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PDP—11(DJS—180)系列计算机是应用广泛,具有代表性的一种小型计算机。该机设有四位条件码,其置位条件较为复杂,不易理解和使用。现有的书籍文章和资料对其置位条件和意义介绍和解释得凌乱、不深透。本文从溢出和进位等基本概念出发,以几个典型指令入手,对该机条件码进行全面深入地剖析,并对转移类指令的转移条件进行分析。这些对学习和使用PDP—11机都有参考价值。
The PDP-11 (DJS-180) series of computers is a small, widely used and representative computer. The machine has four conditions code, the setting conditions are more complex, difficult to understand and use. Existing book articles and information on the set conditions and meaning of introduction and interpretation of messy, not thoroughly. Based on the basic concepts of spillover and carry, this paper starts with a few typical instructions and analyzes the condition codes of the aircraft thoroughly and thoroughly, and analyzes the transfer conditions of the instructions. These are valuable for learning and using the PDP-11.