On bitsavers.org you can find files belonging to the Solo Operating system by Per Brinch Hansen, including Concurrent Pascal.

With these files and simh you can run the Solo operating system.

In this archive you can find the files required to run Solo on Windows. For other systems, compile simh.

>pdp11

PDP-11 simulator Open SIMH V4.1-0 Current git commit id: 6e9324e0+uncommitted-changes
sim> set cpu 11/45
Disabling XQ
sim> att rk1 solo.dsk
sim> att lpt solo_printer.txt
sim> show cpu
CPU 11/45, FPP, MMU, autoconfiguration enabled, idle disabled
256KB
sim> boot rk1

SYSTEM READY
DO: