Concentrating on the MS-DOS operating system and using short applications, this complete and fully updated study of assembly language for the IBM-PC helps students learn the basics of operating systems and architecture in the context of a microprocessor, and teaches them how to approach programming problems with a machine-level mindset. Based on the Intel 80x86 processor family, it simplifies and demystifies concepts that must be understood before students go on to study computer architecture or computer operating systems in more advanced courses. The text provides hundreds of short examples that show how assembly language may be applied to useful problems.