Real-mode A mode of operation available to all Intel processors which emulates the design of the original 8086 microprocessor. In this mode only a 1 Mb memory space is available. The execution of single-task program code within an application process. Multi-tasking operating systems typically execute numerous threads concurrently. Key Concepts Operating system design follows hardware design.
All operating systems provide the same core-group of functions.
Operating systems are expected to provide a set of services to augment their core-functions. The advanced design of the protected-mode processor is responsible for many of the services we've come to expect from today's operating systems.