The Omron 865R is a scientific calculator with algebraic logic. It has a VFD (vacuum fluorescent) display. The power source is 2xAA.
Facts at a glance:
If you have an Omron 865R that is no longer working, you can first try replacing the 2xAA 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: