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a
field
has
been
programmed
for
numeric punching
by
having
a
blank
in
the
first
column
and 12-punches
in
all
other
columns
of
that
field.
The
first
field
can be used
as a
left-zero
field.
Key
all
significant
digits,
then
press the
LZ
bar.
The
digits
are
right-justified,
and
leading zeros
are
automatically
punched.
(When
the
LZ
bar
is
pressed, the
system
notes
that the
shift in this
case
was
numeric;
thus,
the
left-field
fill
is
made
zeros.)
Note
that leading zeros are
automatically print-suppressed.
For
an
all-zero
field,
key
one
zero,
then
press
the
LZ
bar.
Note
that
because
left
blanks
are
obtained
via
alphabetic
shift,
there
cannot be
a
minus
over the
units
in
a left-blank
field
via a single-key
depression
(minus
over
units
in a
left-zero
field
is
with
the
-LZ
key,
which
is
numeric
shift).
To
obtain
a
minus
over
the units
and
the
left-blank
fill,
first
key
the
digits,
multipunch
the
minus and
units-position
digit,
and then
use the
ALPHA
manual
shift
key and
the
LZ
bar.
This
results in
a
minus
over the
units
and
a left-blank
field.
Duplicating or
Skipping
LZ
Fields
Because
program
coding
is
not
needed
for
LZ
punching,
the
machine
considers the
field
as
a
manual
field
until
the
LZ
bar
is
pressed.
Therefore
there
are
no
restrictions
to
skipping or duplicating
a
field
that
is
normally
punched by
a
manual
LZ
operation.
Skipping
or duplicating occurs
normally
(LZ
bar not
used).
Duplicating or skipping should
be
from
the
start
of
the
field,
to
ensure data
validity,
proper
data alignment or
a
completely blank
field.
Alphabetic
Shift
in
LZ
Fields
Alphabetic
or
numeric
data
is
valid in
an
LZ
field,
and
the
shifting
of
significant
data
and
zero
fill
occurs
whether
the
data
is
alphabetic,
numeric, or
special characters.
Pressing
the
LZ
bar (or
-LZ
key)
in
numeric
shift
(manual
or
program)
results in
a
left-zero,
or
minus
left-zero
operation,
respectively. Pressing
the
LZ
bar
in
alphabetic
shift
(manual
or
programmed)
results in a
left-blank
fill
operation;
that
is,
data
is
shifted,
and
blanks
are inserted to
the
left.
Because
the
—
LZ
key
is
a
numeric
shift
key
only, a
"minus
left-blank"
field
cannot be obtained
by
a
single
keystroke.
If desired,
key
the
last
significant
digit,
and
the
minus, with
a
MULT
PCH
operation;
then
use the
ALPHA
shift
key and
the
LZ
bar
to
cause
a regular left-blank
fill
operation,
in
which
(because of the
MULT
PCH
operation) the
units
position has a
minus
over the
digit.
Minus
Printing
The
IBM
129 Models 2
and
3
print
only those
characters
that are in
the 64-character
set.
Combinations
of
punches
that are
not
a part
of
the
64-character
set
have
printing
suppressed during a punch-print operation.
When
a
minus
over
a digit
1
through 9
is
used
to
denote
a
minus column
or
field,
that
punch
combination
(11
and
1
through
9)
prints
as
the alphabetic characters
J
through R, because
there
is
no
way
to distinguish
them from
those alphabetic
characters.
However,
the
combination
11-0,
which would
represent
a
minus
over
a
zero,
is
not one of
the
valid
64
characters; therefore,
an
1
1-0
combination
of
punches does
not
print
(even
if
keyed
via a
MULT
PCH
operation).
Use of
REL
in
Punching
The
REL
key
is
used
in
punching
when
there
is
no
further
keying
necessary
in
a record;
it
writes spaces into input
storage,
and
eliminates the
need
to
manually
skip
several
individual
fields.
When
REL
is
pressed,
any
fields
following,
that
are
programmed
for
automatic dup, perform
the
auto-dup operation
if
AUTO
SKIP/DUP
is
ON.
Thus
the
data
is
duplicated
from
record
to
record.
If
AUTO
SKIP/DUP
is
OFF,
the
field
has
spaces.
If
the
dup
data
must
be
recreated, use
a data
read operation,
or
manually
key
the
data
into
the
next
record
with
AUTO
SKIP/DUP
turned
OFF,
and
set
the
switch
ON
for
the
records
that follow.
Backspace and
Error Correction
Because
the
IBM
1
29
has
an input
storage
for
keying
in data,
an
error
keystroke
in
punching does not immediately
punch
(hence
spoil)
the
card.
Errors detected
by
the operator
during
punching
operations
may
quickly
and
easily
be
corrected
by
a
backspace and
rewrite
operation.
For
maximum
operator
ease
and
convenience, four backspace
operations
are
provided
for
error correction:
character,
word,
field,
or record.
Each
has
its
optimum
use;
choose
the
one which
best
serves
your
individual
condition
or
preference.
Remember
that a
backspace operation does not change
the
program
level in
which you
are operating.
If
you
start a
record
in
program
level
1,
shift
to
program
level
2,
and key
several
more
fields,
and
you
then
record backspace,
the
machine
remains
in
program
level
2
.
To
return to
program
level
1
,
perform
a
manual program
selection.
To
correct the
last
manual column of
a
record (before
it
punches
into
the
card)
set
REC
ADV/CARD FEED
to
MANUAL.
When
the
last
manual column
has
been
keyed,
the
column
indicator
shows
00;
CHAR
BKSP
(or
any
other
backspace)
may
be used
to
return to
any
position
of input
storage.
If
no
correction
is
necessary,
set
REC ADV/CARD
FEED
to
AUTO,
or
perform
a
manual program
selection,
and
press
FEED
to
continue
operation.
Because of
fast
and
easy
error
correction (using
any
of
the
four types of backspace),
keying
is
faster,
more
rhythmical and
more
continual
because an
error
keystroke
does
not
spoil
a
card.
Simply backspace and
rekey.
Therefore,
production
can
increase
since
storage-error
correction
has
made
keying
easier
and
faster,
and
has
eliminated "error cards"
from
the
work.
26
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