This book provides the necessary know-how for programming modern personal computers and peripheral devices at the machine level, enabling the creation of professional applications. In addition to the software interface for all PC hardware components, it also thoroughly explains current topics such as speech output and graphics processing. The programs presented are extensively documented at the module level and illustrated with flowcharts. The book places particular emphasis on the object-oriented realization of applications, frequently introducing the reader to the OOP variants of traditional C programs. As a special highlight, the book includes a complete PC game in graphic mode, with its source code fully disclosed. Many of the routines presented in the book are utilized within this application.