Well I have my 9134A connected to an HP-87 and when the system boots it recognizes the hard disk automatically, so that you can just type a CAT commend and see the directory listing. One question, I assume that you have set the two address switches on the back to *different* addresses (e.g. HP-IB addr 0 for the hard disk and addr 1 for the floppy). So if you try to do a CAT on the floppy address, do you still get a timeout? **vp