That sounds like Tex-Comp. They distributed a lot of TI software from Europe and places outside the U.S. as "freeware". So Weiand didn't actually write the editor? (It is more an editor than a compiler, no real "compiling" is done except when actually running the game.) So who wrote the Knight Ironheart adventure? Probably one of the most frustrating adventures I ever played... Even studying the adventure logic didn't help.

Yeah, just reading the instructions for the Adventure Editor was a great learning aid for boolean algebra and logical paths. And what it lacked in memory it made up for in elegance of operations. I'd still be writing adventures using it, except my imagination has far outgrown what the engine is capable of. :)