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美国HEATHKIT公司的ET-3400是配有外设电源的单板微型计算机,属6800系列。IK×8的ROM固化着本机的系统软件——监控程序。本文是对它的IK字节的监控程序剖析。一、系统概述该系统的I/O设备是一个小型键盘及六个七段发光二极管。显示器内存中FC00～FFFF为监控程序,00C5～00FF为监控程序栈区、缓冲区等占用。监控程序由键盘命令处理程序、专用处理程序、中断服务子程序、监控程序用表和十三个通用子程序几部分组成。
US HEATHKIT’s ET-3400 is equipped with a peripheral power supply veneer microcomputer, which is 6800 series. IK × 8 ROM curing the local system software - monitoring program. This article is an analysis of its IK byte monitor. First, the system overview The system I / O device is a small keyboard and six seven-segment light-emitting diode. Display memory FC00 ~ FFFF for the monitoring process, 00C5 ~ 00FF for the monitoring program stack area, buffer and other occupation. Monitor program by the keyboard command handler, special handler, interrupt service routine, monitor program with the table and thirteen common subroutines several parts.