键盘的扫描及译码实验“若不按键盘，则6个8位数码管中的前4个全亮即显示8，剩下2个不亮；当按下0-F键中的任一个时，6个数码管的前4个皆显示8，第5个不亮，第6个显示按下的数字；当按下TRACE、STEP、HERE、EXEC、MON、LAST、NEXT时，6个数码管的前4个各显示8，第5个不亮，第6位相继显示为0、1、2、3、4、5、6。-Keyboard scanning and decoding experiment " Without the keyboard, then 6 8 digital tube in the top four all light is displayed 8, and the remaining two are not bright　When you press 0-F bond in any one time , six digital tube display before 4 are 8, 5 is not lit, press the first 6 shows the number　when you press TRACE, STEP, HERE, EXEC, MON, LAST, NEXT, the six digital tube each of the first four shows 8, 5 is not lit, the first six have been shown as 0,1,2,3,4,5,6.