5 ms·
The early ones had a capacitor that held enough charge to allow you to change the batteries without losing state.
by zelos 12y ago
The early ones had a capacitor that held enough charge to allow you to change the batteries without losing state.
- dspillett 12y agoThe Psion hand-helds (at least the 3 and 5 eries) did this too. They were powered from a pair of AA batteries and no state was lost while changing them, though IIRC it was a small button cell that gave power to keep the memory refresh going while there was no power from the AAs or the external power adaptor, not a capacitor.
- jon-wood 12y agoYeah, and that button cell didn't last as long as you might think - I remember many an occasion when I'd let mine run flat, and then leave it just a little bit too long before charging it back up again.