Hello, People have been earching for PDP-10 MDL for a long time. Finally, we found source code for TOPS-20 including slightly bit-rotted ITS support. It has now been fixed and is up and running in ITS. Twenex people are welcome to give it a go too. This is published with permission from Chris Reeve and Tim Anderson: http://github.com/PDP-10/muddle Next is, of course, trying to run Zork. How to do that is an entire research project of its own. Best regards, Lars Brinkhoff