#include <reg51.h>
sbit MYSW=P2^0;				
void main(void)
  {
    unsigned char z;
    unsigned char Mess1[]="Normal Speed";
    unsigned char Mess2[]="High Speed";
    TMOD=0x20;				
    TH1=0xFF;				
    SCON=0x50;   
    TR1=1;					
    if(MYSW==0)
      {
        for(z=0;z<12;z++)
          {
            SBUF=Mess1[z];		
            while(TI==0);		
            TI=0;
          }
      }
    else
      {
        PCON=PCON|0x80;		
        for(z=0;z<10;z++)
          {
            SBUF=Mess2[z];		
            while(TI==0);		
            TI=0;
          }
      }
  }