本文探讨了操作系统的发展历程，从早期简单的系统调用集合到成为连接硬件平台与应用程序的重要桥梁。随着模块化软件技术的进步，操作系统逐渐成熟并帮助更多开发者加入软件开发行列。文章还特别提到了嵌入式系统的特性，指出其并不一定需要图形用户界面。
Osophobia prevailed among programmers. In the early computer system there is not
the concept of operation system. With developing of module technique of software,
operation system born the earth. At sometime, early operation system might just be
a set of system calls or functions. No matter what a operation system became a hardware
platform. Application programmers can focus their mind on developing application
logics regardless hardware's detail.
In other words, operation system help more and more people join into the group of
developing. At once, application programmers begin to ignore of the technique of hardware
until embeded system coming back.
In my eye, what underware is to human body, that operation system is to hardware.
When it comes to operation system, most people can think Windows, MacOS, Linux, FreeBSD,
and so forth, at once. They all are hugh operation system. A embeded operation system can
be so small or tiny. For example, GUI is not necessory for a embeded system.
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