If you are of a certain age with a predisposition to numbers, Hewlett Packard calculators are likely to conjure favourable memories.

The 12c for the actuaries, the 15c for engineers, the 41c for geeks who solved Rubik’s cube one handed behind their backs before breakfast.

In recent times, HP calculators deteriorated in quality to the point of unusability. The business outsourced manufacturing to China and the rest is history. Garbage came back with a bitter taste.

But, HP emulators are available from app stores. You can pay a tiny price and put a 41c on your phone, bypassing the horrendous lack of quality from Chinese hardware. It’s almost like old times.