Commodore SR4921 RPN
The Commodore SR4921 RPN is a scientific calculator with 8 digits precision and RPN (reverse polish notation) logic. It has 27 functions, 49 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is PP3 9V. Note: RPN version of SR4912.
Facts at a glance:
|Power Source||PP3 9V|
If you have a Commodore SR4921 RPN 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: