A few years ago, [Frans-Willem] bought a few RGB LED panels. Ten 32×16 panels ... but that didn’t have enough memory for 24-bit color. The microcontroller du jour – a TI Stellaris – couldn ...

USB drives and optical discs are also storage. Memory is made up of "random access memory" (RAM) chips, which are upgradable by the user in a desktop computer but not in a phone or tablet.