在我们的这种场景下，针对大型机根本没有外来技术。

In our scenario, there were no foreign technologies at all on the mainframe.

这些游戏的历史可以追溯到串行控制台、大型机和小型机时代。

These games date back to the time of serial consoles, mainframes, and minicomputers.

我们真的能够在PC中模拟大型机操作系统及其所有组件吗？

Can we really emulate a mainframe operating system and all its components in a PC?

请记住，移植大型机应用程序的风险和成本不仅限于所移植的应用程序。

Remember, the risk and cost of porting a mainframe application is not limited just to the ported application.

在大型机被小型机（可让企业简化更多业务流程从而提高效率）赶下王座之时，SAP发展壮大。

SAP came of age when mainframes were dethroned by smaller computer systems that allowed companies to streamline many more of their business processes.