a thought just hit me as to a typical failure that I have seen in floppy drive controllers. Look at the output drivers on the controller and see what the signals look like. These chips are typically open collector buffers of some kind (7438, 7406, 7407, and peripheral chips 7549x series). I have seen these chips have output problems and that could certainly create problems. best regards, Steve Thatcher -----Original Message----- From: "Dwight K. Elvey" <dwight.elvey(a)amd.com> Sent: Jun 28, 2004 12:33 PM To: cctalk(a)classiccmp.org Subject: Re: Floppy drive oddity? (TEC FB-503) Hi One other thought, check that the head positioning system isn't sticking. I also doubt that both drives have had some electronic failure. Dwight