This afternoon David send me a PDF copy of the HP 64000 Logic Developement System Configuration manual. I've posted it in the same directory with the HP disk drive manual. Joe David Bryan just scanned and sent me a copy of "HP's 5 1/4-Inch Winchester Disc Drive Service Documentation" (HP 09134-90032, August 1983) for the old style HP 9133/9134 and 9135 disk drives. Besides the always useful service information, it includes explainations of which drives can be made to look like 4 1.15Mb floppy drives for use on the HP-85 and other small systems that don't normally use the HP hard drives. I've posted it at "http://www.classiccmp.org/hp/HP%20Docs/". Thanks David! Joe