7-40.
The actual execution of chaining
instructions is independent of the CPU.
1.
True
2.
False
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
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