Olympia CD 90 SIGMA
The Olympia CD 90 SIGMA is a scientific calculator with 8 digits precision and algebraic logic. It has 23 functions, 29 keys, and a VFD (vacuum fluorescent) display. The power source is 3xAA. The calculator was manufactured in Japan.
Facts at a glance:
If you have an Olympia CD 90 SIGMA that is no longer working, you can first try replacing the 3xAA batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent.
We suggest the following current model as a replacement: