STC / A. STERNBERG / SCIENCE PHOTO LIBRARY. STC / A. STERNBERG / SCIENCE PHOTO LIBRARY.
Light micrograph of the surface of a STL80 micro- processor, also known as an Integrated Injection Logic Design Validation Module. Microprocessors are the central processing units of a computer, packed into a single silicon chip. As the picture shows, they consist of a great variety of devices. Prominent are the square pads around the edges of the chip. Some are test pads; others will have connecting wires welded to them to provide the chip's links with the outside world. The STL80 is manufactured by STC. Reference: MICROCOSMOS, figure 8.21, page 161.
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