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中断功能是微型计算机的一个重要功能。但不少 TRS-80的用户会感到,该系统的中断很有局限性:在一个基本系统中,除中断方式1外,不能使用任何中断方式。这里介绍一些简单的改进方法,使您的 TRS-80能恢复所有的中断方式。Z—80的处理器芯片有两个中断输入端,叫非屏蔽中断(NMI)和可屏蔽中断(INT)。在 TRS—80中,复位按键是接向 NMI,当你按这个键时,处理器从0066H 地址重新启动,并在显示屏上以“READY”来响应,达到复位的目的。
Interrupt function is an important function of the microcomputer. However, many users of TRS-80 will feel that the system interrupt is very limited: in a basic system, except interrupt mode 1, you can not use any interrupt mode. Here are some simple ways to improve your TRS-80 to recover all interrupts. The Z-80’s processor chip has two interrupt inputs called Non-Maskable Interrupt (NMI) and Maskable Interrupt (INT). In the TRS-80, the reset button is connected to the NMI. When you press this button, the processor restarts from the 0066H address and responds with “READY” on the display to reset.