While searching for other info I was reminded about Raspberry Pi.
Problem is that https://www.raspberrypi.org/ over does glitz.
I need a text based matrix of cards vs features.
[Pointer either to appropriate page of or a U.S. vendor would be fine]
All relevant specs seem to be available as PDF. Just need to know which
one I want.

My proposed system would be composed of:
   Least power hungry board with headers and one USB port installed.
   One touchscreen display.
   One battery.
   One case to hold it all.

Any pointers?
TIA

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