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The IBM 602 Calculating Punch, introduced in 1946, was an electromechanical 
Program steps execute in one machine cycle, except for steps performing multiplication or division which take as many machine cycles as needed for the operation. Punching rate is roughly four columns per machine cycle. The total number of machine cycles required per card varies depending on the data and programming.
Programming the 602 for each problem involved two things:
#A ''control panel'' wired for the sequence of the calculation
#A ''Skip Bar'' with "inserts" placed for the first column of each field to punch
Columbia University Computing History: The IBM 602 Calculating Punch
602 Programmable calculators Computer-related introductions in 1946
calculator
An electronic calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics.
The first solid-state electronic calculator was created in the early 1960s. Pocket-si ...
capable of addition, subtraction, multiplication, and division. The 602 was IBM
International Business Machines Corporation (using the trademark IBM), nicknamed Big Blue, is an American Multinational corporation, multinational technology company headquartered in Armonk, New York, and present in over 175 countries. It is ...
's first machine that did division. (The IBM 601, introduced in 1931, only multiplied.) Like other IBM calculators, it was programmed using a control panel. Input data was read from a 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 ...
, the results could be punched in the same card or a trailing card.
The 602 was available in four models: Model 1, Model 2, Model 50, and Model 51. The "Series 50" models were low-cost versions that ran at a slower speed, with half as many program steps, and fewer storage registers and counters.
Two additional counters were available as an optional feature.
Program steps execute in one machine cycle, except for steps performing multiplication or division which take as many machine cycles as needed for the operation. Punching rate is roughly four columns per machine cycle. The total number of machine cycles required per card varies depending on the data and programming.
Programming the 602 for each problem involved two things:
#A ''control panel'' wired for the sequence of the calculation
#A ''Skip Bar'' with "inserts" placed for the first column of each field to punch
See also
* IBM 603 * IBM CPC **IBM 604
The IBM 604 Electronic Calculating Punch was the world's first mass-produced electronic calculator along with its predecessor the IBM 603.
** IBM 605
* IBM 608
The IBM 608 Transistor Calculator, a plugboard-programmable unit, was the first IBM product to use transistor circuits without any vacuum tubes and is believed to be the world's first all-transistorized calculator to be manufactured for the commerc ...
References
*{{cite book , last = IBM , title = IBM Reference Manual: 602 Calculating Punch , id = A22-0506-1 , date = January 1960 , url = http://www.bitsavers.org/pdf/ibm/602/A22-0506-1_602_Jan60.pdfExternal links
Columbia University Computing History: The IBM 602 Calculating Punch
602 Programmable calculators Computer-related introductions in 1946