The board that is installed in the Taz 6 is a RAMBo 1.3L that we source from Ultimachine so there shouldn’t be any differences between the RAMBo 1.3L from them and the RAMBo 1.3L that you would have gotten from us. Could you post some photos of the missing port? Once you flash the firmware for your printer setup onto the RAMBo it should be fully functional, but the fact that there may be a missing connector makes me curious if maybe the board sustained shipping damage so it would probably be safer to post the photos of the new board before flashing it so we can look it over for potential damage.