通过对at89s5 1单片机编程特性的描述，给出了利用PC并行口进行在系统编程的系统设计。
By describing the programming characteristics of AT89S51 LPT, the systematic design for doing in-line system programming with PC LPT was provided.
参照西门子802S数控系统编程规范，对NC程序头、起始部分、程序尾等所涉及的控制语句和变量进行了重新调整和设计；
These correlative control sentences and variables are adjusted and designed renewedly that are for CNC head and start and tail ect, according to programme criterion about 802S.
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