hSetBuffering stdin NoBuffering doesn't work on Windows

The following program repeats inputted characters until the escape key is pressed.

import IO
import Monad
import Char

main :: IO ()
main = do hSetBuffering stdin NoBuffering
          inputLoop
          
inputLoop :: IO ()
inputLoop = do i <- getContents
               mapM_ putChar $ takeWhile ((/= 27) . ord) i

Because of the hSetBuffering stdin NoBuffering line it should not be necessary to press the enter key between keystrokes. This program works correctly in WinHugs (sep 2006 version). However, GHC 6.8.2 does not repeat the characters until the enter key is pressed. The problem was reproduced with all GHC executables (ghci, ghc, runghc, runhaskell), using both cmd.exe and command.com on Windows XP Professional.