Hewlett-Packard HP 55 (Classic MERLIN)
The Hewlett-Packard HP 55 is a programmable calculator with 12 digits precision and RPN (reverse polish notation) logic. It has 75 functions, 35 keys, and an LED (light-emitting diode) display typical of calculators of this era. The power source is 3xAA NiCd pack.
Facts at a glance:
| Feature | Value |
|---|---|
| Type | Programmable |
| Functions | 75 |
| Keys | 35 |
| Precision | 12 |
| Logic | RPN |
| Display type | LED |
| Length | 147mm |
| Width | 81mm |
| Thickness | 33mm |
| Weight | 255g |
| Power Source | 3xAA NiCd pack |
| Year introduced | 1975 |
| Year discontinued | 1977 |
Replacements:
If you have a Hewlett-Packard HP 55 that is no longer working, you can first try replacing the 3xAA NiCd pack. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent.
We suggest the following current model as a replacement: