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Procedure
4—
Over
punch
an
Error
Field
(Use
this
procedure
if
cards
were
punched on
a
non-SC
machine,
and
require validation
or
error identification
of
the
SC
field
in
the verify operation.)
1.
Hold
down
VER
SC,
and
2.
Press
12 (&)
or
1 1
(-) key;
release
VER
SC.
3.
Continue normal
operation.
The machine
is
set
for
a
verify-correction
punchout
at
the
end of
this
card.
Appropriate escape procedures can
override the correction
punchout.
Column
81
Status,
Procedure
4:
1
Error Card:
No
punching
occurs.
2.
Correction Card: Verify-correction
identifier
2-punch
occurs.
The
11
-punch
is
prevented
regardless
of
the
status
of
other
self-check
fields.
Notes:
1
If
procedure
A
were used
in
punching, procedure
1
would be
the
similar
procedure during
verify.
However,
procedure 3 could
also
be
used.
2. If
procedure
B
were used
in
punching, procedure 2
would
be
the
similar
procedure during
verify.
However,
procedure
1
or
3 could
also
be
used.
Note
that
if
a
self-check error
field
were overpunched with
a 12-
or
an
1
1-punch
during
procedure
B
in
punching, procedure
4
in verify
could
also
be
used.
If
during procedure
4
the
operator
made
the
"opposite"
overpunch from
that
made
in
punch
procedure
B
(1
2-punch
in
place
of
1
1-punch, or
vice-versa),
then
the correction card
would
contain
both
the
12-
and
11-overpunch. Since
proce-
dure
4
only adds the overpunch,
it
does not change
existing
punches
in
the
units position
of
the
SC
field.
3.
If
the cards
were
punched on
a
non-self-check
machine,
procedure
1
,
3,
or
4
could be
used.
4.
During
verify
operation,
in self-check
fields,
the units
position
overpunch of an
11
or a 12
is
automatically
removed whenever any
position in
that
field
has
been
replaced
by any form
of
verify-correction
procedures.
5.
To
insert
a
correct self-check
number
in
a previously
skipped
blank
field
in
the
original
punched
card,
perform
a
data read operation
with
the
original card.
Then,
in
punch mode,
manually
skip to
the
blank
field,
and
key
the self-check
number, and manually
skip (or
release)
the balance
of
the input
storage.
(Be
sure
REC
ADV/CARD FEED
is
set
to
MANUAL.)
Then
insert
and
register
the
original
punched
card,
and
set
REC ADV/
CARD
FEED
to
AUTO,
or
make
a
manual program
selection.
The
original
card has
only
the self-check
field
punched,
since
all
other
columns were keyed
as spaces,
because
the
original
punches
should not
be
over-
punched.
If
the
SC
identifier
1
1-punch
is
desired
in
column
81,
key
the record using
a
program
card
coded
for
SC
in
the desired
field.
If
the
verify-OK
identifier 2-
and
3-punches
are also
desired, verify
the card using
normal
procedures;
if
the
verify
is
done
using a self-check
programmed
field,
the
SC
identifier
1
1-punch
also
punches
in
column
81
6.
If
procedure
B
were used
in
punching (overpunch
a
1
or
an
11),
the
field
could
be
auto-skipped
and
not
verified
and
not
self-checked,
and
a
correction
could be
made
at
a
later
time
;
or, if
the
verify
operator
had
the
responsibility for
correction
of
the incorrect
self-check
numbers,
she
could
use procedure
3.
7.
The
choice
of
the procedures
in
both punching and
verifying
is
left
to the
discretion
of
the
user, selecting
that
one which
best
serves
his
present or
planned
operating procedures.
Figure 15
summarizes
self-check verifying
operations
in
skip
or
dup
fields,
and
for release
operations before or
after
a self-check
field.
Self-checking
Number
Feature (Technical Description)
This
special
feature
is
available in
two
forms.
The
first,
modulus
10,
is
primarily
designed to
detect the
most
common
type of errors-the
incorrect
keying of
a
single
digit,
and
a
single
transposition.
The
second,
modulus
1
1
,
is
designed to detect
single digit
mispunches,
single transposi-
tions,
and
double
transpositions.
No
special
knowledge
is
required
by
code
clerks
who
record these
numbers on
the
original
document,
or
by
operators
who
punch
the data
into cards. In keying, the
operator
keys
in
the
field,
through
the
check-digit (lowest-
order) position,
as
it
appears
on
the source
document.
Internal calculations
(in
the
machine)
verify
the accuracy of
the
keying or
the
validity
of
the self-check
digit.
When
the
data
on
the source
document
is
correct,
and
the data has
been
keyed
correctly,
the
punching
operation
is
not
interrupted.
Procedures
for
this
keying operation
are
found
starting
under
"Punch
Procedure"
in this section.
The
coding of
the
self-check
digit
on
the source docu-
ment
is
generally
considered
a
procedure
separate
from
the
keying of
the data
onto
punched
cards.
In the following
coding procedures, note
that
the
basic
code
number
is
the
data before coding.
The
coding process adds
one column
digit
(lowest-order),
so
that the resultant self-checking
number
is
an
entire
field,
containing
one
digit
more
than
the
original
basic
code number.
Modulus 10
1.
The
units position
and
every
alternate
position
of the
basic
code
number
are
multiplied
by
2.
2.
The
digits in
the
product
and
the
digits
in
the
basic
code
number
that
are
not
multiplied
by 2
are
crossfooted.
3.
The
crossfooted
total
is
subtracted
from
the next higher
number
ending
in zero.
4.
The
difference
is
the
check
digit.
Special
Features
55
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