Take a look at the 12992-90001_loaderRomsApr86.pdf doc on Al's site. It has details of the operation of the various HP 1000 loader ROMs, including source code listings. There is a separate ROM, p/n 12992-80007 12992E, which is specifically for booting from the 9885 flexible disk. I'm not sure what interface is used to the 9885 for that loader ROM. ROM p/n 12992-80002 12992B is for MAC 7905/7920 drives, 13175A/B interface. ROM p/n 12992-80004 12992H is for HP-IB 7920H/7925H/9895 drives, 12821A interface. If you remove the memory cards from the front card cage of the 1000E CPU you should be able to see the loader ROMs and if you can read the p/n labels you should be able to reference those back to the loader ROM doc to see exactly what you have. _________________________________________________________________ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail