print.c

不少单片机C代码

 #include <absacc.h>
 #include <reg51.h>
 #define uchar  unsigned char
 #define COM8255 XBYTE[0x007f]
 #define PA8255  XBYTE[0x007c]
 #define PC8255  XBYTE[0x007e]
 
 
 void  toprn(uchar *p)
 { 
   while(*p!='\0') {
     while((0x80&PC8255)!=0); 
     PA8255=*p;
     COM8255=0x00;
     COM8255=0x01;
     p++;
   }
 }

 void main(void)
 { 
   uchar idata prn[]="WELCOME";
   COM8255=0X8e;
   toprn(prn);
 }