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SELF-CHECKING
NUMBER
FEATURE
(MODULUS
10
AND
11)
(This feature
requires
the
expansion
feature
as
a
pre-
requisite.)
The
self-checking
number
feature
provides
a
means
of
verifying
precoded numeric information
at
the
same
time
as
it
is
keyed.
A
precomputed
self-check
character
(digit)
is
added
at
the
low-order
end
of
the
field
before the data-recording operator
receives the job.
This
means
the source
document
requires
one
more column
than
the
original
data.
To
the operator, the
field
appears
as
simple
numeric
data;
the
self-check
digit
cannot be
told
from any
other
digit,
except
that
it is
always the
last
(units
position)
digit
of
the
complete number.
Indicator Light
and
Reset
Key
The
self-check
light
is
labeled
SC on
Model
2,
and
SC/VER
on Models
1
and
3.
(See Figure
13.)
The
verify
/self-
checking-number
reset
key
(VER RES
on Models
1
and
3)
is
labeled
VER
SC on
the
Model
1
and
3
machines with
this
feature.
It
is
labeled
SC
RES
on
the nonverifying
Model
2
machines with
this
feature.
Punch
Procedure
If
the
card-punch operator
is
not
involved
in
coding the
self-cheek
"
digit
(ordinarily
done
before the source docu-
ment
is
handed
to the
card-punch
operator),
then
it
is
sufficient
that the
card-punch operator
knows
that a certain
field
has
been
self-check-digit
coded.
The
keying of
the
numeric
data
in
the
field
is
the
same
as for
any
other
numeric
field;
the
appearance
on
the source
document and
on
the
punched
card
is
no
different.
It
is
only
when
the
self-check
option
is
in use,
and
the
particular
field
has
been
programmed
for self-check that the
system responds
differ-
ently for that
field.
Detailed
coding information,
and
the
differences
between modulus
10
and modulus
11
(not
significant
in
punch
operation)
are
described
later
in this
section.
The
operator
keys
the
numeric
data
as
it
appears
on
the
source
document. Assuming
the
self-check
digit
(previously
computed on
the
source
document)
is
correct
and
the
numeric
data
is
keyed
correctly,
the
keying operation
is
not
interrupted.
If
no
errors are
detected
throughout
the
keying
of
all
the
self-check
fields
in
the
card,
an 11-punch
is
automatically entered
in
column
81.
If
the
self-checking
number
field
is
keyed
incorrectly,
when
the self-check
digit
in
the units position
of
the
number
is
keyed,
the
keyboard
locks
and
the self-check
Indicator Light
PUNCH
VERIFY
ON
OFF
AUTO
SKIP/DUP
AUTO
MANUAL
REC/CARD
ADV/
FEED
Without
Self-check
With
Self-check
Models
1
and
3
Verify
scAer
Model
2
Not
Installed
SC
Reset
Key
!
INPVHKg
Without
Self-check
With
Self-check
Models
1
and
3
VER
RES
VER
SC
Model
2
blank
SC
RES
Figure
13.
Indicator Light
and
Reset
Key
light
turns on.
To
correct
this
condition, the operator
presses
FIELD/WORD
BKSP.
Pressing
this
key
unlocks
the
keyboard,
turns off the self-check
light,
and
returns the
column
indicator to the
first
column
of
the
self-check
field.
In
this
way,
the
operator can
again
key
the self-checking
numeric
field. If
the
next keying of
the
same
field
checks
OK,
normal
operation continues.
Note:
Character backspace does not
reset this
type of
error
condition.
50
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