This book presents the basic concepts used in designing and analyzing digital circuits and introduces digital computer organization and design principles. The first part of the book teaches you the number systems, logic gates, logic families, Boolean algebra, simplification of logic functions, analysis and design of combinational circuits using SSI and MSI circuits. It also explains latches and flip-flops, Types of counters - synchronous and asynchronous, counter design and applications, and shift registers and its applications. The second part of the book teaches you functional units of computer, Von Neumann and Harvard architectures, processor organization, control unit - hardwired control unit and microprogrammed control unit, processor instructions, instruction cycle, instruction formats, instruction pipelining, RISC and CISC architectures, interrupts, interrupt handling, multiprocessor systems, multicore processors, memory and I/O organizations.