Apout: Resurrecting Ancient Unix

Any source code useless unless you can use & modify it. This includes old Unix source  8-)
Several simulators for old Unix platforms:
simh, Ersatz-11, P11
Drawbacks: simulate disk drives & their layout, kernel-mode instructions.
slow, cannot directly read files on simulated disks

Apout simulates user-mode PDP-11 instructions, & converts syscall requests to native syscalls