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.<p>It kind of helps that the Newt doesn&#x27;t have any kind of built-in wireless. No radio means no networky stuff that it has to periodically wake up for.<p>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).