I/O
4. Polled I/O
7-64. The main advantage of direct memory access is
which of the following?
1. Speed
2. Reliability
3. Less complicated circuity
4. Maximum utilization of memory
7-65. When the CPU and the DMA attempt to access
main memory simultaneously, the CPU has
priority.
1. True
2. False
7-66. When a high speed disk drive is used, output data
will be in which of the following forms?
1. Octal
2. Binary
3. Octal coded decimal
4. Various; form is dependent on type of
interface used
7-67. The technique used when more than one
peripheral device is connected to a single
port/channel is known by which of the following
terms?
1. Daisy chaining
2. Independent request control
3. External interrupt control method
4. Request/acknowledge control method
7-68. When more than one peripheral device is
connected to a single port/channel, the priority of a
device is determined by which of the following
factors?
1. The CPU
2. The I/O controller
3. The computer program
4. The order of connection
7-69. When using a request and acknowledge system,
the priority of the functions and channels is
determined by which of the following factors?
1. The CPU
2. The I/O controller
3. The computer program
4. The order of connection
7-70. Communication formats are governed by which of
the following items?
1. The type of external equipment
2. The speed of the external equipment
3. The interfacing standard
4. The speed of the computer
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