I passed along Megan's suggested COPY command to the company who are trying to copy their one and only tape on a VT103. I have just received the following response. Any further suggestions would be appreciated. Out of curiousity, I asked what the machine was and whether they had any pictures. They have kindly passed along a scan of the original brochure, which I'll put online shortly. The VT103 is controlling a CNC milling machine for cams. It was made by a Swiss company called Macor SA, back in 1983. I'm not surprised they're worried about the longevity of the tape! --quote-- As for the copying of the tape no success as of yet, I tried the following: i) COPY/SYS DDO: DD1: I tried this twice the first time the following messages appeared :- FILES COPIED: ?MON-F-SWAP ERROR I then tried to boot the system using using the new copy and it said: ?BOOT-F-NO BOOT ON VOLUME The second time I tried the message was: PIP-F-DIRECTORY INPUT ERROR DD0: ii) COPY/BOOT RT11FB.SYS DD1: This caused the following: ?DUP-F-OUTPUT ERROR DD1: I don't know if this will mean anything to you but the following messages are what is shown on the screen when the system is booting up, I thought it might shed some light on the situation: RT-11FB V04.00 .SET TT: SCOPE .SET TT: WIDTH=120 .SET USR NOSWAP .RUN ID The last command loads up the program that's all I know, because on the tape there are two programs ID and IDT when we want to swap between them we press CTRL C then the message ?MON-F-SWAP ERROR appears and then we enter RUN ID or RUN IDT One thought I did have, do I need to format or erase the blank tape before copying on to it? --end quote-- - Paul