电脑系统从早期开发的产品开始,就配有用于硬件系统测试的自诊断程序(又简称“自检程序”)。电脑系统从加电开机到显示器显示DOS揭示符和光标的过程中,首先要通过固化在ROM中的ROM BIOS硬件系统自诊断。当诊断正确后,再进行系统配置、输入输出设备初始化,然后引导操作系统,完成将MS-DOS系统的三个文件(两个隐含文件IO.SYS和MSDOS.SYS及命令处理程序COMMAND.COM)装入系统内存,从而完成启动过程。最后给出DOS提示符和光标,等待 Computer systems Beginning with earlier developed products, self-diagnostic programs (also referred to as “self-test programs”) for hardware system testing are available. Computer system boot from power-on to the display DOS reveal symbol and the cursor process, first of all through ROM solidified ROM BIOS hardware system self-diagnosis. When the diagnosis is correct, then the system configuration, input and output device initialization, and then boot the operating system to complete the MS-DOS system, three files (two hidden files IO.SYS and MSDOS.SYS and command handler COMMAND.COM ) Into the system memory to complete the boot process. Finally given the DOS prompt and cursor, waiting