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There was a demo of a Linux OS that simply boots to vim and that’s the only thing you could do on that machine. It would be perfect for this use case.

• criddell 3y ago
  Linux is pretty heavy compared to something like EPOC that the Psion used. That machine would run 20 hours on a pair of AA batteries. We’ve come a long way since then. Surely a month on a pair of AA batteries should be possible?
  • xwdv 3y ago
    But we have lithium now.
    • criddell 3y ago
      Sure. As long as they are a standard battery that will still be around 25 years from now. In the year 2050 you can probably take your Psion 5 from 1998, insert AA batteries, and start writing.