RaspberryPi foundation sells all what you need - compatibility guaranteed.
You can get the computer, screen and power supply.
Other components you might need:
1. case for raspberry pi can be ordered from their suppliers.
2. Battery power can come from cellphone USB battery bank.
There may be even cases which would accommodate the battery bank. It all
depends on what works for you.
Just go to raspberrypi.org.
Tomas
On Sun, May 3, 2020, 04:33 Richard Owlett <rowl...@cloud85.net> wrote:
> 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
> OS shall be FOSS {Debian preferred, non-free drivers???}
>
> 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 which don't reference Android &/or smart(sic) phones?
> TIA
>
>
>
>
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