Dale Botkin wrote:

>External modems are getting pretty pricey if bought new, last I checked.
>If you're using used modems, there are issues with getting enough the same
>make/model/rev level to respond predictably.  In my case, I find the app
>will most likely result in a bunch of different modem types, which means
>coming up with an init string for each one.  Plus you have an external
>device under its own power, doing its own thing...  the code required to
>do error detection and handling, try to reset the modem, etc is very
>expensive in terms of program memory.
>

I would think that pretty much everything you mentioned here pertains
to internal ISA/PCI modems, as well as external - except h.w. reset,
which could be done with a relay, and one power supply for both PIC and
modem.

So I guess in your project you're going towards full integration rather
than tapping a PC-internal job. Problem here of course, is modem chips/DAA
modules cost so much more than any kind of commodity PC jobs - esp to get
anything approaching 56 kpbs. Would be interesting to hear what you
finally decide on.

- danM

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