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8
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
Figure 5. Use o f Class Selector for O f f s e t Gang Punching
1. A 3 i n column 80 is sensed for punch suppression con-
trol and class selector pickup, using a digit selector.
2. Punching is suppressed as the 3-punched card passes
the die and stripper.
3. The class selector I transfers while the 3-punched card
passes the second set o f brushes.
4.
The No X card following the 3-punched card is punched
in card columns 56
-
60 from columns 21 - 2 5 .
5. All No X cards gang punch in columns 56
-
60.
distributor.
Then only the desired digit in any
card column can be recognized by proper wiring
of the 9-12 hubs of the distributor. Figure
5
shows
the distributor used as a digit selector.
Sign Control (Optional)
Sign control permits determination of the sign
(plus or minus) of a product by analysis of the
sign of its factors. Two factors having the same
sign produce a positive product, but if one factor
is positive and the other negative, the product will
be negative.
For multiplication, factors should always be
punched as true figures whether their sign is plus
or minus. In an IBM card the minus sign may be
indicated by an X punch.
Any column may be
used for the X punch, indicating the sign of a fac-
tor, but preferably it should be the unit column of
the factor field.
Wiring for sign control is shown in Figure 6. T o
place the sign control feature in operation, the
SIGN
CTRL
control panel switch must be wired
ON.
There are two sign control pickups on the control
panel, labelled
MCX
(multiplicand X) and
MPX
(multiplier X ) . One of the two common hubs,
MCX
should be wired from the column in Read for
Entry and Control containing the minus X for
,the multiplicand.
One of the two common hubs
MPX
should then be wired similarly for the multi-
plier minus
X.
If only one of the sign control pickups reads an
X, the product should be negative. The machine
will punch the product in true figures, and to
designate the product as negative, will punch an
X in the units column of the product field. T o
punch the minus
X
in the units column, the units
position of the product field must be wired from
the
PRX PCH
hub to the Punch Entry hub (Fig-
ure 6 ) . The wiring is taken through the column
split to permit
X
punching over the units digit. If
it is desired, the negative product X may be
punched in any column of the card.
Sign Control Checking
When sign control is used in the original calcu-
lation, with a negative product indicated by an X
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