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each calculator would need to put themselves in receive then send mode back and forth, with the mode changing as soon as the other calculator received the new data
(...) Every z80 graphing calculator has a two-wire link port, that is, two signal lines and a ground. (...) Each line floats at 5v and can be pulled low by any calculator. If one calculator pulls a line low, it is pulled low for all calculators, and only when all calculators have released that line does it float high on every calculator. (...)
However, this doesn't stop the Prizm serial port from being used for other protocols, like SLIP ( https://en.wikipedia.org/wiki/Serial_Line_Internet_Protocol ) or its much more complex replacement PPP ( https://en.wikipedia.org/wiki/Point-to-Point_Protocol ), which I assume are similar to what Juju was trying to get working.
However isn't that "Sighs" remark kind of uncalled for? Just because it's easy for you to understand something this technical doesn't mean it's as easy for other people, you know?
Regarding using the serial port for PC-calculator or online communications, one important issue is that very few people are willing to spend extra money and deal with online stores to buy the required equipment to connect their calculator via the serial port to an USB port on the PC. So your audience would be much smaller than if you only required a standard USB cable that comes with every digital camera or calculator.
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