This document outlines the units and topics covered in a Digital Systems course, including number systems, Boolean algebra, logic gates, combinational logic circuits, sequential logic, memories, analog-to-digital and digital-to-analog converters, multivibrators, logic families, digital communication basics, and a list of experiments. Unit 1 covers number systems, Boolean logic, and logic simplification techniques. Unit 2 focuses on combinational logic circuits. Unit 3 addresses sequential logic elements and memories. Unit 4 introduces signal conversion circuits and multivibrators. Unit 5 provides an introduction to digital communication concepts. The document also lists several reference books and experiments related to the course content.