We decided to take a look back at our RP2040 "Bones" boards, and found that we somehow neglected to make one for SD card interfacing. so here it is! with a micro SD socket, we connect all the SPI/SDIO pins so either interface can be used. We still have space for all the classic "Bones" elements: RP2040 with 8 MB Flash, USB C, battery charging, neopixel and Stemma QT I2C port.