On Wed, 20 Feb 2013, Marc Holz wrote: I have some info for the 6104 drive here: ftp.informatik.uni-stuttgart.de/pub/cm/basf But funny that you mention the problem with reading double-sided floppies. I have had the same issue with the 6104 drive attached to a PC. Writing was impossible, it resulted in completely unreadable tracks. After a long time I finally found the problem: the terminating resistor pack was not the right one. Instead of providing the usual pullup/pulldown pairs to the individual inputs, it somehow left some inputs unterminated, and tied other inputs together. After building a proper terminator (those DIL 220/330 ohm resistor packs are not easy to find and very expensive) all problems went away. Christian