SunOS 4.1.4 died of manufacturer induced termination of support and maintenance. With the passing of SunOS, the compiler and supporting software development tools that were used to build the kernel became separate saleable products instead of operating system components, since the SVR4 kernel supported dynamically loadable modules. SunOS 4.1.4 provided a robust and stable operating system for Sun workstation and server products for nearly a decade. With the passing of SunOS 4.1.4, the architectural legacy of Sun BSD systems also fades into history, replaced by SVR4 and Solaris 2.x and subsequent System V versions of Solaris. (“End of Service Life Status for Solaris Operating System,” 2010)
