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Joined: Aug 2005
Look in the manuals. What is the name of the function that returns the Device ID? Is it DEVID$()? If so, type "DEVID$(1)" to get the device ID of the HP-IL device at address 1. That should be usable as the thing to the right of ':' in the mass storage identifier. So if DEVID$(1) returned "W00T", you could do COPY 'MYFILE' TO 'MYFILE:W00T'.
If it isn't DEVID$, try whatever the actual function for getting the device ID is. I don't have a 75 in shape to be powered up quickly, and you can look through the manual as quickly as I can. If that doesn't do it, try reading the manual some more. The ability to copy files to and from mass storage doesn't come from the I/O ROM; it's in the BASIC operating system. So the owver's manual will have instructions about how to do file copies. I'd look there instead of in the I/O ROM manual.
Good luck!
Howard