> If someone could give me an idea how to proceed, I will be most > grateful. Either some explanation of how the modem connection process > could differ under linux and MacOS, or some advice for how to debug > what is happening without a working modem speaker.
For one, check if your init string is correct. It's also possible that MacOS d/l an upgraded firmware to the modem (check the version strings with ATI0, ATI1, etc... I suppose you have extracted the proper modem init string from MacOS connect script too ? The modem is just HW on a serial port, nothing special, except if the new pmac_zilog driver in 2.6 has a problem... Ben.
