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目前市场上出售的单板机或双板机都有6个用户自定义键。在监控程序的键盘扫描程序里,检测到自定义键后,就转到规定的自定义键服务程序入口,一般在这个地址中存放了三字节的转移指令,转向用户的自定义键服务程序。以浙江省计算所出售的双板机为例,其入口地址为2307H。在转入自定义键处理程序时,监控程序没有测试键释放。由此,在用户自定义键处理程序中首先要进行键释放测试,否则用户的自定键服务程序被执行1次以上(一般是2次)。另
Currently available on the market for single-board or double-board machine has 6 user-defined keys. In the monitoring program keyboard scan program, after detecting the custom key, go to the specified custom key service program entry, generally stored in this address a three-byte transfer instructions to the user’s custom key service program . Taking the double board machine sold by Zhejiang Province as an example, its entrance address is 2307H. When transferred to a custom key handler, the monitor does not have the test key released. Therefore, the user-defined key handler should first perform the key release test, otherwise the user’s custom key service program is executed more than once (usually twice). another