//Sending letter "A" to HyperTerminal (or TeraTerminal) via Serial 1 (2nd COM port next slide Sw) on MDE 8051 Trainer
//Tested by M. Mazidi 
//Modified from Example 10-20 in "The 8051 Microcontroller" textbook by Mazidis & McKinlay 
//Download the program by putting the slide SW on PROG 
//After the download is completed: 
//a) disconnect the power, 
//b) disconnect the serial cable from Serial 0 DB-9 and connect it to serial 1 DB-9
//c) Make sure to put a jumper on S2 (next to Power LED) to connect the TXD  
//d) Reconnect the power 
//put the slide SW on RUN and Reset the board and you will see letter 'A' will appear on screen
//Notice the Serial 0 COM port is the one used to download the program to MDE 8051 Trainer
//and Serial 1 (2nd cOM port used in this example) is next to the slide SW for PROG/RUN
#include <reg51.h>
sfr SBUF1=0xC1;
sfr SCON1=0xC0;
sbit TI1=0xC1;
void main(void)
  {
    TMOD=0x20;		  
    TH1=0xFD;		//notice the baud rate is 9600		  
    SCON1=0x50;		  
    TR1=1;			  
    while(1)
      {
        SBUF1='A'; 	  
        while(TI1==0); 
        TI1=0;
      }
  }