7-51. The I/O control circuits are controlled by which of
7-56. I/O control memory words are set aside in main
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 known by which of the
following items?
1. An input register
2. An output register
3. Both 1 and 2 above
4. A buffer
7-53. Which of the following operations is/are
unbuffered?
1.
2.
3.
4.
Data is transferred between the computer and
the external devices
Data is exchanged between the CPU and the
various parts of the computer
Both 1 and 2 above
Data is 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
memory to control which of the following actions?
1. Data transfers for I/O buffer functions
2. The sequence of I/O operations
3. Parallel operations
4. Serial operations
7-57. In parallel operations, each I/O channel has its
own block of memory addresses for which of the
following operations?
1. Input and output only
2. External function only
3. External interrupt operations only
4. Input, output, external function, and external
interrupt operations
7-58. Serial operations are affected by which of the
following factors?
1.
2.
3.
4.
Character size, parity selection, and
asynchronous interfacing only
Parity selection, baud rate, and synchronous
interfacing only
Character size, parity selection, and
synchronous and asynchronous interfacing
only
Character size, parity selection, baud rate, and
synchronous and asynchronous interfacing
7-59. Monitor words are used for which of the following
purposes?
1. To monitor external equipment status
2. To monitor bytes that are to be transferred by
the pending operation
3. To store characters for comparison with
received data characters
4. To monitor main memory for the next
available address for chaining instructions
7-60. Another term for accumulator based I/O is which
of the following?
1 Direct CPU interface
2. Direct memory access
3. Interrupt driven I/O
4. Memory mapped I/O
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