I have notebook computer with Win2000 SP4 and Agere Winmodem (v.8.3).
Dial-up on Internet works fine. Hyperterminal works fine. Term90 works OK.
But I have some older DOS applications (semigraphic emulator), and problems:

When I type AT commands to setup modem it gives me echo OK. On ATI11 it answered regulary.
But on any ATDTxxxxxxx it gives me ERROR. Modem doesnt go to call, at all (it works with hyperterm.). ATX3 doesnt help me (echo OK).

There is only MODE COM1:9600,N,8,1 as ini-file for my appl.
So, my modem understand commands for him, but can not goes out (ERROR without opening line).
Modem can see RING, when I call him.

When I use external modem, everything works correctly.

Any suggestion?