Jan Sedlak found a way to do this, and his code is included in Omniswp.
This means you don't have to run anything else than OmniSwp to get into
DOS mode. To install OmniSwp you
have to edit your autoexec.bat file on the OmniGo and rem out the
geos.bat statement. This is something that takes place if you install OGODOS
via the gpk installation tool.
Frits