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62
T Y P E
6 0 3
E L E C T R O N I C M U L T I P L I E R
Multlpl~cond Counter
6
5
4
3
2
1
0
0
0
0
0
e
M u l l ~ p l l e r Counter
6
5
4
3
2
1
0
0
0
0
0
4
oddlng cycles
l o
I
1st Column S h ~ f t P o s ~ t ~ o n
of t6 pulses
No oddit~on 10 ~n 6 t h p o s ~ t ~ o n MIPller)
each
2nd Column S h ~ t t
No oddltlon 1 0 In 5th posltlon M ' P l ~ e r )
3rd Column S h ~ t t
No oddlt~on
(
0 In 4 t h posltlon MIPller)
4 t h Column S h ~ f t
No oddltlon ( 0 In 3rd p o s l t ~ o n M ' P l ~ e r )
5 t h
Column S h ~ f l
No oddlllon
(
0 In 2nd p o s ~ t ~ o n M ' P l ~ e r
1
6 t h Column Shltt
8 pulses added In Products Counter
4
ttmes
(
4 In Is1 porlllon MBPller)
Figure 60. Block Diagram
of
Multiplication b y Over-and-Over Addition
counter only during the last four of the ten add-
advanced
1
during each adding cycle. Since there
ing cycles, because the multiplier digit in the 5th
are ten adding cycles in each column shift, each
position is a
4,
etc.
position will advance through
O
and back to where
If half-entry is being used, a 5 is added into the
it started. When the counter position goes from
Proper Position of the Product counter during
the
9 to 0, a signal is provided to start adding the rnul-
first adding
the
last
tiplicand on the next adding
cycle
and to continue
Observe that except for half-entry, no adding takes
through the tenth adding cycle. Figure 61 shows
place in the products counter during the first add-
this operation for all six column shift cycles. There
ing cycle of each column shift.
One reason for
are no carry circuits in the multiplier counter;
having ten adding cycles in each column shift cycle
hence adding ten pulses to each position will return
is to permit half-entry during a cycle when no
other addition is taking place.
the counter to its original reading. The chief rea-
Figure 61 indicates how the machine determines
son for having ten adding cycles in each column
the number
of
times to add the multiplicand
shift instead of nine is to permit restoration of the
amount in the product counter during any given
counter to its original reading at the completion
column shift.
One position of the multiplier is
of a multiplication. This is necessary when group
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