//Sending message "YES" to HyperTerminal (or TeraTerminal) via Serial 0 COM port on MDE 8051 Trainer
//Tested by Mazidi 
//This is Examples 10-16 from "The 8051 Microcontroller" textbook by Mazidis & McKinlay 
//Download the program by putting the slide SW on PROG 
//After the download is completed, put the slide SW on RUN and Reset the board and you will see the message "YES" will appear on //screen
//Notice the Serial 0 COM port is the same as the one used to download the program to MDE8051 Trainer
#include <reg51.h>
void SerTx(unsigned char);
void main(void)
  {
    TMOD=0x20;		
    TH1=0xFD;		
    SCON=0x50;   
    TR1=1;			
    while(1)
      {
        SerTx('Y');
        SerTx('E');
        SerTx('S');
      }
  }
void SerTx(unsigned char x)
  {  	
    SBUF=x;		
    while(TI==0);	
    TI=0;
  }