muddle

Here's a fixed-up version of this classic manual (correcting the scanning errors from p. 71 onward found in the original): https://github.com/PDP-10/muddle/blob/master/doc/MDL_Program... Other significant MDL manuals (including 2 similarly fixed-up versions) can be found here: https://github.com/PDP-10/muddle/tree/master/doc

This GitHub user account has a wealth of other PDP-10 stuff: https://github.com/PDP-10 The Panda TOPS-20 distribution: https://github.com/PDP-10/panda TENEX, or TEN EXtended, the OS BBN made for the PDP-10s they extended to have paging virtual memory: https://github.com/PDP-10/tenex Muddle, the language Zork was originally written in: https://github.com/PDP-10/muddle Two different Zork codebases: https://github.com/PDP-10/zork-1 https://github.com/PDP-10/zork

Interesting. I did find an implementation of backquoting in MDL, kind of: https://github.com/PDP-10/muddle/blob/master/mim/development... It doesn't run on any available MDL implementation, because it's actually for MIM, an even more obscure and undocumented extension of MDL. ZILF implements some parts of MIM, but doesn't implement READ-TABLEs at all, and the format of the table implied by that code is different from what's documented for MDL.