Unimark 280
The Unimark 280 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 7 functions, 23 keys, and one of the early LCD (liquid crystal) displays which incorporated a yellow filter. The power source is 4x1.35V cell.
Facts at a glance:
| Feature | Value |
|---|---|
| Type | Arithmetic |
| Functions | 7 |
| Keys | 23 |
| Precision | 8 |
| Logic | Algebraic |
| Display type | YLCD |
| Length | 127mm |
| Width | 72mm |
| Thickness | 12mm |
| Power Consumption | 0.001000W |
| Power Source | 4x1.35V cell |
| Year introduced | 1975 |
Replacements:
If you have a Unimark 280 that is no longer working, you can first try replacing the 4x1.35V cell. 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: