The IBM Type 602 Calculating Punch, 1946. This electromechanical device
performed addition, subtraction, multiplication, and division on data read
from its built-in card reader, punching the results on the input cards
themselves, or on subsequent cards, according to instructions from its plugboard program. Speed: 100 cards per minute.
This was the first IBM machine to perform division.
The 602 did not perform reliably in the field, and by 1948
was upgraded to the 602-A (a "602 that worked", designed by George
Daly). This was the last of IBM's electromechanical calculators. The
-A model is distinguishable from the original 602 by its V-necked input-card
hopper, the little viewport above the output hopper, centered nameplate, and
lower-slung racing stripe. It also had an entirely different control panel.
For another photo of the 602-A and a bit more description, see the Ellie Krawitz paper . To see a typical 602-A control panel
wiring diagram (in this case for crossfooting), CLICK HERE.
Technical papers and manuals of the 1940s and 50s were full of plugboard
wiring diagrams such THIS ONE, from "Mass Spectrometer
Calculations on the IBM 602-A Calculating Punch" by W.H King Jr. and William
Priestley Jr., in .
The IBM Calculating Punch Type 602-A, Principles of
Operation, 10th Edition, Form 22-5489-10 (Aug 1955), and other editions and
manuals for the 602 and 602-A.