My 9133, which originated this thread, is a 9133D, with a single
controllerboard, one DS floppy and a ST419 15MB MFM disk, a disk which
is clearly older than the ST225 ( it is similar in construction to a
ST506 or ST412)
First problem with the drive turned out to be severe head stiction. It
is spinning now, so I might yet be able to coerce some life out of it.
Jos