The 8086 microprocessor is available with clock frequency of 5, 8 and 10 megahertz. It is an Intel microprocessor and also a 16 bit microprocessor.

The arithmetic instructions are grouped together in Appendix A. Since four addressing modes are possible, the ADD A instruction can be written in different ways:

When instructions operate on data, the question arises: "Where are the data?" The answer to this question lies in the 8051's "addressing modes."

A 555 timer IC is used a a-stable multivibrator as shown in the given figure (A). The threshold input is now connected to the trigger input (Pin 2), the resister R1, R2 and capacitor C1 for timing network which set the frequency of the oscillator.