IBM 80 User Manual

MULTIPLE COLUMN SELECTION DEVICE
63
Alphabetic sorting can be accelerated considerably
by the zero-elimination operation. Cards with long
names or descriptions can be segregated from cards
with short names or descriptions.
In the example below,
card 1 may
be sorted on all 12 colwnns, while card 2
requires sorting on only 5 columns.
Card Col. 1 2 3 4 5 6 7 8 9
10 11 12
Card 1
Card 2
CHRISTIANS 0 N
JONES
If columns 6 through 12 are wired for zero elimina-
tion, all cards with names as short or shorter than
JONES will be rejected on the first sort and need not
be sorted further until the regular sort on column 5 is
made. The operator's knowledge of the data punched in
the sorting
field will determine the best number of
columns to wire for
zero-eLimination on the first sort,
as well as whether or not smaller portions of the field
should be wired for elimination on successive sorts.
The wiring and switch settings are the same
as for
zero-elimination in numerical sorting.
Normal Sorting
With the zero-eliminate and the multiple column
selection switches turned off, all sorting selector
com-
mutator contact bars pushed out, and the single sort
brush replacing the multiple column brush,
sorting can
be accomplished in the normal manner.
INTERNAL CONTROLS
IN ADDITION to the external controls, several internal
mechanical and electrical components must
be added
to a standard Type 75,
80 or 82 Sorter to equip it with
a multiple column selection
device. A selection com-
mutator, several additional electrical timing commuta-
tors, and a set of mechanically operated transfer con-
tacts are mounted inside the covers 011 the right end of
each machine. Figure 47
shows the location of these
units on a Type 82 machine. These units are located
in a similar position on the Type
75 and 80 machines.
All units are driven
by gearing from a special card
feed crankshaft.
On a Type 82 machine, the standard electronk
chassis is replaced with a larger chassis to accommo-
date two type 2D21 thyratron tubes and the R-ZE
pluggable relay. A circuit cutout
duo relay, with several
additional
MCS resistors, is added on a panel on the
rear of the relay gate
as shown in Figure 48. Type
Figure 47. Internal Controls - MCS Device
82 machines equipped with the MCS device have larger
power supply rectifiers than
do the standard machines.
On Type 75 and 80 machines, slate base relays are
used in place of tubes to complete the MCS circuits.
Figure 48. Type 82 MCS Relay Gate, 115 volt AC

IBM 80 Specifications

General

Brand	IBM
Model	80
Category	Office Equipment
Language	English