Texas Instruments TI-81
The Texas Instruments TI-81 is a programmable calculator with 10 digits precision and formula input logic. It has 50 keys, and an LCD (liquid crystal) display. The power source is 4xAAA + CR1620 3V. The calculator was manufactured in Taiwan.
Facts at a glance:
| Feature | Value |
|---|---|
| Type | Programmable |
| Keys | 50 |
| Precision | 10 |
| Logic | Formula |
| Display type | LCD |
| Display size | 96 |
| Length | 174mm |
| Width | 81mm |
| Thickness | 21mm |
| Power Source | 4xAAA + CR1620 3V |
| Country | Taiwan |
| Original price | $110 |
| Year introduced | 1990 |
| Year discontinued | 1996 |
Diagnostics
Note that diagnostic tests generally delete any data on the calculator. Be sure to back up any important information held in the calculator before running these tests.
Press 2nd, TEST, ALPHA and S keys simultaneously. Press ENTER when prompted.
Replacements:
If you have a Texas Instruments TI-81 that is no longer working, you can first try replacing the 4xAAA + CR1620 3V. 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: