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APPLE微计算机有几十种外设卡可供选用,对于一般的应用项目可以直接买到合适的外设卡,这样用户只需编制控制程序,大大地减少了系统开发的工作量。但是通常外设卡的控制程序用的是BASIC(APPLESOFT)语言,它的执行速度较慢,对于工作速度要求较高的项目就不太合适。其实在APPLE CP/M下用Z80汇编语言也完全可以控制这些外设卡。本文介绍用Z 80汇编程序控制APPLE外设卡的方法。
APPLE microcomputer has dozens of peripheral cards to choose from, for general applications can buy a suitable peripheral card, so that users only need to prepare control procedures, greatly reducing the workload of system development. But usually peripheral card control program using the BASIC (APPLESOFT) language, it’s slower to perform, for the work of demanding items is not appropriate. In fact, under the APPLE CP / M Z80 assembly language can also control these peripheral cards. This article describes how to use the Z 80 assembler to control the APPLE peripheral card.