I finally got around to fixing a Brian Instruments BRIKON model 723 floppy drive tester/analyzer I purchased (broken) some time ago. It was a pretty easy problem in the power supply (two shorted capacitors). It now powers up, lights blink, and I don't know how to use it :-) Inside the unit the EPROM stickers say "P723 Apple Dual Analog 4/29/92", so I assume that means this puppy can test Apple analog drives. Just for fun I tried plugging in an old 5.24 inch IBM-PC drive, and after moving the drive select (DS) jumper on the drive to "1", I can step the head back and forth using buttons on the front of the Brian. Ohh I'm a clever monkey! There's a lot I don't know about floppy drives, and I don't understand most of the info the unit presents on it's front panel or display. What's "Radial Select" mean? Or "Binary Select?" Or "Mux Control," for that matter? What does the following pattern mean when displayed following completion of a test cycle? --. | | | Looks like a seven, but there's an extra segment lit up! BTW, the 723 reported that my old floppy drive failed the test, which is quite possible. I was willing to sacrifice that drive in the interests of my education. :-) I would really like to get my hands on a manual for the unit. My search in Google took me to this web site, where someone way back in 2002 was looking for a BRIKON 723 with the analog/alignment attachment (option R). I don't know if that's the same as the Apple Dual Analog feature my 723 has. There's nothing on the back of my unit that says "option R" has been installed. My unit has one "free" slot inside. I guess that's for an option I don't have. Could anyone out there provide me with a copy of the owner's manual? Of course I'll pay for photocopy charges, etc. Alternately, anyone out there interested in outlining how to use this puppy? Thanks so much, Kenn