Replacing drives on classic systems was Wild-hair floppy drive

I am pretty sure I've seen some recent-ish 5.25" drives that have the same pull-ups (not termination, strictly) as the PC-type 3.5" drives. Termination is related to the cable type, and not the drivers!. You should terminate the cable with its characteristic impedance at the far end (from the driver), this was typically a 150 Ohm resistor. It also acted as a pull up for the open-collector TTL drivers. Problem was, users couldn't be relied upon to put a termination resistor pack in the last drive on the cable. So later drives (including most 3.5" ones) just have 1k pull up resistors on all the lines. These are not terminators, they do not remove reflections on the cable. It seems to work OK, but it's a kludge... It probably is OK if you have the drives in the same box as the controller, and thus a fairly short cable. I wouldn't want to use it on a couple of metres of cable, though. When I put the external 3.5" drives on my XT, I desoldered the (surface mount) resistors from the drives and made up a terminator to plug into the end of the cable. It may have worked without doing that, but I don't like risking my data. -tony