[Coco] Ferrite rings on CoCo floppy drive cables?

[Jim Cox]

Last night I was working on a CoCo drive and trying to 
change some connectors on a cable, and noticed that the 
cable I was working on had a ferrite ring on it for EMI.

 From what I can recall, none of the other drives I have 
seen had a ferrite ring on the cable.  Any thoughts from 
the guru's on the list?

I ended up replacing the cable with another that did not 
have a ferrite ring on it, and noticed that after turning 
on the Monitor, then the CoCo, that when I turned on the 
Drive, there was a momentary glitch on the screen.  I 
don't recall that this happened before, but my power up 
sequence was a little different due to a MPI being in the 
system (Power up MPI, Drive, Monitor, then CoCo)

It's been a long time since I worked with this vintage of 
equipment, so maybe this is normal?

Jim