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Muxcard: a portable computer the size and thickness of a credit card

Rob Beschizza
Jun 01, 2026
∙ Paid

The prototype Muxcard. Image: krauseler

Muxcard is a working, programmable computer built into the footprint and roughly the thickness of a credit card. Its developer, who goes by krauseler on GitHub, published the hardware and firmware specification as open source and has a working prototype in hand.

“After months of iteration, sleepless nights, frustrat…

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