transistions	var	byte

  input  1
  input	 2
  output 3

  out3 = 0

zeroloop:
  IF in1 = 0 THEN zeroloop

  out3 = 0

  IF in2 = transistions // 2 THEN oneloop

  transistions = (transistions+1) // 4

  IF transistions <> 0 THEN oneloop

  out3 = 1

oneloop:
  IF in1 = 1 THEN oneloop

  goto zeroloop