< I've always wanted to ask this question. How is a microprocessor made? < Can someone here on the list answer this question? Very carefully. Actually that is not a joke as it is a very precise process. The process is generally the same as making any integrated circuit save for microprocessors are more complex. The basic idea is that a piece of polished pure crystaline silicon has areas photographically marked and either etched away or doped (infused) with other chemicals (like boron, arsenic, others) to alter the local properties of the silicon to form transistors where and as needed. Other steps put metalization like printed circuit board traces to interconnect active areas on the chip. Once complete they are tested seperated and mounted in holders. All of this is done on a scale of size that is in the range of 1/100000th of an inch and smaller. So the "very carefully" comment is valid and speaks to the level of accuracy and cleanliness needed. That is a pretty trivial description but a detailed one could fill volumes quickly. Allison