https://hackaday.com/2014/06/08/the-in-circuit-sd-card-switc...
more links: https://hackaday.io/project/19783-sd-card-emulation
https://hackaday.com/2014/06/08/the-in-circuit-sd-card-switc...
more links: https://hackaday.io/project/19783-sd-card-emulation