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The ISA describes the (1) memory model, (2) instruction format, types and modes, and (3) operand registers, types, and data addressing. Instruction typesA computer must have instructions capable of performing four types of operations. ◇ Data transfers between the memory and the processor registers. Machine instruction is defined as sequence of bits in binary which directs the CPU to perform the specific operation. Types Of Programming Languages. Types of machine instruction are commands or a program written in the machine code of a machine (computer) that it recognizes and executes. Machine instructions – four main steps There are four main steps in the machine instruction cycle: – Fetch: the processor fetches the instruction from the