hello.c

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#include <stdio.h>                /* standard I/O .h-file              */
#include <reg167.h>               /* special function register 80C167  */

/****************/
/* main program */
/****************/
void main (void)  {               /* execution starts here               */
                                  /* initialize the serial interface     */
#ifndef MCB167          /* do not initialize if you use Monitor-166      */  
  P3  |= 0x0400;        /* SET PORT 3.10 OUTPUT LATCH (TXD)              */
  DP3 |= 0x0400;        /* SET PORT 3.10 DIRECTION CONTROL (TXD OUTPUT)  */
  DP3 &= 0xF7FF;        /* RESET PORT 3.11 DIRECTION CONTROL (RXD INPUT) */
  S0TIC = 0x80;         /* SET TRANSMIT INTERRUPT FLAG                   */
  S0RIC = 0x00;         /* DELETE RECEIVE INTERRUPT FLAG                 */
  S0BG  = 0x40;         /* SET BAUDRATE TO 9600 BAUD                     */
  S0CON = 0x8011;       /* SET SERIAL MODE                               */
#endif

  printf ("Hello World\n");  /* the 'printf' function call               */
  while (1) {                /* An embedded program does not stop and    */
    ;  /* ... */             /* never returns.  We've used an endless    */
  }                          /* loop.  You may wish to put in your own   */
}                            /* code were we've printed the dots (...).  */