CompuPro floppy controller differences

On 9/19/2006 at 12:09 AM David Griffith wrote: I have one of those--and also an 842 that says "230v 50Hz". Physically, the motors do differ in appearance, but the main difference is the size of the pulley on the motor shaft. Most of my 8" drives use an AC spindle motor. Very reliable. Early 8" drives were all over the place as far as electronics was concerned. Some contain on-board data separator circuits, some require 3-phase stepper control signals, radial select, etc. The early Japanese drives were particularly odd. I think it's remarkable that just about every old Shugard SA-800/801 drive I've ever run across was still in fine operating shape. Very few old Calcomp drives that I've seen are--the positioner motor windings are usually shorted or open. Cheers, Chuck