Synchronous serial Re: E-Mail Formats RE: Future of cctalk/cctech

Wow, that's weird. Not that I know of. I did see something vaguely similar. Bell 202 modems are 1200 baud FSK, so on a voice channel they normally are 1200 bps half duplex. They can also be hooked up to 4-wire fixed circuits. But they have a reverse channel, good for 150 baud if I remember right. PLATO used that in its original terminal connections, in a slightly strange way: 1260 bps data to the terminal, and 126 bps data from terminal to host. The protocols are peculiar: terminal output is "synchronous", 21 bit frames at 60 frames per second, but each frame has a start bit (no stop bit). Data to the host is asynchronous, 1 start, 1 stop bit, 10 data bits. Since a 202 modem is just plain FSK, it doesn't matter that the data rate is not quite the standard 1200 bps. paul