8-54.
When the computer samples an interrupt
code, which of the following signals will
occur?
1. An external interrupt acknowledge
2. An external interrupt enable
3. An input data acknowledge
4. All of the above
8-55.
In a two cable sequence of events for input
data, the first event will be which of the
following?
1. The external equipment sets the IDR
l i n e
2. The external equipment places a word
of data on the ID lines
3. The computer sets the input data
request line
4. The computer clears the IDA line
8-56.
In the two cable sequence of events for
input data, the computer has sampled the
data on the ID lines. Which of the
following events must occur before the
computer will accept more data?
1. The IDR must be cleared
2. A new data word must be placed on
the I/O lines
3. The IDR must be reset
4. All of the above
8-57.
During a normal external function
sequence of events, the computer places an
EF code word on the OD lines. The next
event to take place is which of the
following?
1. The EFR line is set
2. The ODA line is set
3. The EFR line is cleared
4. The EFA line is set
68
8-58.
During forced external functions, the
computer does not require which of the
following signals?
1. An EFR
2. An EFA
3. An ODR
4. An ODA
8-59.
During the external interrupt sequence of
events, what is the first event that must
occur before a computer will accept an
external interrupt?
1. The EI code word is placed on the ID
lines
2. The EIE line is set
3. The EIR line is set
4. The IDA line is set
8-60.
During the external interrupt sequence of
events, the computer samples the EI code
word on the ID lines and clears the EIE line
for data to continue to transfer. Which of
the following events, must occur?
1. The computer sets the IDA line only
2. The external equipment detects the
setting of IDA line only
3. The computer clears the IDA line only
4. The computer sets the IDA line, the
external equipment detects the setting
of the IDA line, and the computer
clears the IDA line
8-61.
All computers used by the Navy will have
EIE lines.
1 . T r ue
2. False
