My tech roots go back to the trusty slate and stylus. I still use it to label mail that I want to keep. It's definitely portable and doesn't run on batteries.
Our first PC was one from Radio Shack back in the 80's. I think it was called TRS 80 or "trash 80!" Now, I do 99.9 per cent of my computing with my iPhone 6. If I can find a scan stand that will suit my needs, my Mac and Toshiba may become paper weights.