I played around with a digital modem made by BG5ROJ and my first #CW QSO, and some #RTTY ones: https://www.youtube.com/watch?v=R6yT6Ib1Rz0
@DO2SGF not with the firmware that's on it now, it has PSK, RTTY and CW support. I believe the hardware has a lot more options, but then again it's not sold or made any more.