I've seen card readers try to read from both sides of the card in case it's swip... | Hacker News

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ryan-c on Nov 14, 2013 | parent | context | favorite | on: Meet Coin (YC W13), a startup creating a universal...

I've seen card readers try to read from both sides of the card in case it's swiped on the wrong side - you might have some problems with those.

christiangenco on Nov 15, 2013 [–]

For compatibility, penny will offer a special adapter that will decrease interference with some card scanners.

You can purchase this compatibility adapter for $3.95 for 66 feet: http://www.amazon.com/Scotch-Electrical-75-Inch-66-Foot-0085...

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