Ooops, the problem is worse than I thought. The 234 error occurs even using a 6309 version of NitrOS-9 with a misidentified program. I booted a 6309 Level2 nightly build and changed Dump to Obj6309. That resulted in a 234 error on a 6309 system. While dump does not contain any 6309 code, that should not be relevant. Robert