In some analog color CRT displays, starting in 1956, the brightness control signal ( luminance ) is fed to the cathode connections of the electron guns, and the color difference signals ( chrominance signals ) are fed to the control grids connections.
22.
If you use it a " normal " amount of time, which according to Palm is about 40 minutes per day, and you leave the brightness control at its default position, you'll be able to use the IIIc about two weeks on one charge.
