Amusingly, the Soviets managed to do what DEC failed to do -- make microcomputers based on the PDP/11. They had cloned the PDP-11 on a chip and used it as the basis of a microcomputer line!
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.
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.