KLH10
From Computer History Wiki
KLH10 is a PDP-10 emulator written by Ken Harrenstein. Unlike SIMH, which emulates the KS10 (microprocessor-based) processor model, KLH10 emulates the slightly earlier KL10 processor, allowing large memory systems to run. It was originally considered for a NetBSD port.
The project's homepage is: http://klh10.trailing-edge.com/