Beyond that, AFAIK it didn't have pipes, which was a real limitation for creating, well, pipelines to stream process data far larger than available RAM.
I miss the days, but not the OS.
Coincidentally, a few minutes later, the 780 threw a fatal memory error and shut down. My 17 year old self assumed he had broken the VAX, returning to work (I was an intern) on Monday morning expecting to be fired.
Writing the trojan, which had to correctly implement all the terminal timeouts, responses to ctl-y and so on, was quite a challenge. Required me to understand $QIO, by reading the microfiche copy of the terminal handler BLISS-32 source code.
> In OpenVMS Version 7.1, the DCL PIPE command was introduced.
Ask me how I really know OpenVMS v6 doesn't have pipes.
[1] http://h30266.www3.hpe.com/odl/axpos/opsys/vmsos84/6489/6489...