Grumpy_Mike:
Well even if you have the modem part working a fax takes a lot of memory to hold the mage so that won't happen on an AT85.
But that handshaking is receiving something so your system would have to have the receive capabilities.
That is a lot simpler but you will need something at the computer end to act as a demodulator. Look at something like a radio ham's RTTY system, that is about as simple as it comes. RTTY from it:-
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I hadn't thought about the memory requirements on the ATTiny85 being a bottleneck for fax. Then again, I haven't researched the tech yet so if the data is too large then I guess that idea's out
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I understand the handshaking requires full duplex but I was just saying that the receiving part should be minimal. If receiving is impossible on the avr's hardware then it's indeed a problem but if it's just not very good, at least it doesn't have to happen for long...
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Aren't there programs like Bitware that will use the modem to pick up the phone, receive faxes, receive data, etc.? I assumed that as long as a modem exists, software can be used to make it pick up the phone and follow the AT commands it receives. I've got plenty of modems and computers to run them so this project is more useful if we assume that my home is always going to be the client and some remote location would be the host (via AVR + phone line).