Ⅰ.机器的设计指标PB250计算机是特殊的数字系统的一部份。它要求能很快地执行操作,同时成本又要最低。能够输入与输出各类编码与各种形式的信息。存贮器的容量能根据需要可大可小。编制程序最简便。这就提出了采用单地址操作,并有完备的指令系统。最后它的结构要紧凑并且便于安装。 I. Machine Design Index The PB250 computer is part of a special digital system. It requires operations to be performed quickly, at the lowest cost. Ability to input and output various types of coding and various forms of information. The capacity of the memory can be different according to need. The easiest to program. This proposed a single address operation, and a complete command system. In the end it is compact and easy to install.