The IBM 1402 was a high speed card reader/punch introduced on October 5, 1959 as a peripheral input/output device for the

IBM 1401 The IBM 1401 is a 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 processing data stored on pu ...

computer. It was later used with other computers of the

IBM 1400 series The IBM 1400 series were 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 The IBM 700/7000 series is a series of large-scale (mainframe) computer systems that were made by IBM through the 1950s and early 1960s. The series includes several different, incompatible processor architectures. The 700s use vacuum-tube log ...

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

IBM 1620 The IBM 1620 was announced by IBM on October 21, 1959, and marketed as an inexpensive scientific computer. After a total production of about two thousand machines, it was withdrawn on November 19, 1970. Modified versions of the 1620 were used as ...

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 that was announced by IBM on April 7, 1964, and delivered between 1965 and 1978. It was the first family of computers designed to cover both commercial and scientific applica ...

product line.

Specifications

Card reader

* Card read speed up to 800

punched card A punched card (also punch card or punched-card) is a piece of stiff paper that holds digital data represented by the presence or absence of holes in predefined positions. Punched cards were once common in data processing applications or to di ...

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 (link will display the full calendar) of the Julian calendar. Events January–December * January 29 – King Jogaila of the Poland–Lithuania Union answers the rumblings a ...