It was probably a VAX 11/780. If you were cheap you purchased an 11/750. The 780 had a PDP-8 for a console processor. https://news.microsoft.com/features/the-engineers-engineer-c...
The 750 was later technology, IIRC MOSFET. It also lacked the 780’s “compatibility mode”, which allowed VMS to run 16 bit RSX-11 executables by implementing the PDP-11 instruction set in addition to the 32 bit VAX one, and could boot without a console processor. If you didn’t need all the users on one machine, the 750 was cheaper per user.