8085 microprocessor was initially designed by Intel in 1977 using NMOS technology. Internal Architecture of 8085 and 8086 microprocessors So, as it can be seen in this diagram, there are various functional units in its architecture. Let’s look at their functionality one by one: ALU( Arithmetic and Logical Unit): It includes; the accumulator, the temporary register, arithmetic circuits, and the five flags. It performs arithmetical and logical operations. Accumulator: It’s an