The document provides an introduction to the 8085 microprocessor, including its evolution from earlier Intel microprocessors like the 4004 and key concepts like the stored program concept. It discusses the three major parts of a computer system - the CPU, memory unit, and I/O devices. The 8085 uses a three bus system architecture with an address bus, data bus, and control bus to transfer information. A block diagram shows a typical microprocessor-based computer system.