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Technical Newsletter File No. 1440-01
Re: Form No. A24-3117-0
This Newsletter No. N24-0219
Date: June 15, 1964
Previous Newsletter Nos. NONE
Replacement pages for Miscellaneous Input/Output Instructions, ruM 1440 Data
Processing System, Form A24-3117-0.
To bring your publication up to date, please replace the following pages with the
corresponding pages attached to this Newsletter. Changes are identified by a ver-
tical line at the left of the affected text and a dot (.) at the left of an affected
figure.
Pages
21 and 22
23 and 24
31 and 32
33 and 34
CI 35 and 36
File this Newsletter at the back of the manual. It will provide a reference to changes,
a method of determining that all amendments have been received, and a check for
determining if the bulletin contains the proper pages.
The last page of the Technical Newsletter is a Reader's Survey included for your
comments regarding this manual (A24-3117-0). We solicit your participation in this
survey so that we can attain our goal of providing you with publications of the highest
quality. If you wish to complete the survey later, it may be inserted in the manual
follOWing page 44. When mailed in the United States, no postage is required.
l
I I
I
c International Business Machines Corp., Product Publications Dept., Endicott, N. Y.
PRINTED IN U. S.A.
N24-0219 (A24-3117-0)
:0
,(---'"'-
, II'
IBM 1442 Card Read-Punch
This section describes the instructions the IBM 1440 Core Storage
Data Processing System uses to control the: IBM 1442 ...
:
Card Read-Punch, and the IBM 1442, Model 4, Card " : Readoa' 2
Readout During
Read Cycle 2
Reader. The IBM 1442, Model 4, Card Reader operates
under the control of the same read and stacker instruc-
I Check
tions as the IBM 1442 Card Read-Punch. Readout 1
The data How for the IBM 1442, Model 4, Card
Reader is the same as the read operation on the IBM Translation Circuitry
1442 Card Read-Punch.
I Read -Back Read Cycle 1
I
Data Flow I
I Read Cycle 21
The card path and data How for the IBM 1442 Card
Read-Punch (Figure 31) is shown in Figure 32. The
cards are placed in the 1,200-card capacity hopper face
down, 9-edge first. The first card cycle moves the card
from the hopper to the read station where it is regis-
tered at column zero. During the second card feed Punch Station Read Station
cycle, the card is fed to the reading station by a READ
CARD instruction. This operation causes each card col-
umn to be read twice as the card moves by the reading
station column-by-column.
Optional Stacker
During read cycle 1, the punched-card code for a
(Standard on Model 2)
column is translated to BCD code and stored in core-
storage positions specified by the B-address of the
Figure 32. IBM 1442 Card Read-Punch Data Flow
READ CARD instruction. On read cycle 2, the punched-
card code for the same column is read a second time.
The resultant BCD-coded character from the second into storage from the first read cycle. If no error is de-
reading is compared to the BCD-coded character read tected, the process continues for each column until a
group-mark with a word-mark is detected at the end of
the B-field.
After the read operation is completed, the card is
registered in column 1 at the punch station.
During the third card-feed cycle, which is started by
a PUNCH AND FEED instruction, the BCD-coded charac-
ters to be punched are read from core storage, trans-
lated to punched-card code, and punched column-by-
column into the card at the punch station.
A second core-storage readout cycle occurs that com-
pares the BCD characters in storage to the BCD trans-
lation of the punched-card code punched in the card.
If no error is detected, this operation continues for the
length of the B-field in storage identified by a group-
mark with a word-mark.
When the card leaves the punch station, it is car-
ried to the stacker by a continuously-moving mecha-
nism.
Card Read-Punch Instruction Format
All card read-punch operations are initiated by a card
c read-punch instruction. This instruction can initiate
different card read-punch operations by using specific
characters in certain locations of the actual instruction
Figure 31. IBM 1442 Card Read-Punch (Figure 33).
21
Fonn A24-3117-0
Page Revised 6/15/64
by TNL N24-0219
The data punched in card column 1 is translated
o
. . - - - - - - - - - - - - General Mode of Operation
M-Move Mode(No word marks
involved}
and stored in the core-storage position specified by
the B-address. The rest of the data punched in the
~--------- Operating Input/Output Unit card is transferred, column-by-column, into the ad-
%G - Card Read - Punch
jacent core-storage positions until a group-mark with
~-------- Unit Number a word-mark in core storage is sensed. The number
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