The Newton aggressively sleeps. It runs like hell when it needs to, then spends the rest of its time consuming as little power as possible. It kind of helps th

The Newton aggressively sleeps. It runs like hell when it needs to, then spends the rest of its time consuming as little power as possible. It kind of helps that the Newt doesn't have any kind of built-in wireless. No radio means no networky stuff that it has to periodically wake up for. The number of threads the thing runs (20-30) also spend most of their time utterly asleep. (Back in the day, a threading, message-passing OS in a small form factor was considered pretty high tech).