We have used our ATM cards many times when traveling with
ABD. In each of those countries, the ATMs we used gave us a choice of selecting the English language or the language of that country (even in China). After that choice, we usually see the screen display an input choice for the local currency. We always know the exchange rate before heading to other countries and we take a calculator to make sure we input the right conversion amount when accessing the ATM.
In some of the countries, the ATMs allow you to input USD amounts on the screen and then the ATM does the math and dispenses the local currency.
Current daily exchange rate information can be found everywhere (i.e. hotel, banks, travel offices, newspaper, Internet). You can go on the Internet before your trip and print out a currency conversion table that will give you some comfort to keep from entering a big number in the ATM machines that might wipe out your checking account funds.
Two things I would make sure you check out. Does your bank charge a fee for each time you use an ATM in another country? Our bank allows 2 free ATM uses per month (in other countries) and the charges after that run around $5 per transaction. I would also call your bank before your trip and make sure they have in their computer records that you will be traveling to theses countries. That way, you will not run into any problems with your ATM card getting rejected when trying to use it in other countries. We also call our credit card providers as well to let them know we are traveling in certain countries.
Some of our fellow travelers in our ABD group have had trouble with their ATM cards and credit cards because they did not notify their banks before traveling. The banks are just trying to protect the customer when they don't have records of the customer traveling outside of the US.
Have a great trip and remember your ABD guides are good sources for leading you to the friendly ATM machines.