I have an international debit card by VISA issued in India. The card has magnetic stripe. Will the ATM card be valid in the USA or do i need a chip based EMV card?
The machine knows if the card has a chip, and will prompt you to place your card in the chip reader. If there is no chip, it's just like normal.
Although it may be in the news a lot, the chip based cards are rarely enforced from places of business that I've seen. It seems those companies who were affected by large hacks in the previous years (Target comes to mind) are the ones who've made the switch. Many places don't even have the ability to do chip based payment. Think of all the local business who use Square or any number of iPad POS systems. And I imagine retailers are reluctant to pay the cost associated with replacing their perfectly functioning technology.