说明：  本代码使用汇编语言实现8位数字抢答器，配合代码备注所描述的硬件外围电路，可实现抢答器相关模块和功能
(This code uses assembly language to achieve an 8-bit digital Responder, with the code for the hardware described in Note peripheral circuits can be realized Responder-related modules and functions)