I've been thinking about what a handheld computer COULD be. My image is heavily influenced by my recollection of Palm Pilot.
My needs include: >2 hours battery life 4" by 7" nominal form factor touch screen input using a stylus display will be entirely character mode (40 chars/line would be OK) OS GUI not required except to say where stylus is all software shall be FOSS {Debian derived much preferred}
I suspect even a Pi Zero should be able to handle most needs. I've not found found user friendly selection guides. A typical problem was not being able to know if a selection of components had mutually compatible I/O (electrical and physical).
I've never used a Pi and need something to give me perspective. I date back to days of CPM-80 on a S100 system. Suggestions? TIA