6-43.
Compared with semiconductor memories,
magnetic memories have which of the
following advantages?
1. They cost less
2. They are faster in terms of storage and
a c c e ss
3. They require less power and they are
volatile
4. They require less power and they are
nonvolatile
6-44.
The state of a core or film is changed by
which of the following conditions?
1. Current flow in the opposite direction
of sufficient magnitude to overcome
the magnetic field and to magnetize in
the new direction
2. Current flow in the same direction of
sufficient magnitude to match the
magnetic field and to magnetize in the
old direction
3. Voltage amplitude of a sufficient
magnitude to overcome the magnetic
field and to magnetize in the new
direction
4. Current flow in the opposite direction
of sufficient magnitude to overcome
the magnetic field and to magnetize in
the old direction
6-45.
Compared with core memory, film memory
has which of the following advantages?
1. Increased speed of read/write
operations and less power required
2. More compact and durable
3. Twice as many memory cells can be
put in the same space for the same
amount of power
4. Each of the above
6-46.
Each ferrite core can store what total
number of bits?
1 . O ne
2.
Two
3. Three
4.
Four
6-47.
In a four-wire core winding, what is the
physical make up of the windings that are
strung through each and every core?
1. 1 drive line, 1 sense line, and 1 inhibit
l i n e
2. 2 drive lines, 1 sense line, and 2
inhibit lines
3. 2 drives lines, 1 sense line, and 1
inhibit line
4. 2 drive lines, 2 sense lines, and 1
inhibit line
IN ANSWERING QUESTIONS 6-48 THROUGH
6-51, SELECT THE CORE LINE THAT
MATCHES THE DESCRIPTION IN EACH
QUESTION.
6-48.
6-49.
6-50.
6-51.
1.
Drive line
2.
Sense line
3.
Inhibit line
Detects the change in state of the core from
one to zero.
Each line provides 1/2 of the current
necessary to change the state of the core.
Prevents changing the core from a zero to a
one.
In a three-wire core, this line performs the
same function as in the four-wire core.
47
