I offer you an overview of the VK-2 electromechanical adding machine. Although this is not a computer in the modern sense, it also refers to computing devices. The name stands for Keyboards Calculator, the second model. The word "keyboard" in the name is intended to emphasize one of the main advantages of the machine - entering numbers and operations using the keys. What's so special about that?
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A short video demonstrating how it works.
What happens in the video: calculate (758.36 + 44.20 - 356.99) * 125.74 / 14.01.
We reset the counters, reset the drum. We enter the number 758.36, add 44.20 to it, we get the intermediate result 802.56. Then we subtract 356.99 from it (intermediate result 445.57). We re-type the result on the drum, reset the counters and multiply it by 125.74 in semi-automatic mode. Correct the result, we get 56025.9718. We recruit this number on the reel, transfer it to the left side and divide by 14.01. We get the final result 3998.9987.
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