Which BASIC pocket computers make the best calculators?

[John Keith]

The main issue that limits the usefulness of the Raspberry Pi for portable devices is power management (or lack thereof). The Pi lacks a low-power sleep mode and must be shut down completely before power is disconnected. What I would like to see is a Raspberry Pi variant made with portable use in mind. It should be possible, cell phones use similar ARM-based processors, but the Linux system used by Raspberry Pi seems to be rather primitive where power management is concerned.