AT&T made a modem 60 years ago that the market absolutely refused to stop buying to this day. It's incredibly simple, and there's a good chance you've actually heard it's data format before.

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If you have a Bell 103capable modem, call this number for a special message: 509.569.7985
Set your serial port to TWO stop bits, not the usual one!

Please read my comment(s) below for some corrections (they don't fit in the description!)