See

https://en.wikipedia.org/wiki/DEC_J-11

which was used to build this

https://en.wikipedia.org/wiki/DEC_Professional

DEC had a 1-chip PDP-11 but a 1-chip PDP-11 wasn't competitive with the better chips coming out around 1982. That DEC Professional was not such a great machine and the software support for it was worse. You couldn't run software from the minicomputer and even if you could it wasn't suitable for the needs of end users on a single-user system who were asking to open bigger spreadsheets and such.