I have the svc docs for the 7902A, which describe the Amigo protocol in a fair amount of detail. http://bitsavers.org/pdf/hp/disc/07902-90060_7902svc_May79.pdf This was the drive used in the HP300 (Amigo) Was the 9895A a repackaging of the 7902A for the 1000 series? Does the 9895A still use HP's M2FM encoding format? There isn't really a picture of the 7902A in the manual.