jtgi
@jtgi
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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welter
@fun
dude 100% agree, i remember noticing they were in the headphone jack years ago but no idea how they pulled that off
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jtgi
@jtgi
It looked fully integrated too. Like a first party product. So smart.
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