just out of curiosity
for instance we use a palm-pilot in the store I work in for ordering merchandice and inventory.
when the battery runs low we of course change the batteries but the thing that has always interested me is that you don't lose the info while changing the batteries( although you only have a certain amount of time in which to do so). since the power source is OFF.
now I've just started course Electro-Mechanical Tech. in which they have talked about capacitors resistors diodes etc.
so I was just wondering is this how it is possible, that they use capacitors,with resistors and diodes in there as well, it seems logical enough!