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Table of Contents  Instruction Codes  Registers  Buses  Design of Computer Instruction  Timing and Control  Instruction Cycle  Memory Reference Instruction  Input Output Interrupt  Design of Basic Computer  Accumulator Logic   
Instruction codes  What is program-  Is the set of Instruction that specifies the operation  What is computer Instruction-  Is a binary code that specifies a sequence of micro operation for the computer.  So an Instruction code is the group of bits that instructs a computer to perform a specific operation     
Continued..  Instruction code is divided in to parts:  1st Operation Part-  Add/Subtraction/Multiply/shift  No of bits in the operation part depends on the total number of operations available in the computer.  2^3=8  2^4=16  2^6=64   The operation code must consist of n bits for 2^n operations