// MicroBoard program
// Use writeb() to output an unformatted byte

main()
{
   int   i, cmp;
 
   i = 0x01;                     // bit pattern 00000001
   loop {
      cmp = ~i;	               // complement of i
      writeb(0, cmp, 1000); 
      i <<= 1;                   // NB, the shifted position is filled with 0
      if(i == 0x100) i = 0x01;   // repeat
   }
}