In the Mainframe Computers ecosystem, value flows through the creation and capture of innovative technologies, products, and services. Control points, such as technology providers and system integrators, influence the adoption of mainframe computers by shaping their design, functionality, and compatibility. Dependency risks, including input constraints, standards, and approvals, can impact the ecosystem's efficiency and innovation. Furthermore, switching costs, partnerships, and interoperability requirements can affect the relationships between participants, leading to varying degrees of collaboration and competition. A thorough value chain analysis of the Mainframe Computers ecosystem is necessary to understand these dynamics and identify opportunities for growth and improvement.