IBM 129 Description page 29

ACCUMULATE (Requires Expansion Feature as
Prerequisite)
The accumulate feature provides the ability to balance to a
predetermined total, to create a hash total for a group of
cards or a batch of work, or to crossfoot and punch totals
in the same card or. in a following card, under program
control.
Accumulate consists of three 14-position, individual
accumulators that add any numeric manually keyed or
duplicated fields, in punch or verify mode, into any
accumulator, under program control. The maximum size of
the input field is 14 positions, and any total beyond the
14th position will carry into the 15th position, and will
maintain a valid total up to 19 positions. A minus
accumulate condition occurs if an 11-punch is multi-
129 Card Data Recorder/Machine Description
28
punched in units position. Amounts to be accumulated in
punching can be entered only by keying or duplicating, not
by a data read operation.
Operation
Accumulate arithmetic occurs only after entire record has
been keyed; therefore, there are no restrictions on the use
of any backspace functions during keying. Any field can be
programmed to add into any or all accumulators.
In verify mode, only verified correct data is accumulated,
and total fields are automatically verified for accuracy. An
error in an automatically verified
total
field is indicated by
AC on column indicator. The correction card that is
punched will contain the correct totals based on all verified
data.