The IBM 1402 was a high-speed card reader/punch introduced on October 5, 1959 as a peripheral

input/output In computing, input/output (I/O, i/o, or informally io or IO) is the communication between an information processing system, such as a computer, and the outside world, such as another computer system, peripherals, or a human operator. Inputs a ...

device for the

IBM 1401 The IBM 1401 is a variable word length computer, variable-wordlength decimal computer that was announced by IBM on October 5, 1959. The first member of the highly successful IBM 1400 series, it was aimed at replacing unit record equipment for pr ...

computer. It was later used with other computers of the

IBM 1400 series The IBM 1400 series are second-generation (transistor) mid-range business decimal computers that IBM marketed in the early 1960s. The computers were offered to replace tabulating machines like the IBM 407. The 1400-series machines stored infor ...

and IBM 7000 series product lines. It was adapted as the IBM 1622 Card Read-Punch for the

IBM 1620 The IBM 1620 was a model of scientific minicomputer produced by IBM. It was announced on October 21, 1959, and was then marketed as an inexpensive scientific computer. After a total production of about two thousand machines, it was withdrawn on N ...

IBM Archives: 1620 Data Processing System
/ref> and provided the basic design for the models 2501, 2520 and 2540 equipment used with the

IBM System/360 The IBM System/360 (S/360) is a family of mainframe computer systems announced by IBM on April 7, 1964, and delivered between 1965 and 1978. System/360 was the first family of computers designed to cover both commercial and scientific applicati ...

product line.

Specifications

Card reader

* Card read speed up to 800

punched card A punched card (also punch card or punched-card) is a stiff paper-based medium used to store digital information via the presence or absence of holes in predefined positions. Developed over the 18th to 20th centuries, punched cards were widel ...

s per minute (models 1, 2 and 3) or 450 cards per minute (models 4, 5 and 6). * Card input file for 3,000 cards (models 1, 2, 3, 4 and 6) or feed hopper for 1,200 cards (model 5). * Three stackers (NR, 1, 2/8) with approximately 1,000-card capacity hold cards after they are read.

Card punch

* Card punch speed up to 250 cards per minute (all models). * Feed hopper for 1,200 cards (all models). * Three stackers (NP, 4, 2/8) of approximately 1,000-card capacity after cards are punched. The 2/8 stacker is shared by the card reader and punch, but timing considerations make it difficult to use for merging operations. * Option to read from the punch feed.

Punched card format

The 1402 uses IBM 80-column

format, although an option was available to process 51-column cards. A column binary option allowed cards with any combination of holes to be read and punched.

Error checking

Both the reader and punch mechanisms count the number of holes in each column at a separate station. An error is indicated and the mechanism stops (if the I/O check stop switch is on) if the number of holes counted at the read station differs from the number of holes counted at the first, check station (for reading) or punched at the first station (for punching). In addition, when not operating in column-binary mode, the reader indicates an error and stops (if the I/O check stop switch is on) if the punch combination in any column does not indicate a valid character.

Notes

{{IBM midrange computers

1402 Year 1402 ( MCDII) was a common year starting on Sunday of the Julian calendar. Events January–March * January 29 – King Jogaila of the Poland–Lithuania Union answers the rumblings against his rule of Poland, by marrying A ...