Try using the old Serial Manager.  I used it for a magnetic stripe reader,
which basically just sucked in data (like a one way modem) and parsed it
as it came in.  It takes a lot of error handling, but it can be done and 
is backwards compatible.  However, Palm OS doesn't multithread like Windows,
so you should use a timeslice type management thing if you want the modem
to "appear" to be running in the background.

//* Rus Daniel Nesse 
//* Application Development
//* Avnet Convergent Technologies

>-----Original Message-----
>From: Tim Lock [mailto:[EMAIL PROTECTED]]
>Sent: Sunday, May 14, 2000 4:22 PM
>To: Palm Developer Forum
>Subject: Background Serial Handling
>
>
>Not have much luck find anything i can use in regard to writing a
>modem/background driver for Palm 3.5 and previous.
>
>I know about the New Serial Manager, but really hoping to get backwards
>compability.
>
>Your help would be much appecaited.
>
>Tim
>
>
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