As one who is still selling
(and repairing, and upgrading, and using...
) HP 200LX's I do understand the sentiment too well.
Some companies like HP and PSION made systems that had one perfect aspect: If the power ran out, you could pop into the first gas station or drug store, buy two AA's for the next month of running.
It is not nostalgia, just holding on to near-perfect hardware.
Michel