随着小型计算机软件和外部设备的不断丰富,应用领域不断扩大,小型计算机系统的可靠性问题变得越来越突出。不仅要可靠的中央处理机和设备、可靠的软件而且还要有软件和硬件可靠的相互配合;设备和中央处理机之间的可靠联结,互不干扰,对于后二者,就是小型计算机系统接口的可靠性问题。系统中软件和设备越丰富,这个问题就越突出。在计算机使用中往往出现硬件运行检查程序完全正常,但某些系统软件一上去就要出毛病;设备自检正常,一联主机 As small computer software and external devices continue to be enriched, applications continue to expand, the reliability of small computer systems becomes more and more prominent. Not only dependable central processing unit and equipment, reliable software, but also reliable cooperation between software and hardware; reliable connection between equipment and central processing unit without disturbing each other; for the latter two, the small computer system interface Reliability issues. The more software and equipment in the system, the more prominent the problem is. In the use of computer hardware inspection procedures often appear to be completely normal, but some system software will go wrong; the device self-test normal, a host