> Yep, an external one. Toughest part is figuring out how to work with all
> the different way the modem can choose not to work, and detect and reset
> problems.  Not TOO tough, but can burn a lot of code space.

Naw, it's easy!  You need to set the S register in the modem so that it does
a reset when DTR is dropped.

michael brown

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