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I'm a little partial to this small tablet, the Seeed Studio ReTerminal (seeedstudio.com/reTermi…). It includes both the 40 pin GPIO and their own expansion bus, designed for mating custom hardware packs on the back. Not exactly pocketable, but for sure will fit in a pack as easily as a KX-2. And with a phone GUI option might not matter t…
I'm a little partial to this small tablet, the Seeed Studio ReTerminal (https://www.seeedstudio.com/reTerminal-CM4108032-p-5712.html). It includes both the 40 pin GPIO and their own expansion bus, designed for mating custom hardware packs on the back. Not exactly pocketable, but for sure will fit in a pack as easily as a KX-2. And with a phone GUI option might not matter that it isn't on your belt. Their reference design expansion pack (E10-1) has space for a couple of 18650 cells, PCI and M.2, and includes cutouts for SMA connectors/antennas. And the expansion bus is published and free to use. it will even power over Ethernet
Again, the hardware is here, just need the software to drive it.