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Basic
number:
943457842
Write
digits
of
basic
number:
9
4
3
4
5
7
8
4
2
From
right to
left,
write
checking
factors:
4
3
2
7
6
5
4
3
2
Add
the products:
36
+
12+6+28+30
+
35
+
32 +
Total
195
12
+ 4 =
Divide:
195 divided by
1
1
=
17
plus
a remainder
of 8
Subtract:
8
subtracted
from
11=3
(the
check
digit)
The
new
self-checking
number
is:
9434578423
Figure
16.
Example: Modulus
11
Figure
17.
Direct
Punch
Switch Panel Markings
When
the calculations
on
the
basic
number
result in
a
check
digit
of
11, the
digit
can be
substituted
and
appended
to the basic
number
to
make
a valid self-checking
number.
Eleven
and
zero
have the
same
value
in
this
part
of
the
calculation.
The
weighting
factors
(X7, X6,
X5, X4, X3,
X2) and
the arithmetic process
utilized in calculating
the
check
digit
for
modulus
1 1
are
shown
in
Figure
16.
DIRECT
PUNCH CONTROL
AND
VERIFY
READ CONTROL
These
features, available
on
machines with
serial
numbers
2xxxx
and
higher,
allow the
customer
to control
card
motion
through programming,
so that
source
document
card
visibility
similar
to that
of
the
IBM
29/59
may
be
obtained.
This
allows source
document
punching and
verifying
on
the
IBM
129 without
the
need
to redesign the
source cards
from
those
used
on
the
IBM
29/59.
The
direct
punch
feature
also
allows the
casual user
of
the
IBM
129
to operate
in a direct
punch
mode
without
programming,
or
with
programmed
buffer
action,
if
desired.
Feature Description
Two
features are
available:
1.
Direct
punch
control,
which
operates
under
switch
and
optional
program
control
on
Models
1
,
2,
and
3, in
punch mode.
2.
Verify
read
control,
which
operates
under program
control only,
on
Models
1
and
3,
in
verify
mode.
The two
features
are
independent of each
other,
and
may
be
installed
separately,
or together,
without
limitation.
There
are
no
installation
limitations
with any
other
features,
although
there
are
operating
limitations
for
self-checking
number
and accumulate
when
direct
punch
control
is
used.
Direct
Punch
Control Operation
On
Models
1
and
3,
the
PUNCH/VERIFY
switch
is
a
three-position switch, labeled
PUNCH-DIR
PCH-VERIFY.
When
the switch
is
set
to
PUNCH
or
VERIFY,
operation
is
normal;
when
the switch
is
set
to
DIR
PCH,
each keystroke
causes
direct
punching
and/or card motion. (See
Figure
17.)
On
Model
2,
the
unused
PUNCH/VERIFY
switch
loca-
tion
has
a
switch
labeled
PUNCH-DIR
PCH.
When
the
switch
is
set
to
PUNCH,
operation
is
normal;
when
the
switch
is
set
to
DIR
PCH;
each keystroke
causes
direct
punching and/or
card
motion.
For
operator's
convenience, the switch should
be
set
to
DIR PCH
only
in
column
01,
after
a card
has
been
registered.
However, machine
operation responds
to
the
switch
at
any
time.
Card motion can
be
controlled
by
a
3-punch
in
the
program
card,
which
is
recognized
only
in
punch
mode
during a direct-punch operation.
The
customer
is
respon-
sible
for
program
card handling to prevent the
3-punch
for
LZ
verify
from
interfering
with
punch-direct operation.
Note
that
a
programmed
LZ
verify
field
causes "buffering"
in
direct
punch, due
to the
3-punch
in
the high-order
position.
The
3-punch
in
the
units position
is
ignored.
A
3-punch
in
the
first
column- of
a
field
inhibits
card
motion and
causes that
field
to operate
as
a "buffered"
field;
that
is,
each keystroke
enters
the
buffer,
and,
at
the
conclusion
of
the
field
when
the
first
following
non-
buffered keystroke
is
made,
the "buffered"
field
then
punches
into the card.
Keying of
the
nonbuffered
field
can
continue,
in
a
"pseudo-buffer"
mode,
until
the
punching
of
the card catches
up
to the
keying,
at
which
time
direct-
punch
action again occurs.
The
"pseudo-buffer"
mode
occurs within a card only;
it
does not occur
between
consecutive
cards.
Adjacent
fields
may
have
a
program code
three
in
the
first
column
to cause
continuation
of
the buffer action, accord-
ing to the
program
card.
Special
Features
57
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