Re: TI-H: TI-Modem a reality
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Re: TI-H: TI-Modem a reality
Standard phone-lines are 12V, and when it rings, it's 90V. I believe
that the link port on the ti calcs uses 5V/0V for it's signals. So to
hook-up the 92 directly to a phone-line would require voltage regulators
and/or resistors. As for the protocols, I'm not sure how hard that
would be to program, but i'd imagine that it would just be easier to
find an old 9600 baud modem.
-mortis
Joe Martis wrote:
>
> I have figured out a way to make a modem type thing for the calculator,
> but it does not involve an evpensive modem. The way I see it is that the
> phone line uses two wires, right? The calc link uses two wires and a
> ground, right? I put two and two together and made a fuzzy picture. Slap
> the red to the red, white to the green and make some software to do the
> rest. To ground the calculator's cable you can just wrap it, if you have
> something better, try it. If the phone line is a diffrent voltage that
> the calculator we might have to do something about that (I don't know
> that much about this.) I find this relatively easy, excapt the software.
> It would use pulse dialing (unless if it can make more than one tone.)
> It must do protocoling. It must also do alot of other stuff. Since I
> don't know too much about this I'm leaving you guys to recearch it and
> develop it. Thanks for your time.
> -Joe Martis
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