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If
the self-checking
digit
is
recorded
incorrectly
on
the
source
document,
the
keying
of
the
self-check
field
always
results in
an
error
condition indicated
in
the
units position
of
the
field.
Since the operator
cannot
make
the necessary
correction
in this case, a
means must
be provided
to allow
her
to
proceed
over
this
field
of
the card.
When
the
operator encounters
the
condition
of an
incorrectly
re-
corded
self-checking
digit
on
the source
document,
the
procedure
is
either
of
the following:
Procedure
A: With
the error
condition encountered
in
the
units position
of
the self-checking
number,
the operator
must
press
FIELD/WORD
BKSP.
This
unlocks
the key-
board, turns off the
error
light,
and
returns the
column
indicator
to
the
first
column
of
the
self-check
field.
At
this
point, pressing
SKIP
advances
the
column
indicator
through
the
self-check
field
and
into
the
first
column
of
the
next manually
keyed
field.
Under
these conditions, the
punched
card contains
no
information
punched
in
the
field
that
had
the self-checking
digit
recorded
incorrectly
on
the
source
document.
This card
does not contain an
11
-punch
in
column
8
1
.
No
1
1
-punch
signifies
that there
is
an
invalid
self-check
condition within the card
(either
an
error,
or
no
self-check
number),
unless
this
card
contains
another
self-check
field
that
was keyed
correctly.
Under
this
condition,
once
the
error
is
corrected
on
the
source
document,
only
the self-checking
number
field
has
to
be rekeyed
for the card.
Once
the
SKIP key
is
used
to
skip a
complete
self-check
field
(denoting
a
single
self-check
error),
the only
way
the error condition
can be superseded
is
by
keying
a
later
SC
field
correctly,
or
by
pressing
REC
BKSP.
This
returns
the
column
indicator to the
first
manually keyed
column
of
the
card,
allowing
complete
rekeying of
the
card.
If
the self-check
field
is
keyed
correctly,
the
1
1
-punch
is
entered
in
column
8
1
Procedure B:
With
the error
condition encountered
in
the
units position
of
the self-checking
number,
the operator
must
hold
down
VER
SC
while
keying
the
1
2 (&)
or the
11
(—
)
key,
which
causes
the
units
position
of
the
self-check
number
to
be
overpunched with
either
a
12-
or
11 -punch,
respectively.
This
procedure
resets
the
self-check
light
and
allows the operator
to
continue keying the next
manual
position
of
the record.
Note
that
the
11
-punch
in
column
81
is
not
entered
after
this
type
of
self-check
bypass has
occurred,
regardless
of
the other correct
SC
fields.
Record
backspace
and
rekeying
of
the
record
without
use
of procedure
B
is
necessary
if
a valid
1
1-punch
in
column
8
1 is
desired.
Self-check
Characteristics
The
self-checking
number
can
include alphabetic
letters,
numeric
digits,
and
spaces,
but only
the
numbers
0-9
and
the
digit
portion
of
the alphabetic characters
1-9 are
used
in
checking
or
verification.
Special
characters
cannot be
checked. Alphabetic
characters, spaces,
and zero-punched
columns
can
intervene
only
if
they
were
considered
part
of
the
basic
code
number when
the
check
digit
was
estab-
lished.
Columns
may
be auto-skipped within
a self-check
field.
However, they do not
calculate in
the
checking
operation,
if
auto-skipped.
If
a self-check
number
was
calculated using
spaces,
it
must be keyed
using
spaces,
or
an
error occurs.
Auto
skip
may
not be used
in
place
of
a
space
that
was
in
the
original
calculation.
If
the
number was
calculated
without
spaces
(all
digits)
then auto
skip
of
a
single
position
on
the
IBM
129
may
be used
to create a
visual
space
in
the
number,
for
convenience
in reading,
and
the
calculation
checks
OK.
If
the self-check
field
is
the
last
manual
field
in
the
card,
an
error
condition prevents the
column
indicator
from
advancing
beyond
the
error
column.
In
this
way,
operation
of procedure
A
or
B
can be
applied to the
last
self-check
field.
More
than
one
self-checking
field
may
be checked
per
card.
The
self-checking
fields
may
be
adjacent
fields. If
an
error
condition
requires the use
of procedure
A
for
single
fields
or
the use
of procedure
B, the
1
1-punch
in
column
8
does not
occur. Program-level
changes during keying
do
not
alter
the
condition required
for
the
1
1-punch
in
column
81;
that
is,
all
self-check
fields
encountered
must
be
correctly
keyed,
or duplicated
under program
control,
and
no
invalid
SC
field
that prevents the
1
1-punch
in
column
81
can be
in
the record.
If a valid
SC
field
has
been
correctly
keyed
in
punch
mode,
then backspaced
over,
then skipped forward,
an
1
1-punch
in
column
81 occurs
(if
not
inhibited
by
any
other
invalid
SC
field).
If
the
REL
key
is
pressed
after
the correct
keying of
a
self-check
field,
the
1
1-punch
is
entered
in
column
81.
If
the following section
of
the card should
have contained
a
second
self-check
field,
that
area
of
the
card
is
not
punched, and
the
machine
stops
in
the
units
position
of
the
SC
field.
The
operator
may
then
either
backspace
and key
the
SC
field,
or use
procedure
A
or
B. If
procedure
A
is
used, the
1
1-punch
indicates that
the
first
SC
field
punched
is
correct.
When
the
first
column
of
a self-check
field
is
reached
and
the
machine
has automatically switched
to self-check
mode,
if
the operator decides to
change
the
program
level,
the
shift in
program
negates the previous condition
and
the
new
program
is
in effect.
Manual
or
automatic
duplication
of an
SC
field
performs
the
SC
calculation.
Partial
automatic
or
manual
duplication
of
the high-order position
of an
SC
field
may
be done
by
programming.
Manual
duplication
from
the
first
manual
column
is
permitted.
Partial
automatic
duplication pro-
gramming
operates for the high-order positions only.
Manual
or
automatic
skip
of an
SC
field
in
punch
mode
supersedes the
self-check,
and no
calculation occurs.
Special
Features
5
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