Introduction to Number systems: Binary, Octal, Hexadecimal, BCD, Gray code, Excess 3 code - Binary arithmetic: 1’s complements, 2’s complements, and Code conversions -Digital Logic Families: TTL, CMOS, NMOS, ECL- Performance comparison of various logic families- Boolean algebra: Basic Postulates and theorems, switching functions, Canonical forms, Logic gates- Simplification using Kmaps and Implementation using logic gates.

Problem formulation and design of combinational circuits: adder, subtractor, Parallel adder and Subtractor- Carry look ahead adder- BCD adder, Magnitude Comparator, parity checker Encoder , decoder, Multiplexer/ Demultiplexer , code converters, Function realization using gates and multiplexers. Implementation of Combinational circuits using Multiplexers and Demultiplexers- Memory: PROMs and PLAs

General model of sequential circuits: Latch, Flip Flops, Level triggering, Edge triggering, Master slave configuration- Realization of one flip flop using other flip flop- Registers-Counters: Binary counters, Modulo–n counter, Decade, Counters, Ring counter and Johnson counter

Organization of 8085: Architecture, Internal Register Organization and Pin Configuration – Instruction Set of 8085 – addressing modes - instruction and machine cycles with states and timing diagram - 8085 assembly language programming

Address space partitioning – address map – Address decoding – Designing decoder circuit for the given address map -I/O Interfacing- Peripheral ICs*: 8255, 8279 and 8251 A. * Emphasis to be given on architecture with simple applications