Radio Shack EC-421
The Radio Shack EC-421 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 12 functions, 29 keys, and a VFD (vacuum fluorescent) display. The power source is 2xAA batteries.
Facts at a glance:
| Feature | Value |
|---|---|
| Type | Arithmetic |
| Functions | 12 |
| Keys | 29 |
| Precision | 8 |
| Logic | Algebraic |
| Display type | VFD |
| Length | 133mm |
| Width | 76mm |
| Power Source | 2xAA batteries |
| Year introduced | 1976 |
| Year discontinued | 1978 |
Replacements:
If you have a Radio Shack EC-421 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 models as possible replacements: