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

building /automod (channel bots), /glass (no code frames) • uncurated.xyz
• prev @manifoldxyz, twilio

dude 100% agree, i remember noticing they were in the headphone jack years ago but no idea how they pulled that off

It looked fully integrated too. Like a first party product. So smart.