DOS

代码说明：

DOS - ç ，它的内核也是FreeDOS的内核。并在此基础上进行了一定的修改，使其更加实用。 FreeDOS的是项目设计 提供替代到MS - DOS，PC的DOS的和DR - DOS的自由 。-DOS-C started in 1988 as an experiment in writing device drivers in C for Microsoft s MS-DOS. Both block and character device drivers were written, along with special C data structures to match the MS-DOS request packet. It was then recognized that using the same techniques, an operating system could be written that would take advantage of the C language features and would require much less time to develop than the traditional assembly language techniques. Although UNIX had proven this earlier, it was not tried with a traditional pc operating system. At this time, a minimal operating system using the device drivers written earlier along with a new 8086 interrupt API was developed. It was called XDOS and proved to be a functional operating system. This new operating system was used to develop booting techniques and a C library SDK was dev