Might be a serial_cs driver. Try to replace it with the one available for download at this site.
Thanks for the suggestion, Maslovsky... I looked at that but it looked too complicated for me, sorry. I have only a small amount of tie for hacking my Zaurus. I do appreciate your reply (and also the Cacko ROM, which is outstanding). Thanks.
I had a similar problem with Cacko ROM 1.21 / 1.21a on SL-C750 with a Pretec CompactModem 56k CF modem card
and solved it by removing the following line in \"/etc/pcmcia/serial\":
Hey... That is just about within my threshold. It looks like that fixed it - I will double check tomorrow. After commenting that line out, it gets as far as dialing the modem on the T610. Unfortunately there is no signal where I am but it looks very promising. Thank you very much, I was about to throw the phone into the junk drawer (I only bought it for that project, not really for talking).
I am very impressed, especially considering that was your first post :-). I only hope I can be as helpful to other people.
Regards, Ian.