Aside from the checksum issue is there some reason you're using DOS Desklink? Laddiealpha has far more features and works on modern pcs and is supported. Same for mcomm.
As to TEENY maybe avoid TEENY.EXE on modern hardware though and just inject TEENY.DO If you really want to run teeny EXE or desklink on modern hardware and software you'll probably need to use an emulator. -- John.
