After replacing the blown cap on the floppy power supply in my Model 4, it works great! It has a pair of 40-track DS/DD drives in the lower bay, and the upper bay is empty. (As an aside, and I don’t *think* this is relevant, the previous owner had passed a cable from the floppy connector on the bottom of the case back up inside the case to reach the upper drive bay, but it is not connected.) I connected my two external Mini Disks (26-1164 and 26-1164A) and while they seem like they are working, once connected I can’t read them *or* the internal drive 1. Disconnect them and drive 1 works perfectly. Also seems like the drive on the end of the chain (which should be drive 3 I believe?) is spinning when I access drive 0. Is this simply a cabling issue? It’s been a very long time since I used a TRS-80, and even then it was a Model I - I never had a Model 4. What am I missing? Are there jumpers that need to be set inside the drives perhaps? Any help would be most appreciated! - Bob Shuster