Texas Instruments TI-21
The Texas Instruments TI-21 is a scientific calculator with 8 digits precision and algebraic logic. It has 25 functions, 40 keys, and an LCD (liquid crystal) display. The power source is 2xAA batteries. The calculator was manufactured in Taiwan.
Facts at a glance:
| Feature | Value |
|---|---|
| Type | Scientific |
| Functions | 25 |
| Keys | 40 |
| Precision | 8 |
| Logic | Algebraic |
| Display type | LCD |
| Length | 155mm |
| Width | 76mm |
| Thickness | 18mm |
| Power Source | 2xAA batteries |
| Country | Taiwan |
| Year introduced | 1982 |
| Year discontinued | 1982 |
Replacements:
If you have a Texas Instruments TI-21 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: