False-colour scanning electron micrograph (SEM) of the memory cells forming part of a TM 2716 silicon chip, or integrated circuit. The chip is of the EPROM type: Electrically Programmable Read-Only Memory. EPROM chips are programmed by applying a voltage across selected connecting pins. In this micrograph, the memory cells are the p"-shaped features. They provide 16,386 bits of memory & can be switched electrically so that the chip stores the information programmed into it. In some EPROMs the memory can be erased by shining ultraviolet light through a quartz window in the chip's outer packaging; it can then be reprogrammed. Magnific- ation: x330 at 35mm size. Gold tint. Original is bw print T370/454. Ref: MICROCOSMOS, fig. 8.22, p. 162"