I have a T100MD-888+, MD-EXP4040, and a MD-HMI. The T100 manual shows a 1 amp fuse for the T100MD, but no fuses are shown for the other boards. Should the other boards be fused,? value?, parallel fuses?, or one larger fuse for all? Of course all going to the same power supply, mine happens to be 12 DC.
On the T100MD-888+, the high current ground - all in/output grounds (returns) should go there, to an off the boards ground point (with short proper capacity (amps) wire) with the exception of the TTL & Cmos in/out on the MD-EXP4040 which have their own grounds on the headers.