Most business cards are not technically capable, thus the given page will document only “custom”, “unique”, or “one-off” business cards that are custom tailored to have a level of technical capability. With this, one cannot determine any level of “common” OSes or CPU architectures.

All this is accomplished on a very small 8MB flash chip

An interesting creation made for $2.88, complete with some interesting little programs that are more than mere novelties. Great proof of concept for extremely cheap Linux programming.

https://www.thirtythreeforty.net/posts/2019/12/my-business-card-runs-linux/

https://www.thirtythreeforty.net/posts/2019/12/designing-my-linux-business-card/