FOCAL required no operating system and was a complete environment in itself.

FOCAL无需操作系统，其自身就是一个完整的环境。

youdao

This example demonstrates another aspect of SIMH, where your image requires no operating system and is interactive (differing from the earlier batch run on the IBM 1130 system).

此示例演示了SIMH的另一个方面，其中您的图像无需操作系统并是互动的(不同于运行在IBM 1130系统上的早期批处理)。

youdao

No professional operating system gets better grades from users, according to Datapro, another consultancy (see chart).

ECONOMIST: Software

Clearly, no CPU or operating system is going to grab an infected file and execute it.

CNN: Technology - Analysis: Understanding viruses

At its best, the result adds some much needed life to an all-work-and-no-play operating system.

CNN: FAQ: What you need to know about upgrading to Windows 8