Thanks for the link! I didn't know about the XLISP controversy.

My interpreter doesn't aim for full compatibility - just enough to run the schematic generation workflow from 1991. The core is: defun, setq, car/cdr, recursion, and the (command ...) interface to draw entities.

The interesting part was how templates could trigger other templates - inserting a contactor (Schütz) would automatically generate its coil in the control circuit. Code writing code, classic LISP.