ingenuity of original square card reader underrated imo.

the reader tunneled the card number through the mic input. It's recovered  in software by analyzing the waveform.

It was brilliant engineering, a major unlock for commerce and packaged beautifully.

hardware breakdown:

ingenuity of original square card reader underrated imo.

the reader tunneled the card number through the mic input. It's recovered  in software by analyzing the waveform.

It was brilliant engineering, a major unlock for commerce and packaged beautifully.

hardware breakdown: https://tinyurl.com/jdm8ct2a

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