Thanks everybody for your tips. I know these mentinoed prog's, but both of them have disadvantages, mainly the limited speed and the fact, that they don't work with the good old batch-operations.
So I tried some more paramaters (in v 0.65) with disabled sound devices and the serial definition
serial1=directserial REALPORT:COM1 IRQ:4 STARTBPS:19200
So, with that parameter-set, I get the error-message
> serial port at 3f8: opening COM 1
> serial port at 3f8: write to reserved register, value 0x7, register 2
> serial port at 3f8: write to reserved register, value 0x0, register 2
> serial port at 3f8: write to reserved register, value 0x3, register 2
> ....
If I delete the REALPORT-Setting, I don't get the error-messages, but I still doesn't work.
The settings, for COM1, IRQ and 3F8 seem right to me, because with the same parameters TFWin and Total-Cmd are working.
Any more ideas around there ?