On other systems than those, all bets are off; I wouldn't be surprised if the slash was a valid part of filenames on something "weird" like VMS.
Nope. VMS is very strict unless things changed in ODS-5 (I haven't worked with V7). ODS-2 only allows upper case alpha, numeric, dollar sign, underscore and hyphen. Slashes in either direction are definitely out. Filenames can have a 39 character name and a 39 character type separated by a period. Older versions of VMS only allowed 9.3 filenames.
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