A computer the size of a credit card is nothing new. There have been many single-board computers following the familiar ...
Tom's Hardware on MSN
Tiny credit card computer includes eInk screen and is just 1mm thick
Prototype plans are on GitHub where the maker encourages experimentation, modification, and non-commercial use.
XDA Developers on MSN
Someone made a literal credit card-sized ESP32 computer, and so can you
Finding a use-case for it can come later.
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