Neckermann electronic dc6+6

---

One of the first own-brand calculators in the Neckermann catalog store in 1972 was the electronic dc6+6 with a 6-digit display. The soul of the machine is the 12-digit precision chip manufactured by MOSTEK, which works in a fixed two-decimal setting, but is also a version that can be switched to a fixed 0-decimal point. The machine has a very simple structure; unfortunately, the american-made keyboard with an extremely simple design is one of the most unreliable version due to the oxidation of metal contacts. Interestingly, although the chip is capable of displaying a negative sign, this option was not used by the designers of the machine, so negative numbers cannot be distinguished from positive ones.

You can read more about this and competing six-digit models in our special article.