This document discusses the history and development of personal computers (PCs). It notes that the first PC was created by MITS in 1975. Early PCs used 16-bit and 32-bit processors. Over time, PC processing speeds and capabilities have increased dramatically due to advances in computer technology. The document explains how benchmarking is used to measure a computer's processing speed and compares the performance of new versus old PCs. It describes how instructions are processed by the central processing unit (CPU) and stored in memory.