I have seen one or two that do, but thats not so say they all dont. Most machines have a lot of pictures of the cards symbols on them, if you know what i mean
If i were you ben do wot i did just change say £50 at a travel agents or even in the airport before you go...... the exchange rate is so good out there although make sure you use the crown exchange ......if you do use any other exchange place make sure you know what rate your getting by confirming it with them as some of them have a habbit of ripping you off.