Ah, 75bps, fond memories for the French... the Minitel, our greatest achievement after the Concorde supersonic and the Mayonnaise...

To cut costs, those dumb terminals had an ADSL-like modem : 1200bps downstream, but only 75bps upstream (V23), just enough for sending keyboard entries to the server.

That ISA card modem I mentioned earlier... it was actually for a Minitel emulator on PCs. But as it was derived from a regular modem chip, with proper initialization it could be made to work in V22 mode, hence with regular BBSes...