部分源程序如下： #include #include #define uchar unsigned char sbit BUSY=P2^6; sbit STB=P2^7; void topin(uchar *p) { while(*p!='\0') { while(BUSY!=0); //查询打印机状态 P0=*p; //输出字符 STB=0; //模拟STB脉冲 p++; } } void main() { uchar idata prn[]="welcome"; //打印 welcom