The PC's DOS operating system was designed to address no more than one megabyte (1MB) of memory. Today, an entry-level computer has 4,000 times as much. THIS DEFINITION IS FOR PERSONAL USE ONLY.

Although additional system modules may be loaded as needed, the main part, known as the "kernel" resides in memory ... to" the operating system for all user interface and file management operations.

This excerpt offers a introduction and review of embedded operating systems ... of standards that define a standard OS interface and environment. POSIX provides OS-related standard APIs and ...