Development of executive routines, both hardware and software

Much has been written about Executive Routines (or Operating Systems) especially in the light of the present vogue for time-sharing and multi-processors. This present tutorial is an attempt to show the engineer what functions are contained in these executives. It starts with the most rudimentary form of executive and builds up to the most complex one. At all stages the executive system described is the most complex one for the biggest computer system. Smaller systems would leave out some of the functions.