This article describes how to use virtualization technologies from Unisys, a Microsoft partner, with an existing Unisys ClearPath Forward (CPF) Dorado enterprise server. With this approach, you can accelerate your move into Azure and eliminate the need to rewrite the application code or redesign the database architecture. Existing code is maintained in its original form. The application screens, user interactions, and data structures behind the scenes are unchanged, which eliminates the need to retrain your users.

https://learn.microsoft.com/en-us/azure/architecture/mainframe/virtualization-of-unisys-clearpath-forward-os-2200-enterprise-server-on-azure