All have retained essential backward compatibility with the original S/360 architecture and instruction set.

It retained backward compatibility with the CG's graphics language.

Featuring greatly enlarged locomotives and rolling stock, while retaining compatibility with standard wooden track.

As additional functionality is required, the library is extended (while retaining backward compatibility).

Whichever design wins, it is certain that personal computers will continue to shrink, while retaining almost full compatibility with desktop and larger systems.

New fabrication technology has largely overcome the speed problems, while retaining backward compatibility with most circuit designs.

The "compatible color" standard retained full backward compatibility with existing black-and-white television sets.

The intention was to reduce power consumption by 50% or more, while retaining full compatibility with existing equipment.

The wider registers retain compatibility with their smaller predecessors.

Each of these architectures has retained compatibility with most of the features of its predecessor.