HP 39/40 series

All calculators in this series are aimed at high school level students and are characterized by their ability to download (via cable or infrared) APLETs or E-lessons.

These are programs of varying complexity which are generally intended to be used in the classroom to enhance the learning of mathematics by the graphical and/or numerical exploration of concepts.

Unlike its "bigger brothers", the HP 40g has no flags to set/mis-set resulting in a "better behaved" calculator for straightforward math analysis.

The CAS component of the HP 40G's operating system appears to have been totally removed, rather than simply being hidden at start-up.

It is built around an 80 MHz Freescale (formerly SigmaTel) STMP3770 processor with ARM926EJ-S core and features 256 KB RAM and 128 MB flash memory (of which ca.

[4][5] Instead, the calculator concept was revised again and the specs further improved (e.g. color touchscreen, even more powerful processor), which eventually led to the release of the HP Prime in 2013.