The Elektronika MK-90 is a graphing calculator with 8 digits precision and algebraic logic. It has 63 keys, and an LCD (liquid crystal) display. The power source is 4xAA. Note: Can use MK 92 printer and cassette interface.
Facts at a glance:
If you have an Elektronika MK-90 that is no longer working, you can first try replacing the 4xAA 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: