the info I had is;

Processed by WEIAND ADVENTURE EDITOR (c) M.Weiand Kierberger Str.51a 5040 Brühl
(not sure if its Bruhl or Bruehl)

as well as a version that is
Processed by WEIAND ADVENTURE EDITOR (c) M.Weiand Feldgartenstr.50 D5 K|ln 60

the american version changed it appears to
Processed by Tex-Comp ADVENTURE EDITOR P.O.Box 33084, Granada Hills, CA 91344

a couple of games written in it from Berlin seem to support its german origins ;) plus two different german copyright addresses..

As for knight ironheart, my understanding is that was the example that came with the editor, Bunyon can decompile it back to compileable source, even then I have not been able to complete it, its a knightmare to untangle... (you can find knight ironheart in the if archive as well if your looking for it...)

all my knowledge of the editor etc is second hand that Ive picked up writing my interpreter + updating the compiler (its not the weiand editor). Do you have any info on the editor like a manual? there is a couple of gaps in the interpreter that nobody can explain but the manual might!! I never had a ti99, I dont recall if they made it to australia or not... email me if you have any info!! yakumo9275@gmail.com