Novus 650 (mathmate ; mathbox)
The Novus 650 is an arithmetic calculator with 6 digits precision and RPN (reverse polish notation) logic. It has 4 functions, 15 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is PP3 9V.
Facts at a glance:
|Power Source||PP3 9V|
If you have a Novus 650 that is no longer working, you can first try replacing the PP3 9V battery. 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: