Absolutely, in both RX01 and RX02 modes. If you have the DSD-440 hooked to your PDP-11, you can just boot the utility floppy that came with the DSD-440 and it gives a menu letting you select from several different diagnostics and format utilities. You don't even need a computer hooked to the drive to do it - you just set the hyperdiagnostic DIPswitch pack on the in-box controller to format the floppies, and let it rip. Never, ever, lose the hyperdiagnostics section of your DSD440 manual! Every DSD440 box I have (gees, there must be 9 or 10 now) has a Xerox of the DSD440 hyperdiagonstics pocket ref taped to the top cover :-). It's a quad-size card marked "DSD 2131". There's a complete schematic of the interface on page A-20 of your DSD 440 User Guide. Looks to be maybe $15 in TTL chips. -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927