National Semiconductor 842
The National Semiconductor 842 is an arithmetic calculator with algebraic logic. It has an LED (light-emitting diode) display typical of calculators of this era. The power source is PP3 9V.
Facts at a glance:
| Feature | Value |
|---|---|
| Type | Arithmetic |
| Logic | Algebraic |
| Display type | LED |
| Length | 152mm |
| Width | 76mm |
| Power Source | PP3 9V |
Replacements:
If you have a National Semiconductor 842 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 models as possible replacements: