This copied DECtape was then added to by the user, and thus was storage for personal programs and data.

[18][19] Once XVM/RSX was released, DEC facilitated that "a PDP-15 can be field-upgraded to XVM" but it required "the addition of the XM15 memory processor.

"[20] The RSX-11 operating system began as a port of RSX-15 to the PDP-11, although it later diverged significantly in terms of design and functionality.

The homonymic relation between DEC, DEX and deques (used as the primary linkage mechanism in the kernel) appealed to my sense of whimsy.

But in a short time I was asked to submit the choice to the corporate legal department for a trademark search and registration.

So I sat down with pencil and paper, and in a few moments came up with better than a dozen candidate acronyms and names.

I chalked all the candidates on the blackboard and we started going through them one by one, pronouncing each out loud, savoring the sound, trying to get the feel of each one.

Bob sat back in silence as I kept looking at each acronym, seeing how it flowed off my tongue, what impression it gave me, and most importantly, the overall feeling about it.

Well, maybe there's just a chance that the legal department kept copies of the correspondence - after all they are lawyers and they seem to hold on to everything (especially my money).

[12][6] The XVM upgrade to RSX was multi-user, and enabled up to six concurrent teletype-based users.