For sophomore/junior-level courses in Assembly Language, Microprocessor Technology, and PC Instrumentation, with a C Programming course as a prerequisite. This book is appropriate for courses found in computer or electrical engineering technology, computer tech or computer science. Starting with the basics and then carefully and gradually progressing to more advanced levels, this text helps students develop a solid understanding of how the PC operating system works. It provides a practical balance between hardware and software (with a slightly stronger focus on assembly language) and emphasizes programming as a means of teaching PC architecture. A Windows-based program -Easy4 - is used to simulate a simple microprocessor.