通过利用汇编语言中的循环，堆栈，延时等技巧以及子程序，BIOS和DOS的调用，由用户选择，实现在屏幕中央输出A到Z或者显示黑客帝国式的屏保。-Through the use of the cycle, stack, and delay in the assembly language skills and the subroutine, the BIOS and DOS calls, selected by the user to achieve in the center of the screen output A to Z, or display on the Matrix-style screensaver.