#define LCDDATA *(char*) 0x4200

main() {
  0x0057();               /* clears lcd   (routines burn in EPROM)  */
  0x005a();               /* writes to 1st line routines burn in EPROM */
  lcdwrite("Hello World");
  for(;;);
}

lcdwrite(str)
     char *str;
 
{
  int i, len;
  len = strlen(str);
  for (i=0; i<len; i++)
    LCDDATA = *str++;
}