The OneBus from chipitos.be is based on the NUCLEO-F767ZI card from STMicroelectronics. The OneBus is equipped with IEC, IEEE488 and TCBM connectors as well as a cable network card and a WIFI card.
This cartridge (Paddle) allows you to add a TCBM bus to your C16, C116, PLUS/4. So you can connect the OneBus to the TCBM bus and enjoy faster speed. This cartridge is also compatible with the 1551 drive.
For more information check out the OneBus Introduction page on Chipitos.be.