Acoustic Coupled Modem

Just guessing here, but intelligent guessing :-) Cause the modem to issue the "ORIGINATE" tone rather than the ANSWER tone. Usage, dial the number you want to talk to, the other modem answers, you press connect and the modem squeals out 'Hiya cuties, how do you like these bits?' (although to humans it sounds more like a high pitched squeal). The other modem then answers with the ANSWER tone and you're off to the races. Sheesh, kids these days. Why when I was younger we used to have to whistle the Bell 212 standard for five minutes before they would even let us use the computer. :-) Seriously, yes there were acoustically coupled 1200 baud modems (I've got a couple of Racal-Vadics, considered "da-best" :-) but they weren't all that reliable. (hence all the error checking in the xmodem protocol) 1200 baud pushed manufacturers to include the _much_ more expensive "Data Access Arrangement" devices on the modem for direct connection. (This was one of the most amazing things about the original Hayes modem, it was direct connect and still pretty darn cheap.) If you want to keep it running your should buy a couple more yourself. The 212 model used active filters mounted on ceramic substrates that could (and did) fail. I don't believe they were repairable without surface mount gear. --Chuck