Hi, I have recently added an RX02 to my 11/23+ system, and was trying to make an XXDP bootable floppy, but havae had no success. I can write files to the drive, and read them back, but can't boot. The process I used (in UPDAT) was: ZERO DY0: CREATE DY0: then copy all *.sys files, plus UPDAT and HELP to the disk ( I have a TU58 image with these files on that will boot fine, using the TU58 emulator). I tried copying the files with both FILE and PIP, but when I use either the UPDAT BOOT command, or key in a bootstrap, the proceesor halts at address 000016 (I think this indicates a trap on halt). Can anyone tell me what I'm doing wrong.......... Thanks Jim. Please see our website the " Vintage Communication Pages" at WWW.G1JBG.CO.UK