As a reminder, the zBitx has a functional, but limited display and no provision for an on-board keyboard (beyond an impossibly small on-screen keyboard, I suspect), the same as the sBitx, but the sBitx has a much larger (physically and pixel-wise) than the zBitx.
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it is very likely either radio will, at a minimum, require/benefit from a USB or Bluetooth keyboard, if not a companion device (tablet, smartphone or laptop).
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Ken