Keyboard-Problem (german) at remote-login

[Narr, McPaper]

once again the old story:

I figured out some more things about this nonworking keys
in dosemu (a/o/u-umlaut).
With setting rawkeyboard=1 the problems at the console
are gone.
But not the others...
After inspecting the active keymap ("keytable dump ..."),
I found that ALL characters >127 got away - this happens
on a remote (serial) line AND if I run dos in a xterm in
KDE. 
Without dos these both boxes behave absolutely correct.

How can I switch the dos-input to 8-bit?
Any ideas?

Greetings Wolfgang