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TRS—80微型计算机系统(简称TRS—80)是一种结构紧凑、价格较低的普及型机。该机适用于教学、科研工作。如果将TRS-80用于实时控制系统,考虑到控制系统的实时性要求,往往需要尽量提高处理机的吞吐能力。因此,有必要对该机的中断结构作一分析,这对于扩大TRS-80的应用范围具有实用意义。TRS-80是以Z80为CPU 的微型机系统,Z80的可屏蔽中断有三种工作方式:即方式0,方式1和方式2。图1是这三种方式的执行过程的简要说明(详细情况参阅有关Z80的技术资料)。
TRS-80 microcomputer system (referred to as TRS-80) is a compact, low-cost universal machine. This machine is suitable for teaching, research work. If the TRS-80 for real-time control system, taking into account the real-time control system requirements, often need to maximize the handling capacity of the processor. Therefore, it is necessary to make an analysis of the machine’s interrupt structure, which is of great practical significance for expanding the application range of TRS-80. TRS-80 is a microcomputer system with Z80 as CPU. There are three working modes for maskable interrupt of Z80: mode 0, mode 1 and mode 2. Figure 1 is a brief description of the implementation of these three ways (for details, see the technical information on the Z80).