Is there a 3B2 that has an RLL controller? I thought that only MFM was supported. How can I determine if my 3B2/400 has an ST-506 or an ESDI HD controller in it? Thanks, Pete -- Pete Holsberg UUCP: {...!rutgers!}princeton!mccc!pjh Mercer College CompuServe: 70240,334 1200 Old Trenton Road GEnie: PJHOLSBERG Trenton, NJ 08690 Voice: 1-609-586-4800