That won't work. I don't remember where I read this, but I read that the system rom has calls for certain functions but they are just stubs. The rom only contains the stub of a call that says "open CRT: for writing" which just says go to some address and do whatever that address says. Normally that address just points to the address for the built-in routine to return the FC? error. But if dvi dos is installed then that address contains the address of the routine in dvi dos to actually do something.
Aha, here's where I read it. Start on page 257 https://archive.org/details/InsideTheTrs80Model100 I can try it when I get home but we already know. -- bkw
