What is Instruction Set?

·         A computer instruction is made up of an operation code (op-code) followed by either zero, one or two bytes of operands.

·         The op code identifies the type of operation to be performed while the operands identify the source and destination of the data.

·         the operands can be :

- The data value itself

- A cpu register

- A memory location

- A I/O port

·         If the instruction is associated with more than one operand the format is always

Instruction Destination, Source