Falsecolour scanning electron micrograph of a TM 2716 integrated circuit, showing a corner of the device with surrounding connecting pin leads. This chip is of the EPROM type Eraseable, Programmable, Read Only Memory. EPROM chips are programmed by applying a voltage across selected connecting pins. Some such devices may then be subsequently reprogrammed other types, PROMs, may not. Magnification: X 30 at 6x4. 5cm size. The TM 2716 EPROM chip is of the NMOS type (n type