oldp = -1
oldp2 = -1

while ( 1 = 1)
  if (peek("PORT1") <> oldp) then
    oldp = peek("PORT1")
    print "PORT1: ", oldp
  fi

  if (peek("PORT2") <> oldp2) then
    oldp2 = peek("PORT2")
    print "PORT2: ", oldp2
  fi

wend