ibm 602 the ibm 602 calculating punch introduced in 1946 was an electromechanical calculator capable of addition subtraction multiplication and division the 602 was ibms 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 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 model machinecyclesper minute programsteps 12digitstorageunits 6digitcounters 4digitcounters functions 1 200 12 6 3 3 2 200 12 6 3 3 50 150 6 4 3 1 51 150 6 4 3 1 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 ibm 603 ibm 604 ibm 608 ibm january 1960 ibm reference manual 602 calculating punch pdf a2205061 columbia university computing history the ibm 602 calculating punch 