Wow thanks for all the technical info on how you got it working, I went on a search after seeing this and there isn't a lot of easy info to find. I did check out the instruction list and it seems simple* enough to understand and get started.
One of the things I really struggle with though is going from assembly code to something that will run in an emulator. Would you be prepared to do a tutorial / release the resources you created to go from macro assembler to emulator? Would be great if this system is opened up to more people to develop for.
Searching YouTube looks like one guy actually made pong that the guys with the working PDP-1 in a museum did actually run a few years ago... So clearly it is possible!
*ahahahahha