Re: TI-H: TI-Modem
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Re: TI-H: TI-Modem
Did I say thats all you needed? First of all I wasn't intending you
connect the wires directly to the phone line, instead the AVR would act as
a software modem through the handest. If you've seen some of the WinModems
that operate through your soundcard, you know what I mean. btw, it works.
>Grant, that's the biggest load of crap I've heard on this list
>in a long time. You can't simply connect an ADC and DAC to a
>phone line and call it a modem. At the very least you'd need
>some kind of VFO and PLL to convert the tones back into a voltage at the
>other end. Not to mention that the two "modems" have to test
>line conditions and adjust baud rate, have some form of error
>correction, and so on. And then there is the issue of phone line
>voltage transients and all of that. Also, phone lines tend to
>shift frequencies occasionally so some kind of fuzzy logic
>wouldn't hurt either. There are commercial modem chips out
>there but I don't think any of them do above 2400 baud. You'd
>be better off learning how internal ISA modems work and picking
>up two el-cheapo internal 2400's at a computer show. Or..
>better yet... just use Biffle's TI TCP/IP redirector and a
>-=PC=-. Does anybody really want to play ztetris over the
>phone network anyway?
>
>Man, some of these projects are becoming absolutely insane. This
>isn't supposed to be a flame... but I wish for once you could
>post working plans to something without giving us a bunch of
>bullshit about clarisworks and how Linux crashed your
>computer. Certainly Clarisworks can save word documents for
>us PC guys and if you don't know how to use linux, there are
>plenty of good documentation sites on the net. Regardless, the
>original poster didn't ask for a hacker's solution, he wanted
>to know how to use the graphlink to connect his calculator to
>a modem. I believe there is info on ticalc.org about doing that.
>
>Bryan Rittmeyer
>mailto:bryanr@flash.net
>http://www.bridges.edu/horizon/
>
>Grant Stockly wrote:
>>
>> The thing I had just checks the calc transmit for activity and adc or
>> serial receive... Then decides what to do.
>>
>> >So, who all has successfully connected an external modem
>> >to their calc using the TI-Graphlink method, and connected to
>> >something? If so, tell what calc you used and what program
>> >please.
>> >
>> >Thanks!
>> >
>> >Lee